Implantable medical device crosstalk evaluation and mitigation

Electrical crosstalk between two implantable medical devices or two different therapy modules of a common implantable medical device may be evaluated, and, in some examples, mitigated. In some examples, one of the implantable medical devices or therapy modules delivers electrical stimulation to a nonmyocardial tissue site or a nonvascular cardiac tissue site, and the other implantable medical device or therapy module delivers cardiac rhythm management therapy to a heart of the patient.

ISOLATION OF SENSING AND STIMULATION CIRCUITRY

The disclosure describes techniques of reducing or eliminating a commonality between two modules within the same implantable medical device. Each module within the implantable medical device provides therapy to a patient. The commonality between the two modules exists due to at least one common component shared by the two modules. The commonality between the two modules may create common-mode interference and a shunt current. In accordance with this disclosure, various isolation circuits located at various locations are disclosed to reduce or eliminate the commonality between the two modules. The reduction or elimination of the commonality between the two modules may reduce or eliminate common-mode interference and the shunt current.

TISSUE CONDUCTION COMMUNICATION USING RAMPED DRIVE SIGNAL

A device, such as an IMD, having a tissue conductance communication (TCC) transmitter controls a drive signal circuit and a polarity switching circuit by a controller of the TCC transmitter to generate an alternating current (AC) ramp on signal having a peak amplitude that is stepped up from a starting peak-to-peak amplitude to an ending peak-to-peak amplitude according to a step increment and step up interval. The TCC transmitter is further controlled to transmit the AC ramp on signal from the drive signal circuit and the polarity switching circuit via a coupling capacitor coupled to a transmitting electrode vector coupleable to the IMD. After the AC ramp on signal, the TCC transmitter transmits at least one TCC signal to a receiving device.

Foldable lens delivery system

An automatic lens delivery device using a linear actuator which is specially adapted for low torque, low heat applications, and can be used to insert a lens into a user's eye. The linear actuator uses two semiconductor devices which are moved one relative to the other. The movable device pushes a push rod that delivers a lens.

CLOSED LOOP POWER REGULATION FOR A TRANSCUTANEOUS ENERGY SYSTEM

A controller implantable within the body of a patient as part of a left ventricular assist device (LVAD) system and a method therefore are provided. According to one aspect, the controller includes processing circuitry configured to determine a voltage difference by determining a difference between a first voltage obtained from an internal coil of the controller and a target voltage, and is further configured to encode the voltage difference to produce an encoded voltage difference message. The internal coil is configured to transmit the encoded voltage difference message to a power transmitter to enable closed loop control of power transfer from the power transmitter to the controller to drive the voltage difference toward zero.

Low power wireless communication

Systems, devices, and techniques for establishing communication between two medical devices are described. In one example, an implantable medical device comprises communication circuitry, therapy delivery circuitry, and processing circuitry configured to initiate a communication window during which the implantable second medical device is capable of receiving the information related to a cardiac event detected by a first medical device, the communication window being one of a plurality of communication windows defined by a communication schedule that corresponds to a transmission schedule in which the first medical device is configured to transmit the information, control the communication circuitry to receive, from the first medical device, the information related to the cardiac event that is indicative of a timing of the cardiac event with respect to a timing of the communication window, schedule and control delivery of a therapy according to the information related to the cardiac event.

Implantable medical device crosstalk evaluation and mitigation

Electrical crosstalk between two implantable medical devices or two different therapy modules of a common implantable medical device may be evaluated, and, in some examples, mitigated. In some examples, one of the implantable medical devices or therapy modules delivers electrical stimulation to a nonmyocardial tissue site or a nonvascular cardiac tissue site, and the other implantable medical device or therapy module delivers cardiac rhythm management therapy to a heart of the patient.

ELECTRIC FIELD REJECTION OF A DUAL COIL TELEMETRY SYSTEM

An example telemetry system includes telemetry circuitry configured to communicate with a first device and being located on a circuit board. The telemetry system includes a first bobbin, the first bobbin being located on a first side of the circuit board. The telemetry system includes a first coil, the first coil being wound on the first bobbin in a first direction. The telemetry system includes a second bobbin, the second bobbin being located on a second side of the circuit board. The telemetry system includes a second coil, the second coil being wound on a second bobbin in a second direction, the second direction being opposite the first direction. An outer loop of the first coil and an outer loop of the second coil are electrically coupled together.

IMPLANTABLE MEDICAL DEVICE CROSSTALK EVALUATION AND MITIGATION

Electrical crosstalk between two implantable medical devices or two different therapy modules of a common implantable medical device may be evaluated, and, in some examples, mitigated. In some examples, one of the implantable medical devices or therapy modules delivers electrical stimulation to a nonmyocardial tissue site or a nonvascular cardiac tissue site, and the other implantable medical device or therapy module delivers cardiac rhythm management therapy to a heart of the patient.

Low power wireless communication

Systems, devices, and techniques for establishing communication between two medical devices are described. In one example, an implantable medical device comprises communication circuitry, therapy delivery circuitry, and processing circuitry configured to initiate a communication window during which the implantable second medical device is capable of receiving the information related to a cardiac event detected by a first medical device, the communication window being one of a plurality of communication windows defined by a communication schedule that corresponds to a transmission schedule in which the first medical device is configured to transmit the information, control the communication circuitry to receive, from the first medical device, the information related to the cardiac event that is indicative of a timing of the cardiac event with respect to a timing of the communication window, schedule and control delivery of a therapy according to the information related to the cardiac event.

EXTERNAL WIRELESS POWER TRANSFER COIL

An external coil system for a transcutaneous energy transfer system (TETS), the external coil being configured to transfer energy sufficient to power and implantable blood pump. The system includes a housing containing the external coil, the housing includes a thermal insulating base, the external coil being partially disposed within the thermal insulating base and a thermally conductive plastic, the external coil being partially disposed within the thermally conductive plastic.

Adaptive interference reduction during telemetry

An implantable medical device has a first module for performing telemetry communications with another device and a second module for delivering a high voltage therapy to a patient. The first module is configured to detect a communication error, and the second module is configured to determine a need for the therapy and to charge a capacitor in response to the need for the therapy. The second module is configured to suspend the capacitor charging in response to receiving a notification from the first module corresponding to detecting a communication error.

IMPLANTABLE MEDICAL DEVICE CROSSTALK EVALUATION AND MITIGATION

Electrical crosstalk between two implantable medical devices or two different therapy modules of a common implantable medical device may be evaluated, and, in some examples, mitigated. In some examples, one of the implantable medical devices or therapy modules delivers electrical stimulation to a nonmyocardial tissue site or a nonvascular cardiac tissue site, and the other implantable medical device or therapy module delivers cardiac rhythm management therapy to a heart of the patient.

DETECTING HEATING OF IMPLANTED COIL HERMETIC PACKAGE WHEN MISALIGNED

A method of monitoring heating of a hermetic package of an implanted transcutaneous energy transfer system (TETS) coil, the method includes monitoring a power transfer between the implanted TETS coil and an external TETS coil; detecting an amount of power lost during the power transfer; determining if the amount of power lost during the power transfer is above a first predetermined threshold; if the power lost is above the first predetermined threshold, determining if a misalignment between the implanted TETS coil and the external TETS coil is greater than a predetermined distance; and if the misalignment is greater than the predetermined distance, generating an alert to align the external TETS coil with the implanted TETS coil.

Integrity monitoring for a transcutaneous energy system

According to one or more embodiments, a system is provided. The system includes a power device implantable within a patient for powering an implantable medical device. The power device includes a first coil configured to receive wireless power signals for powering the implantable medical device and processing circuitry configured to determine at least one measurable electrical characteristic in a plurality of electrical pathways in the power device including an electrical pathway to the first coil, and detect reduced performance in receiving wireless power signals based at least in part on the determined at least one measurable electrical characteristic.

Telemetry extension cable

The invention of the disclosure is an extension cable to connect via telemetry, an external medical device in a non-sterile zone with a medical device that is within a sterile zone. The telemetry extension cable includes a cable having a length and comprising a conductor, a first RF antenna attached at one end of the cable and a second RF antenna attached at a second end of the cable, at least one of the first or second antennas configured to transmit and receive RF signals to and from an implantable medical device.

COMMUNICATION DIPOLE FOR IMPLANTABLE MEDICAL DEVICE

This disclosure is directed to an implantable medical device having a communication dipole configured in accordance with the techniques described herein. In one example, the disclosure is directed to an implantable medical device comprising a housing that encloses at least a communication module, a first electrode of a communication dipole electrically coupled to the communication module and an electrically conductive fixation mechanism that is electrically coupled to a portion of the housing and wherein a portion of the fixation mechanism is configured to function as at least part of a second electrode of the communication dipole. The electrically conductive fixation mechanism includes a dielectric material that covers at least part of a surface of the fixation mechanism. The communication module is configured to transmit or receive a modulated signal between the first electrode and second electrode of the communication dipole. 1. An implantable medical device comprising:a housing that encloses at least a communication module;a first electrode of a communication dipole electrically coupled to the communication module; andan electrically conductive fixation mechanism that is electrically coupled to a portion of the housing and that includes a dielectric material that covers at least part of a surface of the fixation mechanism,wherein a portion of the fixation mechanism is configured to function as at least part of a second electrode of the communication dipole, andwherein the communication module is configured to transmit or receive a modulated signal between the first electrode and second electrode of the communication dipole.2. The implantable medical device of claim 1 , wherein the portion of the electrically conductive fixation mechanism that is configured to function as at least part of the second electrode is not covered by the dielectric material.3. The implantable medical device of claim 1 , wherein a portion of the housing not electrically coupled to the ...

ESTABLISHING A SECURE COMMUNICATION LINK

This disclosure is directed to devices, systems, and techniques for establishing a secure connection between two or more devices. In some examples, a device is configured for wireless communication. The device comprises signal reception circuitry configured to receive communications transmitted according to at least a first communication protocol, communication circuitry configured for wireless communication according to at least a second communication protocol, and processing circuitry electrically coupled to the signal reception circuitry and the communication circuitry. The processing circuitry is configured to receive, via the signal reception circuitry, a first signal according to the first communication protocol. In response to receiving the first signal, the processing circuitry is further configured to transmit, via the communication circuitry, a second signal according to the second communication protocol and establish a secure link according to the second communication protocol. 1. A first device configured for wireless communication , wherein the first device comprises:signal reception circuitry configured to receive communications transmitted according to at least a first communication protocol;communication circuitry configured for wireless communication according to at least a second communication protocol; and receive, via the signal reception circuitry, a first signal according to the first communication protocol;', 'in response to receiving the first signal, transmit, via the communication circuitry, a second signal according to the second communication protocol; and', 'establish a secure link according to the second communication protocol, wherein to establish the secure link, the processing circuitry is configured to transmit at least one signal at a first power magnitude, and wherein communications transmitted over the secure link are at a second power magnitude greater than the first power magnitude., 'processing circuitry electrically coupled ...

Implantable medical device crosstalk evaluation and mitigation

Electrical crosstalk between two implantable medical devices or two different therapy modules of a common implantable medical device may be evaluated, and, in some examples, mitigated. In some examples, one of the implantable medical devices or therapy modules delivers electrical stimulation to a nonmyocardial tissue site or a nonvascular cardiac tissue site, and the other implantable medical device or therapy module delivers cardiac rhythm management therapy to a heart of the patient.

Digitally timed CMOS rectifier for wireless power transfer

A digitally timed complementary metal oxide semiconductor (CMOS) rectifier for wireless power transfer in an implanted medical device is provided. According to one aspect, a voltage rectification circuit for a medical device having an internal coil and internal circuitry includes a voltage rectifier comprising a complementary metal oxide semiconductor (CMOS) circuit having low-side first type MOS transistors and upper cross-coupled second type MOS transistors. The voltage rectifier may be configured to output a rectified received voltage, each low-side first type MOS transistor being configured with an first type MOS body diode, the low-side first type MOS transistors being enabled by a timing signal to provide conduction through the low-side first type MOS transistors while bypassing conduction through the first type MOS body diode during a time window having a duration determined by voltage level crossings of the received voltage.

METHOD FOR POWER MONITORING AND DYNAMICALLY MANAGING POWER IN A FULLY IMPLANTED LVAD SYSTEM

In an implanted medical device system, an internal controller, external power transmitter and methods for monitoring and dynamically managing power in an implanted medical device system are disclosed. According to one aspect, an internal controller is configured to provide power to a motor of an implanted medical device, the power being drawn from at least one of an internal battery and an internal coil, the at least one of the internal battery and the internal coil providing a supplied voltage. The internal controller includes processing circuitry configured to switch to one of the internal battery, the internal coil and a combination of the internal battery and the internal coil, based on a comparison of the supplied voltage to a threshold.

Power source selection for a fully implantable LVAD system

A method of managing multiple power sources for an implantable blood pump includes operating the implantable blood pump with both power from an internal battery, the internal battery being disposed within an implantable controller and in communication with the implantable blood pump, and with transcutaneous energy transfer system (TETS) power in communication with the implantable blood pump, if TETS power is available.

THERAPY MODULE CROSSTALK MITIGATION

A first implantable medical device (IMD) implanted within a patient may communicate with a second IMD implanted within the patient by encoding information in an electrical stimulation signal. The delivery of the electrical stimulation signal may provide therapeutic benefits to the patient. The second IMD may sense the electrical stimulation signal, which may be presented as an artifact in a sensed cardiac signal, and process the sensed signal to retrieve the encoded information. The second IMD may modify its operation based on the received therapy information. Crosstalk between the first and second IMDs may be reduced using various techniques described herein. For example, the first IMD may generate the electrical stimulation signal to include a spread spectrum energy distribution or a predetermined signal signature. The second IMD may effectively remove a least some of the signal artifact in a sensed cardiac signal based on the predetermined signal signature.

Facilitating acceleration of advertising rates for medical devices

Techniques for facilitating communication between an implantable medical device and an external device are provided. In one example, a method comprises broadcasting, via communication circuitry of an implantable device, a first set of advertisements at a first advertising rate according to a communication protocol. The method further comprises determining that detection circuitry of the implantable device detected voltage induced by an electromagnetic field at an interface between tissue of a patient and electrodes of the implantable device and in response to the detection of voltage induced by the electromagnetic field, broadcasting, via the communication circuitry, a second set of advertisements at a second advertising rate according to the communication protocol. The second advertising rate is greater than the first advertising rate.

ALIGNMENT GARMENT FOR USE WITH A FULLY IMPLANTABLE SYSTEM

An alignment garment for holding an external coil in a predetermined location. The alignment garment may comprise an attachment mechanism for holding the external coil in the predetermined location. The alignment garment may also have a plurality of straps with a first strap in the plurality of straps being secured to the attachment mechanism and a second strap of the plurality of straps being secured to the attachment mechanism.

Tissue conduction communication between devices

A system, such as an IMD system, includes a tissue conductance communication (TCC) transmitter configured to generate a beacon signal by generating a carrier signal and modulating a first property of the carrier signal according to a first type of modulation. The TCC transmitter is configured to generate a data signal subsequent to the beacon signal by generating the carrier signal and modulating a second property of the carrier signal different than the first property according to a second type of modulation different than the first type of modulation.

Communication dipole for implantable medical device

This disclosure is directed to an implantable medical device having a communication dipole configured in accordance with the techniques described herein. In one example, the disclosure is directed to an implantable medical device comprising a housing that encloses at least a communication module, a first electrode of a communication dipole electrically coupled to the communication module and an electrically conductive fixation mechanism that is electrically coupled to a portion of the housing and wherein a portion of the fixation mechanism is configured to function as at least part of a second electrode of the communication dipole. The electrically conductive fixation mechanism includes a dielectric material that covers at least part of a surface of the fixation mechanism. The communication module is configured to transmit or receive a modulated signal between the first electrode and second electrode of the communication dipole.

Adaptive Interference Reduction During Telemetry

An implantable medical device has a first module for performing telemetry communications with another device and a second module for delivering a high voltage therapy to a patient. The first module is configured to detect a communication error, and the second module is configured to determine a need for the therapy and to charge a capacitor in response to the need for the therapy. The second module is configured to suspend the capacitor charging in response to receiving a notification from the first module corresponding to detecting a communication error.

METHOD FOR ADJUSTING THE RATE OF "SEARCHING PULSES" IN A TETS SYSTEM

In an implanted medical device system, an external power transmitter and methods for adjusting a rate of search pulse transmission by an external power transmitter of an implanted medical device system are disclosed. According to one aspect, a method includes detecting a condition of the external power transmitter, and selecting among rates of transmission of search pulses based on the detected condition.

Implantable medical device crosstalk evaluation and mitigation

Electrical crosstalk between two implantable medical devices or two different therapy modules of a common implantable medical device may be evaluated, and, in some examples, mitigated. In some examples, one of the implantable medical devices or therapy modules delivers electrical stimulation to a nonmyocardial tissue site or a nonvascular cardiac tissue site, and the other implantable medical device or therapy module delivers cardiac rhythm management therapy to a heart of the patient.

Implantable medical device with dual-use communication module

An implantable medical device comprises a communication module that comprises at least one of a receiver module and a transmitter module. The receiver module is configured to both receive from an antenna and demodulate an RF telemetry signal, and receive from a plurality of electrodes and demodulate a tissue conduction communication (TCC) signal. The transmitter module is configured to modulate and transmit both an RF telemetry signal via the antenna and a TCC signal via the plurality of electrodes. The RF telemetry signal and the TCC signal are both within a predetermined band for RF telemetry communication. In some examples, the IMD comprises a switching module configured to selectively couple one of the plurality of electrodes and the antenna to the receiver module or transmitter module.

Disabling an implanted medical device with another medical device

Various techniques for disabling a first implantable medical device (IMD) by modulation of therapeutic electrical stimulation delivered by a second medical device are described. One example method includes delivering therapeutic electrical stimulation from a more recently implanted second IMD at a higher average rate than the previously implanted first IMD so that only the more recently implanted IMD will administer therapy, and modulating stimulation by the more recently implanted IMD in order to send a disable command to the previously implanted IMD.

IMPLANTABLE MEDICAL DEVICE CROSSTALK EVALUATION AND MITIGATION

Electrical crosstalk between two implantable medical devices or two different therapy modules of a common implantable medical device may be evaluated, and, in some examples, mitigated. In some examples, one of the implantable medical devices or therapy modules delivers electrical stimulation to a nonmyocardial tissue site or a nonvascular cardiac tissue site, and the other implantable medical device or therapy module delivers cardiac rhythm management therapy to a heart of the patient.

FACILITATING ACCELERATION OF ADVERTISING RATES FOR MEDICAL DEVICES

Techniques for facilitating communication between an implantable medical device and an external device are provided. In one example, a method comprises broadcasting, via communication circuitry of an implantable device, a first set of advertisements at a first advertising rate according to a communication protocol. The method further comprises determining that detection circuitry of the implantable device detected voltage induced by an electromagnetic field at an interface between tissue of a patient and electrodes of the implantable device and in response to the detection of voltage induced by the electromagnetic field, broadcasting, via the communication circuitry, a second set of advertisements at a second advertising rate according to the communication protocol. The second advertising rate is greater than the first advertising rate.

Managing the electric field exposure in a fully implanted LVAD system

An external power transmitter of an implanted medical device system such as a left ventricular assist device (LVAD) system and a method therefore are provided. According to one aspect, a method includes transitioning from applying a first external coil current limit to applying a second external coil current limit to limit current of an external coil coupled to the external power transmitter, the transitioning being based on at least one of an intent to enter a free mode of operation of the implanted medical device system, an existence of an alarm condition, and an existence of transcutaneous energy transfer system (TETS) power transfer.

Implantable medical device crosstalk evaluation and mitigation

Electrical crosstalk between two implantable medical devices or two different therapy modules of a common implantable medical device may be evaluated, and, in some examples, mitigated. In some examples, one of the implantable medical devices or therapy modules delivers electrical stimulation to a nonmyocardial tissue site or a nonvascular cardiac tissue site, and the other implantable medical device or therapy module delivers cardiac rhythm management therapy to a heart of the patient.

Isolation of sensing and stimulation circuitry

The disclosure describes techniques of reducing or eliminating a commonality between two modules within the same implantable medical device. Each module within the implantable medical device provides therapy to a patient. The commonality between the two modules exists due to at least one common component shared by the two modules. The commonality between the two modules may create common-mode interference and a shunt current. In accordance with this disclosure, various isolation circuits located at various locations are disclosed to reduce or eliminate the commonality between the two modules. The reduction or elimination of the commonality between the two modules may reduce or eliminate common-mode interference and the shunt current.

Method for regulating TETS power transfer

In an implanted medical device system, an internal controller, external power transmitter and methods for regulation of TETS power for an implanted medical device system are disclosed. According to one aspect, a method in an external power transmitter of an implanted medical device system includes determining a current in an external coil of the external power transmitter, multiplying the determined current by a supply voltage to determine a power delivered to the external coil, and controlling the power delivered to the external coil by adjusting the current in the external coil.

IMPLANTABLE MEDICAL DEVICE CROSSTALK EVALUATION AND MITIGATION

Electrical crosstalk between two implantable medical devices or two different therapy modules of a common implantable medical device may be evaluated, and, in some examples, mitigated. In some examples, one of the implantable medical devices or therapy modules delivers electrical stimulation to a nonmyocardial tissue site or a nonvascular cardiac tissue site, and the other implantable medical device or therapy module delivers cardiac rhythm management therapy to a heart of the patient.

IMPLANTABLE MEDICAL DEVICE CROSSTALK EVALUATION AND MITIGATION

Electrical crosstalk between two implantable medical devices or two different therapy modules of a common implantable medical device may be evaluated, and, in some examples, mitigated. In some examples, one of the implantable medical devices or therapy modules delivers electrical stimulation to a nonmyocardial tissue site or a nonvascular cardiac tissue site, and the other implantable medical device or therapy module delivers cardiac rhythm management therapy to a heart of the patient.

ISOLATION OF SENSING AND STIMULATION CIRCUITRY

The disclosure describes techniques of reducing or eliminating a commonality between two modules within the same implantable medical device. Each module within the implantable medical device provides therapy to a patient. The commonality between the two modules exists due to at least one common component shared by the two modules. The commonality between the two modules may create common-mode interference and a shunt current. In accordance with this disclosure, various isolation circuits located at various locations are disclosed to reduce or eliminate the commonality between the two modules. The reduction or elimination of the commonality between the two modules may reduce or eliminate common-mode interference and the shunt current.

INTERFERENCE MITIGATION FOR IMPLANTABLE DEVICE RECHARGING

A therapy or monitoring system may implement one or more techniques to mitigate interference between operation of a charging device that charges a first implantable medical device (IMD) implanted in a patient and a second IMD implanted in the patient. In some examples, the techniques may include modifying an operating parameter of the charging device in response to receiving an indication that a second IMD is implanted in the patient. The techniques also may include modifying an operating parameter of the second IMD in response to detecting the presence or operation of the charging device.

IMPLANTABLE MEDICAL DEVICE CROSSTALK EVALUATION AND MITIGATION

Electrical crosstalk between two implantable medical devices or two different therapy modules of a common implantable medical device may be evaluated, and, in some examples, mitigated. In some examples, one of the implantable medical devices or therapy modules delivers electrical stimulation to a nonmyocardial tissue site or a nonvascular cardiac tissue site, and the other implantable medical device or therapy module delivers cardiac rhythm management therapy to a heart of the patient.

FACILITATING ACCELERATION OF ADVERTISING RATES FOR MEDICAL DEVICES

Techniques for facilitating communication between an implantable medical device and an external device are provided. In one example, a method comprises broadcasting, via communication circuitry of an implantable device, a first set of advertisements at a first advertising rate according to a communication protocol. The method further comprises determining that detection circuitry of the implantable device detected voltage induced by an electromagnetic field at an interface between tissue of a patient and electrodes of the implantable device and in response to the detection of voltage induced by the electromagnetic field, broadcasting, via the communication circuitry, a second set of advertisements at a second advertising rate according to the communication protocol. The second advertising rate is greater than the first advertising rate. 1. An implantable device , comprising:a plurality of electrodes;detection circuitry electrically coupled to the electrodes, the detection circuitry configured to detect voltage induced by an electromagnetic field at an interface between tissue of a patient and the electrodes of the implantable device;communication circuitry configured for wireless communication according to a communication protocol; and broadcast, via the communication circuitry, a first set of advertisements at a first advertising rate according to the communication protocol;', 'determine that the detection circuitry detected voltage induced by the electromagnetic field; and', 'in response to the detection of voltage induced by the electromagnetic field, broadcast, via the communication circuitry, a second set of advertisements at a second advertising rate according to the communication protocol, wherein the second advertising rate is greater than the first advertising rate., 'processing circuitry electrically coupled to the detection circuitry and the communication circuitry, wherein the processing circuitry is configured to2. The implantable device of claim 1 , ...

ALIGNMENT GARMENT FOR USE WITH A FULLY IMPLANTABLE SYSTEM

An alignment vest for holding an external coil in a predetermined location. The alignment vest may comprise at least one attachment mechanism for holding the external coil in the predetermined location. The alignment vest may also comprise a panel having a fastening mechanism and a plurality of straps, the front panel being secured to at least one of the plurality of straps.

LOW POWER WIRELESS COMMUNICATION

Systems, devices, and techniques for establishing communication between two medical devices are described. In one example, an implantable medical device comprises communication circuitry, therapy delivery circuitry, and processing circuitry configured to initiate a communication window during which the implantable second medical device is capable of receiving the information related to a cardiac event detected by a first medical device, the communication window being one of a plurality of communication windows defined by a communication schedule that corresponds to a transmission schedule in which the first medical device is configured to transmit the information, control the communication circuitry to receive, from the first medical device, the information related to the cardiac event that is indicative of a timing of the cardiac event with respect to a timing of the communication window, schedule and control delivery of a therapy according to the information related to the cardiac event. 1. A method comprising:initiating, by an implantable medical device, a communication window during which the implantable medical device is capable of receiving information related to a cardiac event from another medical device, the communication window being one communication window of a plurality of communication windows defined by a communication schedule that corresponds to a transmission schedule defining a plurality of transmission windows in which the another medical device is configured to transmit the information related to the cardiac event, wherein the implantable medical device is not capable of receiving the information related to the cardiac event between the plurality of communication windows;receiving, by the implantable medical device and from the another medical device during the communication window, the information related to the cardiac event that is indicative of a timing of the cardiac event with respect to a timing of the communication window;scheduling, by ...

Method of detecting presence of implanted power transfer coil

A method and apparatus related to detecting the presence of a power transfer coil implanted in a patient are disclosed. According to the aspect, an external device of a medical implant system is provided, the external device having an external coil and processing circuitry. The processing circuitry is configured to monitor a resonance frequency associated with the external coil. When the resonance frequency changes as a distance between the external coil and an expected location of an internal coil, then the processing circuitry is configured to conclude that the internal coil has been detected. When the resonance frequency ramps up to a steady state value at a rate that falls below a rate threshold, then the processing circuitry is configured to conclude that the internal coil is connected to an internal load.

IMPLANTABLE MEDICAL DEVICE CROSSTALK EVALUATION AND MITIGATION

Electrical crosstalk between two implantable medical devices or two different therapy modules of a common implantable medical device may be evaluated, and, in some examples, mitigated. In some examples, one of the implantable medical devices or therapy modules delivers electrical stimulation to a nonmyocardial tissue site or a nonvascular cardiac tissue site, and the other implantable medical device or therapy module delivers cardiac rhythm management therapy to a heart of the patient.

Implantable medical device crosstalk evaluation and mitigation

Electrical crosstalk between two implantable medical devices or two different therapy modules of a common implantable medical device may be evaluated, and, in some examples, mitigated. In some examples, one of the implantable medical devices or therapy modules delivers electrical stimulation to a nonmyocardial tissue site or a nonvascular cardiac tissue site, and the other implantable medical device or therapy module delivers cardiac rhythm management therapy to a heart of the patient.

Tissue conduction communication using ramped drive signal

A device, such as an IMD, having a tissue conductance communication (TCC) transmitter controls a drive signal circuit and a polarity switching circuit by a controller of the TCC transmitter to generate an alternating current (AC) ramp on signal having a peak amplitude that is stepped up from a starting peak-to-peak amplitude to an ending peak-to-peak amplitude according to a step increment and step up interval. The TCC transmitter is further controlled to transmit the AC ramp on signal from the drive signal circuit and the polarity switching circuit via a coupling capacitor coupled to a transmitting electrode vector coupleable to the IMD. After the AC ramp on signal, the TCC transmitter transmits at least one TCC signal to a receiving device.

Method of detecting presence of implanted power transfer coil

A method and apparatus related to detecting the presence of a power transfer coil implanted in a patient are disclosed. According to the aspect, an external device of a medical implant system is provided, the external device having an external coil and processing circuitry. The processing circuitry is configured to monitor a resonance frequency associated with the external coil. When the resonance frequency changes as a distance between the external coil and an expected location of an internal coil, then the processing circuitry is configured to conclude that the internal coil has been detected. When the resonance frequency ramps up to a steady state value at a rate that falls below a rate threshold, then the processing circuitry is configured to conclude that the internal coil is connected to an internal load.

Controlling noise sources during telemetry

The invention presents techniques for reducing the interference to telemetry from an implanted medical device caused by a source of controllable noise. In the context of an implanted system that includes a defibrillator system and a telemetry system, for example, the invention reduces the interference by suspending energy storage during telemetry. The invention further provides for suspending energy storage operation gradually rather than abruptly, by gradually reducing the duty cycle of a clock that controls the energy storage.

Therapy module crosstalk mitigation

A first implantable medical device (IMD) implanted within a patient may communicate with a second IMD implanted within the patient by encoding information in an electrical stimulation signal. The delivery of the electrical stimulation signal may provide therapeutic benefits to the patient. The second IMD may sense the electrical stimulation signal, which may be presented as an artifact in a sensed cardiac signal, and process the sensed signal to retrieve the encoded information. The second IMD may modify its operation based on the received therapy information. Crosstalk between the first and second IMDs may be reduced using various techniques described herein. For example, the first IMD may generate the electrical stimulation signal to include a spread spectrum energy distribution or a predetermined signal signature. The second IMD may effectively remove a least some of the signal artifact in a sensed cardiac signal based on the predetermined signal signature.

IMPLANTABLE MEDICAL DEVICE INCLUDING EXTRAVASCULAR CARDIAC STIMULATION AND NEUROSTIMULATION CAPABILITIES

An implantable medical device may deliver pacing, cardioversion, and/or defibrillation stimulation to a heart of a patient via extravascular electrodes and delivers electrical stimulation to a nonmyocardial tissue site to modulate the autonomic nervous system of the patient. The implantable medical device may include a cardiac therapy module that generates and delivers at least one of pacing, cardioversion, or defibrillation therapy to a patient via an extravascular electrode, and a neurostimulation therapy module that generates and delivers a neurostimulation signal to the patient via a neurostimulation electrode. The cardiac therapy module and neurostimulation therapy module may be disposed in a common housing of the medical device. In some examples, at least one common lead may electrically couple the neurostimulation electrode and the extravascular electrode to the neurostimulation and cardiac therapy modules, respectively.

Interference mitigation for implantable device recharging

A therapy or monitoring system may implement one or more techniques to mitigate interference between operation of a charging device that charges a first implantable medical device (IMD) implanted in a patient and a second IMD implanted in the patient. In some examples, the techniques may include modifying an operating parameter of the charging device in response to receiving an indication that a second IMD is implanted in the patient. The techniques also may include modifying an operating parameter of the second IMD in response to detecting the presence or operation of the charging device.

Signal transmission optimization for tissue conduction communication

A device includes a tissue conduction communication (TCC) transmitter that generates a TCC signal including a carrier signal having a peak-to-peak amplitude and a carrier frequency cycle length including a first polarity pulse for a first half of the carrier frequency cycle length and a second polarity pulse opposite the first polarity pulse for a second half of the carrier frequency cycle length. Each of the first polarity pulse and the second polarity pulse inject a half cycle charge into a TCC pathway. The TCC transmitter starts transmitting the TCC signal with a starting pulse having a net charge that is half of the half cycle charge and transmits alternating polarity pulses of the carrier signal consecutively following the starting pulse.

COMMUNICATION BETWEEN IMPLANTABLE MEDICAL DEVICES

A first implantable medical device (IMD) implanted within a patient may communicate with a second IMD implanted within the patient by encoding information in an electrical stimulation signal. The delivery of the electrical stimulation signal may provide therapeutic benefits to the patient. The second IMD may sense the electrical stimulation signal, which may be presented as an artifact in a sensed cardiac signal, and process the sensed signal to retrieve the encoded information. The second IMD may modify its operation based on the received therapy information. Crosstalk between the first and second IMDs may be reduced using various techniques described herein. For example, the first IMD may generate the electrical stimulation signal to include a spread spectrum energy distribution or a predetermined signal signature. The second IMD may effectively remove a least some of the signal artifact in a sensed cardiac signal based on the predetermined signal signature.

TELEMETRY EXTENSION CABLE

The invention of the disclosure is an extension cable to connect via telemetry, an external medical device in a non-sterile zone with a medical device that is within a sterile zone. The telemetry extension cable includes a cable having a length and comprising a conductor, a first RF antenna attached at one end of the cable and a second RF antenna attached at a second end of the cable, at least one of the first or second antennas configured to transmit and receive RF signals to and from an implantable medical device. 1. A telemetry extension cable comprising:a cable having a length and comprising a conductor;a first RF antenna attached at one end of the cable; anda second RF antenna attached at a second end of the cable, at least one of the first or second antennas configured to transmit and receive RF signals to and from an implantable medical device.2. The telemetry extension cable of wherein each of the first and second RF antennae comprises a coil of a conductor.3. The telemetry extension cable of wherein each of the first and second RF antennae comprises an array of coiled conductors.4. The telemetry extension cable of wherein one of the first or the second telemetry head further comprises a magnet.5. The telemetry extension cable of wherein each of the first and second RF antennae are substantially planar.6. The telemetry extension cable of wherein each of the first and second RF antennae are in the form of a substantially planar disc.7. The telemetry extension cable of wherein the cable and each of the first and second antennae further comprise a coating of a polymer material capable of being sterilized.8. The telemetry extension cable of further comprising a pair of cable connectors along the cable claim 1 , each cable connector defining an end of a portion of cable claim 1 , the pair of cable connectors adapted to releasably connect the cable portions.9. A system for connecting an external medical device to an implantable medical device comprising:an ...

Device and method to reduce artifact from tissue conduction communication transmission

A device is configured to transmit tissue conductance communication (TCC) signals by generating multiple TCC signals by a TCC transmitter of the IMD. The generated TCC signals are coupled to a transmitting electrode vector via a coupling capacitor to transmit the plurality of TCC signals to a receiving medical device via a conductive tissue pathway. A voltage holding circuit holds the coupling capacitor at a DC voltage for a time interval between two consecutively transmitted TCC signals.

Method for adjusting the rate of “searching pulses” in a TETS system

In an implanted medical device system, an external power transmitter and methods for adjusting a rate of search pulse transmission by an external power transmitter of an implanted medical device system are disclosed. According to one aspect, a method includes detecting a condition of the external power transmitter, and selecting among rates of transmission of search pulses based on the detected condition.

LOW POWER WIRELESS COMMUNICATION

Systems, devices, and techniques for establishing communication between two medical devices are described. In one example, an implantable medical device comprises communication circuitry, therapy delivery circuitry, and processing circuitry configured to initiate a communication window during which the implantable second medical device is capable of receiving the information related to a cardiac event detected by a first medical device, the communication window being one of a plurality of communication windows defined by a communication schedule that corresponds to a transmission schedule in which the first medical device is configured to transmit the information, control the communication circuitry to receive, from the first medical device, the information related to the cardiac event that is indicative of a timing of the cardiac event with respect to a timing of the communication window, schedule and control delivery of a therapy according to the information related to the cardiac event. 1. A method comprising:detecting, by a first medical device, a cardiac event of a patient;determining, by the first medical device, a timing of a transmission window, the transmission window being one transmission window of a plurality of transmission windows defined by a transmission schedule;generating, by the first medical device and based on a timing of the cardiac event with respect to the timing of the transmission window, information related to the cardiac event; andtransmitting, by the first medical device and during the transmission window defined by the transmission schedule, the information related to the cardiac event to an implantable second medical device that is distinct from the first medical device.2. The method of claim 1 , wherein: determining, by the first medical device and based on the detected cardiac event, a timing for delivery of a therapy by the implantable second medical device, and', 'generating, by the first medical device and based on the timing for ...

ACCELEROMETER FEEDBACK CONTROL LOOP FOR PATIENT ALERT

A system and associated method for alerting a patient of a condition detected by an implanted medical device by delivering an alert signal to cause a motion within the patient's body in response to detecting the condition. An accelerometer signal is measured during the alert signal delivery. Accelerometer signal measurements are compared to a threshold. A parameter controlling the alert signal is adjusted to maintain the accelerometer signal within a range of the threshold. 1. A method for alerting a patient of a condition detected by an implanted medical device , comprising:delivering an alert signal to cause a motion within the patient's body in response to detecting the condition;measuring an accelerometer signal during the alert signal delivery;comparing the accelerometer signal measurement to a threshold; andadjusting a parameter controlling the alert signal to maintain the accelerometer signal within a range of the threshold.2. The method of claim 1 , wherein delivering the alert signal comprises delivering a plurality of electrical stimulation pulses using an electrode pair for stimulating excitable tissue.3. The method of claim 1 , wherein delivering the alert signal comprises causing a mechanical vibration.4. The method of claim 2 , wherein adjusting the parameter comprises adjusting one of a stimulation pulse amplitude claim 2 , a pulse number claim 2 , a pulse frequency claim 2 , an alert signal duration claim 2 , an electrode delivering the plurality of stimulation pulses claim 2 , an electrode polarity claim 2 , and a pattern of the plurality of stimulation pulses.5. The method of claim 1 , wherein measuring the accelerometer signal comprises measuring one of a signal magnitude and a signal frequency.6. The method of claim 1 , wherein measuring the accelerometer signal comprises measuring a morphology of the accelerometer signal claim 1 , and wherein the threshold range comprises a waveform morphology corresponding to an alert signal pattern.7. The ...

MANAGING THE ELECTRIC FIELD EXPOSURE IN A FULLY IMPLANTED LVAD SYSTEM

An external power transmitter of an implanted medical device system such as a left ventricular assist device (LVAD) system and a method therefore are provided. According to one aspect, a method includes transitioning from applying a first external coil current limit to applying a second external coil current limit to limit current of an external coil coupled to the external power transmitter, the transitioning being based on at least one of an intent to enter a free mode of operation of the implanted medical device system, an existence of an alarm condition, and an existence of transcutaneous energy transfer system (TETS) power transfer.

IMPLANTABLE MEDICAL DEVICE CROSSTALK EVALUATION AND MITIGATION

Electrical crosstalk between two implantable medical devices or two different therapy modules of a common implantable medical device may be evaluated, and, in some examples, mitigated. In some examples, one of the implantable medical devices or therapy modules delivers electrical stimulation to a nonmyocardial tissue site or a nonvascular cardiac tissue site, and the other implantable medical device or therapy module delivers cardiac rhythm management therapy to a heart of the patient.

Implantable medical device crosstalk evaluation and mitigation

Electrical crosstalk between two implantable medical devices or two different therapy modules of a common implantable medical device may be evaluated, and, in some examples, mitigated. In some examples, one of the implantable medical devices or therapy modules delivers electrical stimulation to a nonmyocardial tissue site or a nonvascular cardiac tissue site, and the other implantable medical device or therapy module delivers cardiac rhythm management therapy to a heart of the patient.

ATTACHMENT MECHANISM FOR ALIGNMENT GARMENT FOR USE WITH A FULLY IMPLANTABLE SYSTEM

An attachment mechanism securable to a garment for holding an external coil in a predetermined location, the attachment mechanism comprising: a body with a plurality of protrusions, the plurality of protrusions configured to be received within an aperture of the external coil; and an anchoring element configured to be secured to the garment to secure the external coil to the garment.

COIL SHUNTING FOR VOLTAGE LIMITING OF INDUCTIVELY TRANSFERRED POWER

An internal controller and an external power transmitter of an implanted medical device system and method therefore are provided. According to one aspect, an external power transmitter as part of a implanted medical device system includes processing circuitry configured to detect a shunting condition of an internal coil of the implanted medical device system, and responsive to detecting a shunting condition, reduce a magnitude of power transmitted to the internal coil.

IMPLANTABLE MEDICAL DEVICE CROSSTALK EVALUATION AND MITIGATION

Electrical crosstalk between two implantable medical devices or two different therapy modules of a common implantable medical device may be evaluated, and, in some examples, mitigated. In some examples, one of the implantable medical devices or therapy modules delivers electrical stimulation to a nonmyocardial tissue site or a nonvascular cardiac tissue site, and the other implantable medical device or therapy module delivers cardiac rhythm management therapy to a heart of the patient.

IMPLANTABLE MEDICAL DEVICE INCLUDING CABLE FASTENER

Various embodiments of an implantable medical device and a method of implanting such device are disclosed. The device includes a housing having a first major surface, a second major surface, a sidewall that extends between the first major surface and the second major surface, and a port disposed in the sidewall. The sidewall defines a perimeter of the housing. The device further includes an electronic component disposed within the housing, and a cable electrically connected to the electronic component disposed within the housing, where the cable extends through the port. A portion of the cable is adapted to be removably connected to the housing adjacent an outer surface of the sidewall by a fastener such that the portion of the cable extends along at least a portion of the perimeter of the housing when the portion of the cable is removably connected to the housing. 1. An implantable medical device comprising:a housing comprising a first major surface, a second major surface, a sidewall that extends between the first major surface and the second major surface, and a port disposed in the sidewall, wherein the sidewall defines a perimeter of the housing;an electronic component disposed within the housing; anda cable electrically connected to the electronic component disposed within the housing, wherein the cable extends through the port, and further wherein a portion of the cable is adapted to be removably connected to the housing adjacent an outer surface of the sidewall by a fastener such that the portion of the cable extends along at least a portion of the perimeter of the housing when the portion of the cable is removably connected to the housing.2. The device of claim 1 , wherein the fastener comprises a suture connected to the housing through an opening disposed in at least one of the first major surface or second major surface of the housing adjacent the perimeter of the housing.3. The device of claim 1 , wherein the fastener comprises a slot disposed adjacent ...

DISABLING AN IMPLANTED MEDICAL DEVICE WITH ANOTHER MEDICAL DEVICE

Various techniques for disabling a first implantable medical device (IMD) by modulation of therapeutic electrical stimulation delivered by a second medical device are described. One example method includes delivering therapeutic electrical stimulation from a more recently implanted second IMD at a higher average rate than the previously implanted first IMD so that only the more recently implanted IMD will administer therapy, and modulating stimulation by the more recently implanted IMD in order to send a disable command to the previously implanted IMD.

Isolation of sensing and stimulation circuitry

The disclosure describes techniques of reducing or eliminating a commonality between two modules within the same implantable medical device. Each module within the implantable medical device provides therapy to a patient. The commonality between the two modules exists due to at least one common component shared by the two modules. The commonality between the two modules may create common-mode interference and a shunt current. In accordance with this disclosure, various isolation circuits located at various locations are disclosed to reduce or eliminate the commonality between the two modules. The reduction or elimination of the commonality between the two modules may reduce or eliminate common-mode interference and the shunt current.

Implantable medical device with dual-use communication module

An implantable medical device comprises a communication module that comprises at least one of a receiver module and a transmitter module. The receiver module is configured to both receive from an antenna and demodulate an RF telemetry signal, and receive from a plurality of electrodes and demodulate a tissue conduction communication (TCC) signal. The transmitter module is configured to modulate and transmit both an RF telemetry signal via the antenna and a TCC signal via the plurality of electrodes. The RF telemetry signal and the TCC signal are both within a predetermined band for RF telemetry communication. In some examples, the IMD comprises a switching module configured to selectively couple one of the plurality of electrodes and the antenna to the receiver module or transmitter module.

Tissue conduction communication using ramped drive signal

A device, such as an IMD, having a tissue conductance communication (TCC) transmitter controls a drive signal circuit and a polarity switching circuit by a controller of the TCC transmitter to generate an alternating current (AC) ramp on signal having a peak amplitude that is stepped up from a starting peak-to-peak amplitude to an ending peak-to-peak amplitude according to a step increment and step up interval. The TCC transmitter is further controlled to transmit the AC ramp on signal from the drive signal circuit and the polarity switching circuit via a coupling capacitor coupled to a transmitting electrode vector coupleable to the IMD. After the AC ramp on signal, the TCC transmitter transmits at least one TCC signal to a receiving device.

METHOD FOR DETERMINING COUPLING COEFFICIENT FOR WIRELESS POWER TRANSFER

An external power source, implantable medical device, and method for indicating an extent of power transfer between an external coil to an internal coil associated with the implantable medical device. According to one aspect, a method includes determining a parameter that depends on an extent to which the external coil is aligned with the internal coil, where the parameter includes at least one of an indication of an internal coil output power and power transfer efficiency and a resonant frequency of the external coil when inductively coupled to the internal coil. The method further includes indicating an extent to which the external coil is aligned with the internal coil based on the parameter. 1. An external power source configured to supply power through inductive coupling of power from an external coil to an internal coil associated with an implanted medical device , the external power source comprising:a memory configured to store an internal coil output power, a determined efficiency, and a corresponding coupling coefficient; receive an internal coil output power;', 'determine an efficiency as the ratio of the internal coil output power to an amount of power applied to the external coil;', 'determine a coupling coefficient based on the determined efficiency; and', 'generate an indication of an orientation of the external coil relative to the internal coil, the indication based at least in part on the determined coupling coefficient., 'a processor in communication with the memory, the processor configured to2. The external power source of claim 1 , wherein the indication of orientation is an audible tone that changes in frequency as the orientation changes.3. The external power source of claim 1 , wherein the determined coupling coefficient is determined from a look up table stored in the memory claim 1 , the look up table providing a different coupling coefficient for each of a plurality of efficiency values and received power values.4. The external power ...

Establishing a secure communication link

This disclosure is directed to devices, systems, and techniques for establishing a secure connection between two or more devices. In some examples, a device is configured for wireless communication. The device comprises signal reception circuitry configured to receive communications transmitted according to at least a first communication protocol, communication circuitry configured for wireless communication according to at least a second communication protocol, and processing circuitry electrically coupled to the signal reception circuitry and the communication circuitry. The processing circuitry is configured to receive, via the signal reception circuitry, a first signal according to the first communication protocol. In response to receiving the first signal, the processing circuitry is further configured to transmit, via the communication circuitry, a second signal according to the second communication protocol and establish a secure link according to the second communication protocol ...

PACING ARTIFACT MITIGATION

Various embodiments of a system are disclosed. The system includes a sensing apparatus configured to monitor cardiac electrical activity of a patient and a computing apparatus operatively coupled to the sensing apparatus and configured to monitor cardiac electrical activity using the sensing apparatus to generate a cardiac signal over time, detect a pacing artifact in the cardiac signal, and determine to account for the pacing artifact when using the cardiac signal based on at least one pacing artifact characteristic of the pacing artifact in the cardiac signal. The computing apparatus is further configured to account for the pacing artifact when using the cardiac signal if it is determined to account for the pacing artifact.

IMPLANTABLE MEDICAL DEVICE CROSSTALK EVALUATION AND MITIGATION

Electrical crosstalk between two implantable medical devices or two different therapy modules of a common implantable medical device may be evaluated, and, in some examples, mitigated. In some examples, one of the implantable medical devices or therapy modules delivers electrical stimulation to a nonmyocardial tissue site or a nonvascular cardiac tissue site, and the other implantable medical device or therapy module delivers cardiac rhythm management therapy to a heart of the patient.

TEMPERATURE SENSING OF IMPLANTED WIRELESS RECHARGE COIL

The present disclosure provides a transcutaneous energy transfer system (TETS), having an implantable receiving coil in communication with an implantable controller and a hermetically sealed package encased by the implantable receiving coil. The hermetically sealed package including a plurality of tuning capacitors, at least one temperature sensor, scavenging circuitry configured to scavenge power from the plurality of tuning capacitors, and a temperature measuring circuit in communication with the at least one temperature sensor and the scavenging circuitry. The at least one temperature sensor being configured to measure a temperature of the hermetically sealed package and the temperature measuring circuit being configured to transmit the measured temperature to the implantable controller.

METHOD OF ESTIMATING POWER DISSIPATED IN FOREIGN OBJECT

A method of estimating power dissipated by a foreign metallic object in a transcutaneous energy transfer system (TETS) includes estimating power loss between an external coil of the TETS and an implanted coil of the TETS using a transfer function, the transfer function including inputs, the inputs including: a power supplied to the external coil, a power received by the implanted coil, a measured current within the external coil, and a carrier frequency between the external coil and the implanted coil and generating an alert if the estimated power loss between the external coil and the implanted coil exceeds a predetermined threshold.

RECTIFIER AND THE TIMING OF SWITCHING OF CAPACITORS

An internal coil interface implantable within the body of a patient and configured to modulate a load on an internal coil, and a method therefore are provided. According to one aspect, processing circuitry of the internal coil interface is configured to predict a time of a first voltage level crossing by a voltage at a terminal of the internal coil for each of a plurality of successive windows each time the capacitance is switched into the modulated load circuit or each time the capacitance is switched out of the modulated load circuit. The process is also configured to adjust the predictions based on whether a previous prediction of a time of a first voltage level crossing for a window was later or earlier than a time at which the first voltage level crossing actually occurred.

Implantable medical device crosstalk evaluation and mitigation

Electrical crosstalk between two implantable medical devices or two different therapy modules of a common implantable medical device may be evaluated, and, in some examples, mitigated. In some examples, one of the implantable medical devices or therapy modules delivers electrical stimulation to a nonmyocardial tissue site or a nonvascular cardiac tissue site, and the other implantable medical device or therapy module delivers cardiac rhythm management therapy to a heart of the patient.

Power source selection for a fully implantable lvad system

A method of managing multiple power sources for an implantable blood pump includes operating the implantable blood pump with both power from an internal battery, the internal battery being disposed within an implantable controller and in communication with the implantable blood pump, and with transcutaneous energy transfer system (TETS) power in communication with the implantable blood pump, if TETS power is available.

IMPLANTABLE MEDICAL DEVICE WITH DUAL-USE COMMUNICATION MODULE

An implantable medical device comprises a communication module that comprises at least one of a receiver module and a transmitter module. The receiver module is configured to both receive from an antenna and demodulate an RF telemetry signal, and receive from a plurality of electrodes and demodulate a tissue conduction communication (TCC) signal. The transmitter module is configured to modulate and transmit both an RF telemetry signal via the antenna and a TCC signal via the plurality of electrodes. The RF telemetry signal and the TCC signal are both within a predetermined band for RF telemetry communication. In some examples, the IMD comprises a switching module configured to selectively couple one of the plurality of electrodes and the antenna to the receiver module or transmitter module. 1. An implantable medical device configured for implantation in a patient comprising:an antenna;a plurality of electrodes; and a communication receiver module configured to receive and demodulate signals within a predetermined frequency band for radio-frequency (RF) telemetry communication, wherein the communication receiver module is configured to receive from the antenna and demodulate a first RF telemetry signal emitted by an external device outside of the patient, and receive from the plurality of electrodes and demodulate a first tissue conduction communication (TCC) signal emitted by another implantable medical device implanted within the patient, wherein the first RF telemetry signal and the first TCC signal are within the predetermined band for RF telemetry communication; or', 'a communication transmitter module configured to modulate and transmit signals within the predetermined frequency band for RF telemetry communication, wherein the communication transmitter module is configured to modulate and transmit a second RF telemetry signal to the external device via the antenna, and modulate and transmit a second TCC signal to the other implantable medical device via the ...

Signal transmission optimization for tissue conduction communication

A device includes a tissue conduction communication (TCC) transmitter that generates a TCC signal including a carrier signal having a peak-to-peak amplitude and a carrier frequency cycle length including a first polarity pulse for a first half of the carrier frequency cycle length and a second polarity pulse opposite the first polarity pulse for a second half of the carrier frequency cycle length. Each of the first polarity pulse and the second polarity pulse inject a half cycle charge into a TCC pathway. The TCC transmitter starts transmitting the TCC signal with a starting pulse having a net charge that is half of the half cycle charge and transmits alternating polarity pulses of the carrier signal consecutively following the starting pulse.

DEVICE AND METHOD TO REDUCE ARTIFACT FROM TISSUE CONDUCTION COMMUNICATION TRANSMISSION

A device is configured to transmit tissue conductance communication (TCC) signals by generating multiple TCC signals by a TCC transmitter of the IMD. The generated TCC signals are coupled to a transmitting electrode vector via a coupling capacitor to transmit the plurality of TCC signals to a receiving medical device via a conductive tissue pathway. A voltage holding circuit holds the coupling capacitor at a DC voltage for a time interval between two consecutively transmitted TCC signals. 1. A device comprising:a housing; and a coupling capacitor for coupling the generated TCC signals to a transmitting electrode vector to transmit the plurality of TCC signals via a conductive tissue pathway; and', 'a voltage holding circuit configured to hold the coupling capacitor at a direct current (DC) voltage for a time interval between two consecutively transmitted TCC signals of the plurality of TCC signals., 'a tissue conduction communication (TCC) transmitter enclosed by the housing and configured to generate a plurality of TCC signals, the TCC transmitter comprising2. The device of claim 1 , wherein:the voltage holding circuit comprises at least one switch connecting the coupling capacitor to the transmitting electrode vector; opening the at least one switch after a first of the two consecutively transmitted TCC signals, and', 'closing the at least one switch at a start of a second of the two consecutively transmitted TCC signals., 'the TCC transmitter comprises a controller configured to control the voltage holding circuit to hold the coupling capacitor at the DC voltage by3. The device of claim 2 , wherein:the voltage holding circuit comprises at least two switches, a first switch connecting the coupling capacitor to a source of the TCC signal and a second switch connecting the coupling capacitor to the transmitting electrode vector; opening the first and second switch after a first of the two consecutively transmitted TCC signals to float the coupling capacitor, and', ' ...

TISSUE CONDUCTION COMMUNICATION USING RAMPED DRIVE SIGNAL

A device, such as an IMD, having a tissue conductance communication (TCC) transmitter controls a drive signal circuit and a polarity switching circuit by a controller of the TCC transmitter to generate an alternating current (AC) ramp on signal having a peak amplitude that is stepped up from a starting peak-to-peak amplitude to an ending peak-to-peak amplitude according to a step increment and step up interval. The TCC transmitter is further controlled to transmit the AC ramp on signal from the drive signal circuit and the polarity switching circuit via a coupling capacitor coupled to a transmitting electrode vector coupleable to the IMD. After the AC ramp on signal, the TCC transmitter transmits at least one TCC signal to a receiving device. 1. A device comprising:a housing; and generate a TCC ramp on signal having a peak-to-peak amplitude that is stepped up from a starting peak-to-peak amplitude to an ending peak-to-peak amplitude according to a step increment and a step up interval;', 'transmit the TCC ramp on signal via the coupling capacitor coupled to the transmitting electrode vector; and', 'transmit a second TCC signal after the TCC ramp on signal., 'a tissue conductance communication (TCC) transmitter enclosed by the housing and including a coupling capacitor for coupling TCC signals to a transmitting electrode vector, the TCC transmitter configured to2. The device of claim 1 , wherein the TCC transmitter is configured to transmit the second TCC signal having a first maximum peak-to-peak amplitude that is equal to or greater than the ending peak-to-peak amplitude of the TCC ramp on signal.3. The device of claim 2 , wherein the TCC transmitter is configured to:subsequent to transmitting the second TCC signal, generate at least one TCC data signal comprising a modulated carrier signal encoded with data using a first modulation scheme and having a second maximum peak amplitude; andtransmit the at least one TCC data signal.4. The device of claim 3 , wherein the ...

TISSUE CONDUCTION COMMUNICATION BETWEEN DEVICES

A system, such as an IMD system, includes a tissue conductance communication (TCC) transmitter configured to generate a beacon signal by generating a carrier signal and modulating a first property of the carrier signal according to a first type of modulation. The TCC transmitter is configured to generate a data signal subsequent to the beacon signal by generating the carrier signal and modulating a second property of the carrier signal different than the first property according to a second type of modulation different than the first type of modulation. 1. A device comprising:a housing; generate a TCC carrier signal;', 'generate at least one TCC beacon signal by modulating a first property of the TCC carrier signal according to a first type of modulation;', 'generate at least one TCC data signal subsequent to the at least one TCC beacon signal by modulating a second property of the TCC carrier signal different than the first property according to a second type of modulation different than the first type of modulation; and', 'transmitting the at least one TCC beacon signal and at least one TCC data signal., 'a tissue conduction communication (TCC) transmitter enclosed by the housing and configured to2. The device of claim 1 , wherein the TCC transmitter is configured to:modulate the first property of the TCC carrier signal by modulating a frequency of the TCC carrier signal according to a frequency shift keying (FSK) modulation, andmodulate the second property of the TCC carrier signal by modulating a phase of the TCC carrier signal according to a phase shift keying (PSK) modulation.3. The device of claim 1 , wherein the TCC transmitter is configured to generate the TCC beacon signal by:modulating a frequency of the TCC carrier signal between a first frequency transmitted for a first number of cycles and a second frequency transmitted for a second number of cycles, the first frequency greater than the frequency of the TCC carrier signal and the second frequency less ...

INTEGRITY MONITORING FOR A TRANSCUTANEOUS ENERGY SYSTEM

According to one or more embodiments, a system is provided. The system includes a power device implantable within a patient for powering an implantable medical device. The power device includes a first coil configured to receive wireless power signals for powering the implantable medical device and processing circuitry configured to determine at least one measurable electrical characteristic in a plurality of electrical pathways in the power device including an electrical pathway to the first coil, and detect reduced performance in receiving wireless power signals based at least in part on the determined at least one measurable electrical characteristic. 1. A system , comprising: a first coil configured to receive wireless power signals for powering the implantable medical device;', determine at least one measurable electrical characteristic in a plurality of electrical pathways in the power device including an electrical pathway to the first coil; and', 'detect reduced performance in receiving wireless power signals based at least in part on the determined at least one measurable electrical characteristic., 'processing circuitry configured to], 'a power device implantable within a patient for powering an implantable medical device, the power device including2. The system of claim 1 , further comprising an external device positioned outside of the patient for providing power to the implantable medical device claim 1 , the external device including:a second coil for transmitting power signals; receive an indication of power received by the power device; and', 'determine a wireless power transfer efficiency over a predetermined period of time based at least in part on the received indication of the power received by the power device., 'processing circuitry configured to3. The system of claim 2 , wherein the wireless power transfer efficiency over the predetermined period of time corresponds to a long term moving average.4. The system of claim 3 , wherein the long term ...

IMPLANTABLE MEDICAL DEVICE WITH DUAL-USE COMMUNICATION MODULE

An implantable medical device comprises a communication module that comprises at least one of a receiver module and a transmitter module. The receiver module is configured to both receive from an antenna and demodulate an RF telemetry signal, and receive from a plurality of electrodes and demodulate a tissue conduction communication (TCC) signal. The transmitter module is configured to modulate and transmit both an RF telemetry signal via the antenna and a TCC signal via the plurality of electrodes. The RF telemetry signal and the TCC signal are both within a predetermined band for RF telemetry communication. In some examples, the IMD comprises a switching module configured to selectively couple one of the plurality of electrodes and the antenna to the receiver module or transmitter module. 1. An implantable medical device configured for implantation in a patient comprising:an antenna;a plurality of electrodes; and a communication receiver module configured to receive and demodulate signals within a predetermined frequency band for radio-frequency (RF) telemetry communication, wherein the communication receiver module is configured to receive from the antenna and demodulate a first RF telemetry signal emitted by an external device outside of the patient, and receive from the plurality of electrodes and demodulate a first tissue conduction communication (TCC) signal emitted by another implantable medical device implanted within the patient, wherein the first RF telemetry signal and the first TCC signal are within the predetermined band for RF telemetry communication; or', 'a communication transmitter module configured to modulate and transmit signals within the predetermined frequency band for RF telemetry communication, wherein the communication transmitter module is configured to modulate and transmit a second RF telemetry signal to the external device via the antenna, and modulate and transmit a second TCC signal to the other implantable medical device via the ...

RF POWER TRANSFER COIL FOR IMPLANTABLE VAD PUMPS

An implantable radiofrequency receiving coil configured to electrically couple with a radiofrequency source coil for transcutaneous energy transfer. The receiving coil includes at least one copper conductor defining a coil and configured to power an implantable blood pump. The at least one copper conductor is coated with tantalum. 1. An implantable radiofrequency receiving coil configured to electrically couple with a radiofrequency source coil for transcutaneous energy transfer , the receiving coil comprising:at least one copper conductor defining a coil and configured to power an implantable blood pump, the at least one copper conductor being coated with tantalum.2. The receiving coil of claim 1 , wherein the at least one copper conductor includes a plurality of copper conductors claim 1 , each of the plurality of conductors being coated with tantalum and being insulated from an adjacent one of the plurality of conductors.3. The receiving coil of claim 2 , wherein the receiving coil defines a Litz wire.4. The receiving coil of claim 1 , wherein the tantalum completely surrounds the at least one copper conductor.5. The receiving coil of claim 1 , wherein the at least one copper conductor is entirely composed of copper.6. The receiving coil of claim 1 , wherein the tantalum includes tantalum pentoxide.7. A transcutaneous energy transfer system for powering an implantable medical device claim 1 , comprising:a source coil positionable on a patient's skin;a battery electrically coupled to the source coil, the source coil being configured to transfer electrical energy through the patient's skin;a receiving coil implantable within the patient, the receiving coil being configured to receive the energy transferred by the source coil, the receiving coil including at least one copper conductor defining a coil and configured to power the implantable medical device, the at least one copper conductor being coated with one from the group consisting of graphene and tantalum; ...

Communication between implantable medical devices

A first implantable medical device (IMD) implanted within a patient may communicate with a second IMD implanted within the patient by encoding information in an electrical stimulation signal. The delivery of the electrical stimulation signal may provide therapeutic benefits to the patient. The second IMD may sense the electrical stimulation signal, which may be presented as an artifact in a sensed cardiac signal, and process the sensed signal to retrieve the encoded information. The second IMD may modify its operation based on the received therapy information. Crosstalk between the first and second IMDs may be reduced using various techniques described herein. For example, the first IMD may generate the electrical stimulation signal to include a spread spectrum energy distribution or a predetermined signal signature. The second IMD may effectively remove a least some of the signal artifact in a sensed cardiac signal based on the predetermined signal signature.

Tissue conduction communication between devices

A system, such as an IMD system, includes a tissue conductance communication (TCC) transmitter configured to generate a beacon signal by generating a carrier signal and modulating a first property of the carrier signal according to a first type of modulation. The TCC transmitter is configured to generate a data signal subsequent to the beacon signal by generating the carrier signal and modulating a second property of the carrier signal different than the first property according to a second type of modulation different than the first type of modulation.

Device and method to reduce artifact from tissue conduction communication transmission

A device is configured to transmit tissue conductance communication (TCC) signals by generating multiple TCC signals by a TCC transmitter of the IMD. The generated TCC signals are coupled to a transmitting electrode vector via a coupling capacitor to transmit the plurality of TCC signals to a receiving medical device via a conductive tissue pathway. A voltage holding circuit holds the coupling capacitor at a DC voltage for a time interval between two consecutively transmitted TCC signals.

Miniature linear motion actuator

A linear actuator device. A first mode of operation uses a single clamping technique whereby a piezoelectric element is slowly expanded, in a way such that a clamping force between that element and its base holds it in place. The piezoelectric element is then contracted in size very quickly, and the inertia created by that action overcomes the clamping force and moves relative to the base. A second mode uses a double clamping technique where first the rear is clamped and the front moved forward then the front is clamped and the rear moved forward. All of these embodiments preferably use semiconductor materials, enabling formation of very thin layers and small devices.

Communication dipole for implantable medical device

This disclosure is directed to an implantable medical device having a communication dipole configured in accordance with the techniques described herein. In one example, the disclosure is directed to an implantable medical device comprising a housing that encloses at least a communication module, a first electrode of a communication dipole electrically coupled to the communication module and an electrically conductive fixation mechanism that is electrically coupled to a portion of the housing and wherein a portion of the fixation mechanism is configured to function as at least part of a second electrode of the communication dipole. The electrically conductive fixation mechanism includes a dielectric material that covers at least part of a surface of the fixation mechanism. The communication module is configured to transmit or receive a modulated signal between the first electrode and second electrode of the communication dipole.

Adaptive interference reduction during telemetry

An implantable medical device has a first module for performing telemetry communications with another device and a second module for delivering a high voltage therapy to a patient. The first module is configured to detect a communication error, and the second module is configured to determine a need for the therapy and to charge a capacitor in response to the need for the therapy. The second module is configured to suspend the capacitor charging in response to receiving a notification from the first module corresponding to detecting a communication error.

Rf power transfer coil for implantable vad pumps

An implantable radiofrequency receiving coil configured to electrically couple with a radiofrequency source coil for transcutaneous energy transfer. The receiving coil includes at least one copper conductor defining a coil and configured to power an implantable blood pump. The at least one copper conductor is coated with tantalum.

Implantable medical device with dual-use communication module

An implantable medical device comprises a communication module that comprises at least one of a receiver module and a transmitter module. The receiver module is configured to both receive from an antenna and demodulate an RF telemetry signal, and receive from a plurality of electrodes and demodulate a tissue conduction communication (TCC) signal. The transmitter module is configured to modulate and transmit both an RF telemetry signal via the antenna and a TCC signal via the plurality of electrodes. The RF telemetry signal and the TCC signal are both within a predetermined band for RF telemetry communication. In some examples, the IMD comprises a switching module configured to selectively couple one of the plurality of electrodes and the antenna to the receiver module or transmitter module.

Disabling an implanted medical device with another medical device

Various techniques for disabling a first implantable medical device (IMD) by modulation of therapeutic electrical stimulation delivered by a second medical device are described. One example method includes delivering therapeutic electrical stimulation from a more recently implanted second IMD at a higher average rate than the previously implanted first IMD so that only the more recently implanted IMD will administer therapy, and modulating stimulation by the more recently implanted IMD in order to send a disable command to the previously implanted IMD.

Miniature linear motion actuator

Signal transmission optimization for tissue conduction communication

A device includes a tissue conduction communication (TCC) transmitter that generates a TCC signal including a carrier signal having a peak-to-peak amplitude and a carrier frequency cycle length including a first polarity pulse for a first half of the carrier frequency cycle length and a second polarity pulse opposite the first polarity pulse for a second half of the carrier frequency cycle length. Each of the first polarity pulse and the second polarity pulse inject a half cycle charge into a TCC pathway. The TCC transmitter starts transmitting the TCC signal with a starting pulse having a net charge that is half of the half cycle charge and transmits alternating polarity pulses of the carrier signal consecutively following the starting pulse.

Foldable lens delivery system

An automatic lens delivery device using a linear actuator which is specially adapted for low torque, low heat applications, and can be used to insert a lens into a user's eye. The linear actuator uses two semiconductor devices which are moved one relative to the other. The movable device pushes a push rod that delivers a lens.

Implantable medical device crosstalk evaluation and mitigation

Electrical crosstalk between two implantable medical devices or two different therapy modules of a common implantable medical device may be evaluated, and, in some examples, mitigated. In some examples, one of the implantable medical devices or therapy modules delivers electrical stimulation to a nonmyocardial tissue site or a nonvascular cardiac tissue site, and the other implantable medical device or therapy module delivers cardiac rhythm management therapy to a heart of the patient.

Implantable medical device crosstalk evaluation and mitigation

Tissue conduction communication between devices

A system, such as an IMD system, includes a tissue conductance communication (TCC) transmitter configured to generate a beacon signal by generating a carrier signal and modulating a first property of the carrier signal according to a first type of modulation. The TCC transmitter is configured to generate a data signal subsequent to the beacon signal by generating the carrier signal and modulating a second property of the carrier signal different than the first property according to a second type of modulation different than the first type of modulation.

Method for regulating tets power transfer

In an implanted medical device system, an internal controller, external power transmitter and methods for regulation of TETS power for an implanted medical device system are disclosed. According to one aspect, a method in an external power transmitter of an implanted medical device system includes determining a current in an external coil of the external power transmitter, multiplying the determined current by a supply voltage to determine a power delivered to the external coil, and controlling the power delivered to the external coil by adjusting the current in the external coil.

Establishing a secure communication link

This disclosure is directed to devices, systems, and techniques for establishing a secure connection between two or more devices. In some examples, a device is configured for wireless communication. The device comprises signal reception circuitry configured to receive communications transmitted according to at least a first communication protocol, communication circuitry configured for wireless communication according to at least a second communication protocol, and processing circuitry electrically coupled to the signal reception circuitry and the communication circuitry. The processing circuitry is configured to receive, via the signal reception circuitry, a first signal according to the first communication protocol. In response to receiving the first signal, the processing circuitry is further configured to transmit, via the communication circuitry, a second signal according to the second communication protocol and establish a secure link according to the second communication protocol.

Therapy module crosstalk mitigation

A first implantable medical device (IMD) implanted within a patient may communicate with a second IMD implanted within the patient by encoding information in an electrical stimulation signal. The delivery of the electrical stimulation signal may provide therapeutic benefits to the patient. The second IMD may sense the electrical stimulation signal, which may be presented as an artifact in a sensed cardiac signal, and process the sensed signal to retrieve the encoded information. The second IMD may modify its operation based on the received therapy information. Crosstalk between the first and second IMDs may be reduced using various techniques described herein. For example, the first IMD may generate the electrical stimulation signal to include a spread spectrum energy distribution or a predetermined signal signature. The second IMD may effectively remove a least some of the signal artifact in a sensed cardiac signal based on the predetermined signal signature.

Method for power monitoring and dynamically managing power in a fully implanted lvad system

In an implanted medical device system, an internal controller, external power transmitter and methods for monitoring and dynamically managing power in an implanted medical device system are disclosed. According to one aspect, an internal controller is configured to provide power to a motor of an implanted medical device, the power being drawn from at least one of an internal battery and an internal coil, the at least one of the internal battery and the internal coil providing a supplied voltage. The internal controller includes processing circuitry configured to switch to one of the internal battery, the internal coil and a combination of the internal battery and the internal coil, based on a comparison of the supplied voltage to a threshold.

Method for adjusting the rate of "searching pulses" in a tets system

In an implanted medical device system, an external power transmitter and methods for adjusting a rate of search pulse transmission by an external power transmitter of an implanted medical device system are disclosed. According to one aspect, a method includes detecting a condition of the external power transmitter, and selecting among rates of transmission of search pulses based on the detected condition.

Rectifier and the timing of switching of capacitors

An internal coil interface implantable within the body of a patient and configured to modulate a load on an internal coil, and a method therefore are provided. According to one aspect, processing circuitry of the internal coil interface is configured to predict a time of a first voltage level crossing by a voltage at a terminal of the internal coil for each of a plurality of successive windows each time the capacitance is switched into the modulated load circuit or each time the capacitance is switched out of the modulated load circuit. The process is also configured to adjust the predictions based on whether a previous prediction of a time of a first voltage level crossing for a window was later or earlier than a time at which the first voltage level crossing actually occurred.

Managing the electric field exposure in a fully implanted lvad system

An external power transmitter of an implanted medical device system such as a left ventricular assist device (LVAD) system and a method therefore are provided. According to one aspect, a method includes transitioning from applying a first external coil current limit to applying a second external coil current limit to limit current of an external coil coupled to the external power transmitter, the transitioning being based on at least one of an intent to enter a free mode of operation of the implanted medical device system, an existence of an alarm condition, and an existence of transcutaneous energy transfer system (TETS) power transfer.

Managing the electric field exposure in a fully implanted lvad system

An external power transmitter of an implanted medical device system such as a left ventricular assist device (LVAD) system and a method therefore are provided. According to one aspect, a method includes transitioning from applying a first external coil current limit to applying a second external coil current limit to limit current of an external coil coupled to the external power transmitter, the transitioning being based on at least one of an intent to enter a free mode of operation of the implanted medical device system, an existence of an alarm condition, and an existence of transcutaneous energy transfer system (TETS) power transfer.

Method of detecting presence of implanted power transfer coil

A method and apparatus related to detecting the presence of a power transfer coil implanted in a patient are disclosed. According to the aspect, an external device of a medical implant system is provided, the external device having an external coil and processing circuitry. The processing circuitry is configured to monitor a resonance frequency associated with the external coil. When the resonance frequency changes as a distance between the external coil and an expected location of an internal coil, then the processing circuitry is configured to conclude that the internal coil has been detected. When the resonance frequency ramps up to a steady state value at a rate that falls below a rate threshold, then the processing circuitry is configured to conclude that the internal coil is connected to an internal load.

Electric field rejection of a dual coil telemetry system

An example telemetry system includes telemetry circuitry configured to communicate with a first device and being located on a circuit board. The telemetry system includes a first bobbin, the first bobbin being located on a first side of the circuit board. The telemetry system includes a first coil, the first coil being wound on the first bobbin in a first direction. The telemetry system includes a second bobbin, the second bobbin being located on a second side of the circuit board. The telemetry system includes a second coil, the second coil being wound on a second bobbin in a second direction, the second direction being opposite the first direction. An outer loop of the first coil and an outer loop of the second coil are electrically coupled together.

Verfahren zur leistungsüberwachung und dynamischen verwaltung der leistung in einem vollständig implantierten lvad-system

In einem System einer implantierten medizinischen Vorrichtung werden eine interne Steuerung, ein externer Leistungssender und Verfahren zum Überwachen und dynamischen Verwalten von Leistung in einem System einer implantierten medizinischen Vorrichtung offenbart. Gemäß einem Aspekt ist eine interne Steuerung konfiguriert, um einen Motor einer implantierten medizinischen Vorrichtung mit Leistung zu versorgen, wobei die Leistung von mindestens einer von einer internen Batterie und einer internen Spule bezogen wird, wobei die mindestens eine der internen Batterie und der internen Spule eine zugeführte Spannung bereitstellt. Die interne Steuerung schließt eine Verarbeitungsschaltung ein, die konfiguriert ist, um zu einer der internen Batterie, der internen Spule und einer Kombination der internen Batterie und der internen Spule basierend auf einem Vergleich der zugeführten Spannung mit einer Schwelle umzuschalten.

Implantable medical device crosstalk evaluation and mitigation

Electrical crosstalk between two implantable medical devices or two different therapy modules of a common implantable medical device may be evaluated, and, in some examples, mitigated. In some examples, one of the implantable medical devices or therapy modules delivers electrical stimulation to a nonmyocardial tissue site or a nonvascular cardiac tissue site, and the other implantable medical device or therapy module delivers cardiac rhythm management therapy to a heart of the patient.

Method for regulating tets power transfer

In an implanted medical device system, an internal controller, external power transmitter and methods for regulation of TETS power for an implanted medical device system are disclosed. According to one aspect, a method in an external power transmitter of an implanted medical device system includes determining a current in an external coil of the external power transmitter, multiplying the determined current by a supply voltage to determine a power delivered to the external coil, and controlling the power delivered to the external coil by adjusting the current in the external coil.

Enhanced telemetry of a medical system via improved link quality for a medical device

This disclosure is directed to systems and techniques for enhancing memory interrogations of a medical device by an external device. In some examples, the systems and techniques overcome issues of poor link quality, particularly when the memory stores time-sensitive and critical patient information, by reducing an individual packet size to fit an allotted time period for the transmission. Based on satisfaction of at least criterion for the communication channel, the systems and techniques direct the medical device to transmit, from the memory and over the communication channel, a number of packets comprising duplicate copies of the packetized dataset, wherein a number of the duplicate copies is set to be commensurate with a reduction to the individual packet size.

Integrity monitoring for a transcutaneous energy system

According to one or more embodiments, a system is provided. The system includes a power device implantable within a patient for powering an implantable medical device. The power device includes a first coil configured to receive wireless power signals for powering the implantable medical device and processing circuitry configured to determine at least one measurable electrical characteristic in a plurality of electrical pathways in the power device including an electrical pathway to the first coil, and detect reduced performance in receiving wireless power signals based at least in part on the determined at least one measurable electrical characteristic.

Method of detecting presence of implanted power transfer coil

A method and apparatus related to detecting the presence of a power transfer coil implanted in a patient are disclosed. According to the aspect, an external device of a medical implant system is provided, the external device having an external coil and processing circuitry. The processing circuitry is configured to monitor a resonance frequency associated with the external coil. When the resonance frequency changes as a distance between the external coil and an expected location of an internal coil, then the processing circuitry is configured to conclude that the internal coil has been detected. When the resonance frequency ramps up to a steady state value at a rate that falls below a rate threshold, then the processing circuitry is configured to conclude that the internal coil is connected to an internal load.

Isolation of sensing and stimulation circuitry

The disclosure describes techniques of reducing or eliminating a commonality between two modules within the same implantable medical device. Each module within the implantable medical device provides therapy to a patient. The commonality between the two modules exists due to at least one common component shared by the two modules. The commonality between the two modules may create common-mode interference and a shunt current. In accordance with this disclosure, various isolation circuits located at various locations are disclosed to reduce or eliminate the commonality between the two modules. The reduction or elimination of the commonality between the two modules may reduce or eliminate common-mode interference and the shunt current.

Tissue conduction communication using ramped drive signal

A device, such as an IMD, having a tissue conductance communication (TCC) transmitter controls a drive signal circuit and a polarity switching circuit by a controller of the TCC transmitter to generate an alternating current (AC) ramp on signal having a peak amplitude that is stepped up from a starting peak-to-peak amplitude to an ending peak-to-peak amplitude according to a step increment and step up interval. The TCC transmitter is further controlled to transmit the AC ramp on signal from the drive signal circuit and the polarity switching circuit via a coupling capacitor coupled to a transmitting electrode vector coupleable to the IMD. After the AC ramp on signal, the TCC transmitter transmits at least one TCC signal to a receiving device.

Verfahren zum Einstellen der Rate von "Suchimpulsen" in einem Tets-System

In einem System einer implantierten medizinischen Vorrichtung sind ein externer Leistungssender und Verfahren zum Einstellen einer Rate der Suchimpulsübertragung durch einen externen Leistungssender eines Systems einer implantierten medizinischen Vorrichtung offenbart. Gemäß einem Aspekt schließt ein Verfahren das Erfassen eines Zustands des externen Leistungssenders und das Auswählen zwischen Übertragungsraten von Suchimpulsen basierend auf dem erfassten Zustand ein.

Implantable medical device crosstalk evaluation and mitigation

Electrical crosstalk between two implantable medical devices or two different therapy modules of a common implantable medical device may be evaluated, and, in some examples, mitigated. In some examples, one of the implantable medical devices or therapy modules delivers electrical stimulation to a nonmyocardial tissue site or a nonvascular cardiac tissue site, and the other implantable medical device or therapy module delivers cardiac rhythm management therapy to a heart of the patient.

Implantable medical device crosstalk evaluation and mitigation

Electrical crosstalk between two implantable medical devices or two different therapy modules of a common implantable medical device may be evaluated, and, in some examples, mitigated. In some examples, one of the implantable medical devices or therapy modules delivers electrical stimulation to a nonmyocardial tissue site or a nonvascular cardiac tissue site, and the other implantable medical device or therapy module delivers cardiac rhythm management therapy to a heart of the patient.

Method for power monitoring and dynamically managing power in a fully implanted LVAD system

In an implanted medical device system, an internal controller, external power transmitter and methods for monitoring and dynamically managing power in an implanted medical device system are disclosed. According to one aspect, an internal controller is configured to provide power to a motor of an implanted medical device, the power being drawn from at least one of an internal battery and an internal coil, the at least one of the internal battery and the internal coil providing a supplied voltage. The internal controller includes processing circuitry configured to switch to one of the internal battery, the internal coil and a combination of the internal battery and the internal coil, based on a comparison of the supplied voltage to a threshold.

Digital zeitgesteuerter CMOS-Gleichrichter für drahtlose Leistungsübertragung

Es wird ein digital zeitgesteuerter komplementärer Metalloxid-Halbleiter-Gleichrichter (CMOS-Gleichrichter) für drahtlose Leistungsübertragung in einer implantierten medizinischen Vorrichtung bereitgestellt. Gemäß einem Gesichtspunkt schließt eine Spannungsgleichrichterschaltung für eine medizinische Vorrichtung, die eine interne Spule und eine interne Schaltlogik aufweist, einen Spannungsgleichrichter ein, der eine komplementäre Metalloxid-Halbleiterschaltung (CMOS-Schaltung), die low-side MOS-Transistoren des ersten Typs und obere kreuzgekoppelte MOS-Transistoren des zweiten Typs aufweist, umfasst. Der Spannungsgleichrichter kann konfiguriert sein, um eine gleichgerichtete empfangene Spannung auszugeben, wobei jeder low-side MOS-Transistor des ersten Typs mit einer MOS-Körperdiode des ersten Typs konfiguriert ist, wobei die low-side MOS-Transistoren des ersten Typs durch ein Zeitsteuerungssignal freigegeben werden, um eine Leitung durch die low-side MOS-Transistoren des ersten Typs bereitzustellen, während die Leitung durch die MOS-Körperdiode des ersten Typs während eines Zeitfensters, das eine Dauer aufweist, die durch Spannungspegelüberschreitungen der empfangenen Spannung bestimmt wird, umgangen wird.

Auswahl der leistungsquelle für ein vollständig implantierbares lvad-system

Ein Verfahren zum Verwalten mehrerer Leistungsquellen für eine implantierbare Blutpumpe schließt das Betreiben der implantierbaren Blutpumpe sowohl mit Leistung von einer internen Batterie, wobei die interne Batterie innerhalb einer implantierbaren Steuerung angeordnet ist und mit der implantierbaren Blutpumpe in Verbindung steht, als auch mit Leistung von dem transkutanen Energieübertragungssystem (TETS) ein, das mit der implantierbaren Blutpumpe in Verbindung steht, falls TETS-Leistung verfügbar ist.

Digitally timed cmos rectifier for wireless power transfer

A digitally timed complementary metal oxide semiconductor (CMOS) rectifier for wireless power transfer in an implanted medical device is provided. According to one aspect, a voltage rectification circuit for a medical device having an internal coil and internal circuitry includes a voltage rectifier comprising a complementary metal oxide semiconductor (CMOS) circuit having low-side first type MOS transistors and upper cross-coupled second type MOS transistors. The voltage rectifier may be configured to output a rectified received voltage, each low-side first type MOS transistor being configured with an first type MOS body diode, the low-side first type MOS transistors being enabled by a timing signal to provide conduction through the low-side first type MOS transistors while bypassing conduction through the first type MOS body diode during a time window having a duration determined by voltage level crossings of the received voltage.

Implantable medical device crosstalk evaluation and mitigation

Electrical crosstalk between two implantable medical devices or two different therapy modules of a common implantable medical device may be evaluated, and, in some examples, mitigated. In some examples, one of the implantable medical devices or therapy modules delivers electrical stimulation to a nonmyocardial tissue site or a nonvascular cardiac tissue site, and the other implantable medical device or therapy module delivers cardiac rhythm management therapy to a heart of the patient.

Coil shunting for voltage limiting of inductively transferred power

An internal controller and an external power transmitter of an implanted medical device system and method therefore are provided. According to one aspect, an external power transmitter as part of a implanted medical device system includes processing circuitry configured to detect a shunting condition of an internal coil of the implanted medical device system, and responsive to detecting a shunting condition, reduce a magnitude of power transmitted to the internal coil.

Implantable medical device antenna

An implantable medical device (IMD) comprises a housing, a communication circuit within the housing, and an antenna. The antenna comprises a forming part of the housing, a first metal portion adjacent to the non-conductive component on a first side of the non-conductive component, a second metal portion adjacent to the non-conductive component on a second side of the non-conductive component and a plurality of switchable contacts configured to couple the dielectric antenna to the communication circuit, wherein the plurality of switchable contacts are configurable according to a. selected excitation mode of a plurality of excitation modes to connect the communication circuit to the antenna via a selected one or more of the plurality of contacts to excite the antenna to provide radiofrequency (RF) wireless communications between the IMD and an external device.

Establishing a secure communication link between an implantable device and one or more external devices

This disclosure is directed to devices, systems, and techniques for establishing a secure connection between two or more devices. In some examples, a device is configured for wireless communication. The device comprises signal reception circuitry configured to receive communications transmitted according to at least a first communication protocol, communication circuitry configured for wireless communication according to at least a second communication protocol, and processing circuitry electrically coupled to the signal reception circuitry and the communication circuitry. The processing circuitry is configured to receive, via the signal reception circuitry, a first signal according to the first communication protocol. In response to receiving the first signal, the processing circuitry is further configured to transmit, via the communication circuitry, a second signal according to the second communication protocol and establish a secure link according to the second communication protocol.

Method for regulating tets power transfer

In an implanted medical device system, an internal controller, external power transmitter and methods for regulation of TETS power for an implanted medical device system are disclosed. According to one aspect, a method in an external power transmitter of an implanted medical device system includes determining a current in an external coil of the external power transmitter, multiplying the determined current by a supply voltage to determine a power delivered to the external coil, and controlling the power delivered to the external coil by adjusting the current in the external coil.