PROCESS FOR GROWING SILICON CARBIDE SINGLE CRYSTAL BY PHYSICAL VAPOR TRANSPORT METHOD AND ANNEALING SILICON CARBIDE SINGLE CRYSTAL IN SITU

A technology for growing silicon carbide single crystals by PVT (Physical Vapor Transport) and a technology for in-situ annealing the crystals after growth is finished is provided. The technology can achieve real-time dynamic control of the temperature distribution of growth chamber by regulating the position of the insulation layer on the upper part of the graphite crucible, thus controlling the temperature distribution of growth chamber in real-time during the growth process according to the needs of the technology, which helps to significantly improve the crystal quality and production yield. After growth is finished, the inert gas pressure in growth chamber is raised and the temperature gradient of the growth chamber is reduced so that in-situ annealing the silicon carbide crystals can be carried out under a small one, which helps to reduce the stress between the crystal and the crucible lid as well as that in sublimation grown crystals to reduce the breakage ratio and improve the yield ratio during the subsequent fabrication process. 1. A process for growing silicon carbide single crystals by Physical Vapor Transport , which can achieve real-time dynamic control of the temperature distribution of a growth chamber by regulating the position of an insulation layer on the upper part of the graphite crucible , for controlling the temperature distribution of the growth chamber in real-time during the growth process according to the needs of the technology , wherein said process comprises:on loading a crucible inside the furnace, regulating the position of the insulation layer by an automatic drive and then recording a relative position of it inside the furnace body; during the growth process, using the automatic drive to adjust the relative position of the insulation layer according to the needs of the technology to make the temperature distribution of growth chamber form a desired one, wherein the structures of the upper thermal insulation layer are fitted with the ...

SEMI-INSULATING SILICON CARBIDE MONOCRYSTAL AND METHOD OF GROWING THE SAME

A semi-insulating silicon carbide monocrystal and a method of growing the same are disclosed. The semi-insulating silicon carbide monocrystal comprises intrinsic impurities, deep energy level dopants and intrinsic point defects. The intrinsic impurities are introduced unintentionally during manufacture of the silicon carbide monocrystal, and the deep energy level dopants and the intrinsic point defects are doped or introduced intentionally to compensate for the intrinsic impurities. The intrinsic impurities include shallow energy level donor impurities and shallow energy level acceptor impurities. A sum of a concentration of the deep energy level dopants and a concentration of the intrinsic point defects is greater than a difference between a concentration of the shallow energy level donor impurities and a concentration of the shallow energy level acceptor impurities, and the concentration of the intrinsic point defects is less than the concentration of the deep energy level dopants. The semi-insulating SiC monocrystal has resistivity greater than 1×10Ω·cm at room temperature, and its electrical performances and crystal quality satisfy requirements for manufacture of microwave devices. The deep energy level dopants and the intrinsic point defects jointly serve to compensate the intrinsic impurities, so as to obtain a high quality semi-insulating single crystal. 1. A semi-insulating silicon carbide monocrystal , comprising intrinsic impurities , deep energy level dopants and intrinsic point defects ,wherein the intrinsic impurities are introduced unintentionally during manufacture of the silicon carbide monocrystal, and the deep energy level dopants and the intrinsic point defects are doped or introduced intentionally to compensate for the intrinsic impurities,wherein the intrinsic impurities comprise shallow energy level donor impurities and shallow energy level acceptor impurities, andwherein a sum of a concentration of the deep energy level dopants and a ...

Intraluminal Stent and Preparation Method Therefor

An intraluminal stent () and a preparation method therefor are provided. The intraluminal stent () includes at least one sub-stent. The sub-stent includes at least a first wire () extending along a first spiral direction and at least a second wire () extending along a second spiral direction, and the first wire () and the second wire () extend in different directions to form several wire intersection points. The intraluminal stent () has several wrapped portions () to wrap two corresponding wire tail ends. A wrapping connector () is disposed at a periphery of the wrapped portion (). Two end portions of the wrapping connector () are firmly connected to regions corresponding to two ends of the wrapped portion (). The two wire tail ends of the wrapped portions () are wrapped by using the wrapping connector (). The stent () is less harmful to intraluminal tissues and a relatively strong tensile resistance. 1. An intraluminal stent , wherein the intraluminal stent comprises at least one sub-stent; the sub-stent has a radial compression form and a radial expansion form; the sub-stent has , in an axial direction , end portion regions at two ends and an intermediate region extending between the end portion regions; the sub-stent comprises at least a first wire extending along a first spiral direction and at least a second wire extending along a second spiral direction; and the first wire and the second wire extend in different directions to form several wire intersection points;wherein the intraluminal stent has several wrapped portions for wrapping two corresponding wire tail ends; a wrapping connector is disposed at a periphery of the wrapped portion; two end portions of the wrapping connector are firmly connected to regions corresponding to two ends of the wrapped portion; and the wrapped portion is disposed at a distance from an edge of at least one end portion of the sub-stent.2. The intraluminal stent according to claim 1 , wherein a separation distance between the ...

TRACTION APPARATUS AND TRACTION RING FOR TRACTION APPARATUS

A traction apparatus, comprising a clip portion () and a traction portion (), the traction portion containing a closed traction structure (); the closed traction structure being made from an elastic material; the clip portion comprising a main clip body () and a clip arm (); the main clip body being capable of passing through a biopsy channel () of an endoscope (), the clip arm being capable of clip the closed traction structure. Also disclosed is a traction ring used for the traction apparatus, the traction ring being a single closed traction structure or being formed by connecting several closed traction structures, the traction ring being made from an elastic material. 1. A traction apparatus , wherein the traction apparatus comprises a clip portion and a traction portion; the traction portion contains a closed traction structure; the closed traction structure is made of an elastic material; the clip portion comprises a main clip body and a clip arm; the main clip body is capable of passing through a biopsy channel of an endoscope; and the clip arm is capable of clip the closed traction structure.2. The traction apparatus according to claim 1 , wherein the closed traction structure is made of silicon rubber or a thermoplastic elastomer.3. The traction apparatus according to claim 1 , wherein the clip portion comprises one claim 1 , two claim 1 , or more closed traction structures.4. The traction apparatus according to claim 3 , wherein an elastic connection structure is provided between two or more closed traction structures.5. The traction apparatus according to claim 4 , wherein the elastic connection structure is an elastic linear structure.6. The traction apparatus according to claim 4 , wherein the elastic connection structure is an elastic ring structure.7. The traction apparatus according to claim 1 , wherein the closed traction structure is a combination of one or more of round shape claim 1 , triangular shape claim 1 , rhombic shape claim 1 , or square ...

Nonlinear optical device manufactured with 4h silicon carbide crystal

Provided is a nonlinear optical device manufactured with 4H silicon carbide crystal. The nonlinear optical crystal may be configured to alter at least a light beam ( 12 ) at a frequency to generate at least a light beam ( 16 ) at a further frequency different from the frequency. The nonlinear optical crystal comprises a 4H silicon carbide crystal ( 13 ). The nonlinear optical device is more compatible with practical applications in terms of outputting mid-infrared laser at high power and high quality and thus are more applicable in practice, because the 4H silicon carbide crystal has a relatively high laser induced damage threshold, a relatively broad transmissive band (0.38-5.9 μm and 6.6-7.08 μm), a relatively great 2 nd -order nonlinear optical coefficient (d 15 =6.7 pm/V), a relatively great birefringence, a high thermal conductivity (490 Wm −1 K −1 ), and a high chemical stability.

Endoscope end cap

An endoscope end cap, including a sleeve member, protrusion elements, and a movable sleeve. The sleeve member is connected to the front end of an endoscope, the sleeve member, the protrusion elements, and the movable sleeve are connected in sequence, and the movable sleeve can move freely on the outer surface of the endoscope. When the endoscope is inserted for examination, the end cap is easy to enter and does not scratch the digestive tract since the end cap has a cylinder-like structure which is smooth and has no angularity; when the endoscope is being withdrawn, the movable sleeve moves distally and abuts against the sleeve member, so as to support the protrusion elements to enable the protrusion elements to dilate the inner wall of the intestine, improving the quality of single endoscope examination, and reducing discomfort of a patient, operation risk, and operation time.

Medical drainage stent

A medical drainage stent that includes a stent body, and a proximal portion and a distal portion that are located at two ends of the stent body for connecting a first tissue wall and a second tissue wall in a juxtaposing manner. The stent body is fixed between the first tissue wall and the second tissue wall to provide a drainage channel. The proximal portion of the stent has N extension portions, where a fixed end of the extension portion is fixedly connected with an edge of a proximal end of the stent body, and the other end of the extension portion is a free end in a free state. Structures of the N extension portions at least partially protrude from the stent body in a radial direction, so that the proximal portion of the stent is fixed on the first tissue wall, where N is a positive integer.

Three-dimensional precise intracavitary radiotherapy method and system for treating tumours

Provided in the present invention is a three-dimensional precise intracavitary radiotherapy method and system for treating tumours, comprising the steps of: (1) lesion three-dimensional quantitative measurement and analysis of three-dimensional scanning image of the lesion cavity; (2) comprehensive analysis according to lesion three-dimensional quantitative measurement results and lesion characteristics to calculate the three-dimensional distribution of lesion radiation dose; and (3) according to the three-dimensional distribution diagram of radiation dose, selecting appropriate radiation sources and radiation dose to make a stent, and performing three-dimensional precise intracavitary radiotherapy. At the same time, also provided by the present invention is a system for achieving the above radiotherapy method. The present invention uses modern medical imaging three-dimensional reconstruction technology for realizing three-dimensional precise internal radiotherapy to treat tumours with an optimized radiation dose and protect normal tissues to an extreme.

THERMOPUNCTURE STENT IMPLANTATION DEVICE

A thermopuncture stent implantation device has a proximal end and a distal end, the distal end of a front handle is provided with an outer tube, an insulating middle tube is provided in the outer tube, a conductive part is provided in the insulating middle tube, a terminal of the proximal end of the conductive part is connected to an external power source, a boosting tube is provided between the proximal end of the outer tube and the insulating middle tube, the distal end of the boosting tube and the proximal end of the insulating middle tube are connected with each other, the distal end of the conductive part is provided with an insulating part, on which a conductive head connected with the conductive part is distributed; the stent, after being compressed, is located in a space between the distal end of the conductive part and the outer tube. 1. An thermopuncture stent implantation device , comprising: a proximal end and a distal end , the distal end of a front handle is provided with an outer tube , the outer tube extends from the proximal end to the distal end , an outer diameter of the distal end of the outer tube is less than or equal to 3.15 mm , an insulating middle tube is provided in the outer tube , the insulating middle tube extends from the proximal end to the distal end , a conductive part is provided in the insulating middle tube , the conductive part extends from the proximal end to the distal end , a terminal of the proximal end of the conductive part can be connected to an external power source; a boosting tube is provided between the proximal end of the outer tube and the insulating middle tube , the distal end of the boosting tube and the proximal end of the insulating middle tube are connected with each other; the distal end of the conductive part is provided with an insulating part , a conductive head is distributed on the insulating part , and the conductive head is connected with the conductive part to achieve a conductive function , and the ...

Guide Wire Joint

Disclosed is a guide wire joint, comprising: a first cover board ( 1 ), a second cover board ( 2 ), a connecting part ( 3 ) connecting the first cover board and the second cover board, and a connecting piece ( 4 ); the connecting piece ( 4 ) can connect the guide wire joint to a medical device; a side of the first cover board ( 1 ) and a side of the second cover board ( 2 ), both are away from the connecting part ( 3 ), are contacted with or separated from each other to adjust closing and opening of the guide wire joint. When the guide wire joint is closed, a guide wire passage ( 10 ) is formed between the first cover board ( 1 ) and the second cover board ( 2 ) allowing the guide wire to pass through and penetrate into a guide wire cavity of a medical device having a C-shaped groove; and when the guide wire joint is opened, the guide wire can be rapidly detached from the guide wire joint, and can be rapidly separated from the medical device.

Medical Device Implantation Apparatus

Provided is a medical device implantation apparatus, comprising: an outer sheath (), connected to a first portion of a handle () and extending from a proximal end to a distal end; a middle sheath (), the middle sheath () being arranged in the outer sheath (), and the middle sheath () being connected to a second portion of the handle (); an inner sheath (), the inner sheath () being allowed to pass through the middle sheath (), the inner sheath () being connected to a third portion of the handle (), and the inner sheath () being movable relative to the outer sheath (); outer casings (), with at least two outer casings being provided, and a distal end of the inner sheath () being respectively fixedly connected to the outer casings (); and a medical device, arranged around the inner sheath () and partially accommodated in the outer casings (). The medical device can be released by manipulating the third portion of the handle (). When the medical device is released, the first portion of the handle () is withdrawn towards the proximal end, and the medical device is partially released from the outer sheath (); the third portion of the handle () is then pushed towards the distal end, the medical device is separated from the outer casings (); and finally, the first portion of the handle () is withdrawn, and the medical device is released and implanted. 1. A medical device implantation apparatus , comprising:an outer sheath, connected to a first portion of a handle and extending from a proximal end to a distal end;a middle sheath, the middle sheath being arranged in the outer sheath, and the middle sheath being connected to a second portion of the handle;an inner sheath, the inner sheath being allowed to pass through the middle sheath, the inner sheath being connected to a third portion of the handle, and the inner sheath being movable relative to the outer sheath;outer casings, with at least two outer casings being provided, and a distal end of the inner sheath being ...

Limiting Device and Method for Using Same

The limiting device includes a clamping portion and a movable portion; the clamping portion and the movable portion are both annular structures, two ends of the clamping portion and the movable portion are respectively connected to form a connected double-ring structure, and the ring diameter of the movable portion is larger than that of the clamping portion. The limiting device is disposed on a core rod, the clamping portion and the core rod are in interference fit, and the movable portion and the core rod are in clearance fit. When the movable portion cooperates with the core rod, the limiting device may slide relative to the core rod; when the clamping portion cooperates with the core rod, the limiting device and the core rod are in a fixed state, and the limiting device cannot slide relative to the core rod, thus achieving the purpose of limiting.

TRACTION APPARATUS AND TRACTION RING FOR TRACTION APPARATUS

Traction apparatus and traction ring for traction apparatus

A traction apparatus, comprising a clamping portion (2) and a traction portion (1), the traction portion containing a closed traction structure (11), the closed traction structure being made from an elastic material, the clamping portion comprising clamping main bodies (23, 25) and clamping arms (24, 26), the clamping main bodies being capable of passing through a biopsy channel (4) of an endoscope (3), the clamping arms being capable of clamping the closed traction structure. Also disclosed is a traction ring for the traction apparatus, the traction ring being a single closed traction structure or being formed by connecting several closed traction structures, the traction ring being made from an elastic material.

MEDICAL DEVICE CONNECTOR

Stone extraction basket and double lumen end cap for stone extraction basket

Disclosed is a stone extraction basket, comprising a mesh basket (1), an outer tube (2) and an operation portion (10), wherein the mesh basket (1) is connected to the operation portion (10), and the operation portion (10) can control the mesh basket (1) to move; a proximal end of the outer tube (2) is connected to the operation portion (10), the outer tube axially extends from the proximal end to a distal end, and the distal end of the outer tube (2) is provided with a double lumen end cap (5); and a guide wire (4) passing through one lumen channel (B7) of the double lumen end cap (5), and the mesh basket (1) passes through the other lumen channel (A6) of the double lumen end cap (5). The stone extraction basket solves the existing technical problem of the mesh basket being hampered from removing a calculus and being withdrawn from the biliary tract because the guide wire is driven by the end cap at the distal end of the mesh basket.

Traction apparatus and traction ring for traction apparatus

A traction apparatus, comprising a clip portion (2) and a traction portion (1), the traction portion containing a closed traction structure (11); the closed traction structure being made from an elastic material; the clip portion comprising a main clip body (23, 25) and a clip arm (24, 26); the main clip body being capable of passing through a biopsy channel (4) of an endoscope (3), the clip arm being capable of clip the closed traction structure. Also disclosed is a traction ring used for the traction apparatus, the traction ring being a single closed traction structure or being formed by connecting several closed traction structures, the traction ring being made from an elastic material.

High quality silicon carbide seed crystal, silicon carbide crystal, silicon carbide substrate, and preparation method therefor

Provided are a high quality silicon carbide seed crystal, a silicon carbide crystal, a silicon carbide substrate, and a preparation method therefor. A high quality silicon carbide seed crystal is prepared, the dopant concentrations of a thermal insulation material, a graphite crucible, and a silicon carbide powder material are controlled, a specific crystal growth process and a wafer machining means are integrated, and a high quality silicon carbide substrate is obtained. The obtained silicon carbide substrate has a high crystalline quality and an extremely low amount of micropipes, screw dislocation density, and compound dislocation density; said substrate also has an extremely low p-type dopant concentration, exhibits superior electrical performance, and has a high surface quality.

Limiting device and method for using same

The present invention relates to a limiting device; the limiting device comprises a clamping portion and a movable portion; the clamping portion and the movable portion are both annular structures, two ends of the clamping portion and the movable portion are respectively connected to form a connected double-ring structure, and the ring diameter of the movable portion is larger than the ring diameter of the clamping portion. The limiting device in the present invention is disposed on a core rod, the clamping portion and the core rod are in interference fit, and the movable portion and the core rod are in clearance fit. When the movable portion cooperates with the core rod, the limiting device may slide relative to the core rod; when the clamping portion cooperates with the core rod, the limiting device and the core rod are in a fixed state, and the limiting device cannot slide relative to the core rod, thus achieving the purpose of limiting. The limiting device may quickly carry out positioning, is convenient to operate, and may still achieve a limiting function after being placed for a long period of time.

Limiting device and method for using same

The present invention relates to a limiting device; the limiting device comprises a clamping portion and a movable portion; the clamping portion and the movable portion are both annular structures, two ends of the clamping portion and the movable portion are respectively connected to form a connected double-ring structure, and the ring diameter of the movable portion is larger than the ring diameter of the clamping portion. The limiting device in the present invention is disposed on a core rod, the clamping portion and the core rod are in interference fit, and the movable portion and the core rod are in clearance fit. When the movable portion cooperates with the core rod, the limiting device may slide relative to the core rod; when the clamping portion cooperates with the core rod, the limiting device and the core rod are in a fixed state, and the limiting device cannot slide relative to the core rod, thus achieving the purpose of limiting. The limiting device may quickly carry out positioning, is convenient to operate, and may still achieve a limiting function after being placed for a long period of time.

Limiting device and method for using same

The present invention relates to a limiting device; the limiting device comprises a clamping portion and a movable portion; the clamping portion and the movable portion are both annular structures, two ends of the clamping portion and the movable portion are respectively connected to form a connected double-ring structure, and the ring diameter of the movable portion is larger than the ring diameter of the clamping portion. The limiting device in the present invention is disposed on a core rod, the clamping portion and the core rod are in interference fit, and the movable portion and the core rod are in clearance fit. When the movable portion cooperates with the core rod, the limiting device may slide relative to the core rod; when the clamping portion cooperates with the core rod, the limiting device and the core rod are in a fixed state, and the limiting device cannot slide relative to the core rod, thus achieving the purpose of limiting. The limiting device may quickly carry out positioning, is convenient to operate, and may still achieve a limiting function after being placed for a long period of time.

Guide wire joint

Disclosed is a guide wire joint, comprising: a first cover board (1), a second cover board (2), a connecting part (3) connecting the first cover board and the second cover board, and a connecting piece (4); the connecting piece (4) can connect the guide wire joint to a medical device; a side of the first cover board (1) and a side of the second cover board (2), both are away from the connecting part (3), are contacted with or separated from each other to adjust closing and opening of the guide wire joint. When the guide wire joint is closed, a guide wire passage (10) is formed between the first cover board (1) and the second cover board (2) allowing the guide wire to pass through and penetrate into a guide wire cavity of a medical device having a C-shaped groove; and when the guide wire joint is opened, the guide wire can be rapidly detached from the guide wire joint, and can be rapidly separated from the medical device.

Guide wire joint

Disclosed is a guide wire joint, comprising: a first cover board (1), a second cover board (2), a connecting part (3) connecting the first cover board and the second cover board, and a connecting piece (4); the connecting piece (4) can connect the guide wire joint to a medical device; a side of the first cover board (1) and a side of the second cover board (2), both are away from the connecting part (3), are contacted with or separated from each other to adjust closing and opening of the guide wire joint. When the guide wire joint is closed, a cavity (10) is formed between the first cover board (1) and the second cover board (2) allowing the guide wire to pass through and penetrate into a guide wire cavity of a medical device having a C-shaped groove; and when the guide wire joint is opened, the guide wire can be rapidly detached from the guide wire joint, and can be rapidly separated from the medical device.

Guide wire joint

Disclosed is a guide wire joint, comprising: a first cover board (1), a second cover board (2), a connecting part (3) connecting the first cover board and the second cover board, and a connecting piece (4); the connecting piece (4) can connect the guide wire joint to a medical device; a side of the first cover board (1) and a side of the second cover board (2), both are away from the connecting part (3), are contacted with or separated from each other to adjust closing and opening of the guide wire joint. When the guide wire joint is closed, a cavity (10) is formed between the first cover board (1) and the second cover board (2) allowing the guide wire to pass through and penetrate into a guide wire cavity of a medical device having a C-shaped groove; and when the guide wire joint is opened, the guide wire can be rapidly detached from the guide wire joint, and can be rapidly separated from the medical device.

Endoscope end cap

An endoscope end cap, including a sleeve member, protrusion elements, and a movable sleeve. The sleeve member is connected to the front end of an endoscope, the sleeve member, the protrusion elements, and the movable sleeve are connected in sequence, and the movable sleeve can move freely on the outer surface of the endoscope. When the endoscope is inserted for examination, the end cap is easy to enter and does not scratch the digestive tract since the end cap has a cylinder-like structure which is smooth and has no angularity; when the endoscope is being withdrawn, the movable sleeve moves distally and abuts against the sleeve member, so as to support the protrusion elements to enable the protrusion elements to dilate the inner wall of the intestine, improving the quality of single endoscope examination, and reducing discomfort of a patient, operation risk, and operation time.

Medical drainage stent

A medical drainage stent, comprising: a stent body (1), and a proximal end portion (2) and a distal end portion (3) which are located at two ends of the stent body (1), so as to connect a first tissue wall (6) and a second tissue wall (7) in a juxtaposed manner. The stent body (1) is fixed between the first tissue wall (6) and the second tissue wall (7) so as to provide a drainage cavity (5). The proximal end portion (2) of the stent has N extension portions (9), a fixed end (92) of each extension portion (9) is fixedly connected to a proximal edge of the stent body (1), and the other end of the extension portion (9) is a free end (91) in a free state. At least some structures of the N extension portions (9) protrude beyond the stent body (1) in a radial direction, so that the proximal end portion (2) of the stent is fixed to the first tissue wall (6), N being a positive integer. On the basis of the design of the stent, the problem in the prior art that the stent easily falls into the abdominal cavity when released can be effectively solved, so that the difficulty and the risk of surgery are reduced.

Medical drainage stent

PCT/CN2019/126083 Our Ref.: OP2130165UAU3-P3X203 ABSTRACT A medical drainage stent, comprising: a stent body (1), and a proximal portion (2) and a distal portion (3) that are located at two ends of the stent body (1) for connecting a first tissue wall (6) and a second tissue wall (7) in a juxtaposing manner. The stent body (1) is fixed between 5 the first tissue wall (6) and the second tissue wall (7) to provide a drainage channel (5). The proximal portion (2) of the stent has N extension portions (9), wherein a fixed end (92) of the extension portion (9) is fixedly connected with an edge of a proximal end of the stent body (1), and the other end of the extension portion (9) is a free end (91) in a free state. Structures of the N extension portions (9) at least partially protrude from the stent body (1) in a radial direction, so 0 that the proximal portion (2) of the stent is fixed on the first tissue wall (6), wherein N is a positive integer. On the basis of this stent design, a problem that an existing stent is easy to fall into an abdominal cavity while being released may be effectively resolved, thereby effectively reducing difficulty and risk of a surgery. (FIG. 5) 5 20 PCT/CN2019/126083 Our Ref: OP2130165UAU3-P3X203 -92 -91 11 3 FIG.5 3/8

Nonlinear optical device manufactured with 4H silicon carbide crystal

Provided is a nonlinear optical device manufactured with 4H silicon carbide crystal. The nonlinear optical crystal may be configured to alter at least a light beam ( 12 ) at a frequency to generate at least a light beam ( 16 ) at a further frequency different from the frequency. The nonlinear optical crystal comprises a 4H silicon carbide crystal ( 13 ). The nonlinear optical device is more compatible with practical applications in terms of outputting mid-infrared laser at high power and high quality and thus are more applicable in practice, because the 4H silicon carbide crystal has a relatively high laser induced damage threshold, a relatively broad transmissive band (0.38-5.9 μm and 6.6-7.08 μm), a relatively great 2 nd -order nonlinear optical coefficient (d 15 =6.7 pm/V), a relatively great birefringence, a high thermal conductivity (490 Wm −1 K −1 ), and a high chemical stability.

Medical device implantation apparatus

Provided is a medical device implantation apparatus, comprising: an outer sheath, connected to a first portion of a handle and extending from a proximal end to a distal end; a middle sheath, the middle sheath being arranged in the outer sheath, and the middle sheath being connected to a second portion of the handle; an inner sheath, the inner sheath being allowed to pass through the middle sheath, the inner sheath being connected to a third portion of the handle, and the inner sheath being movable relative to the outer sheath; outer casings, with at least two outer casings being provided, and a distal end of the inner sheath being respectively fixedly connected to the outer casings; and a medical device, arranged around the inner sheath and partially accommodated in the outer casings.

Endoscope end cap

An endoscope end cap, comprising a sleeve member (1, 21, 31), protrusion elements (2, 22, 32), and a movable sleeve (3, 23, 33). The sleeve member (1, 21, 31) is connected to the front end of an endoscope, the sleeve member (1, 21, 31), the protrusion elements (2, 22, 32), and the movable sleeve (3, 23, 33) are connected in sequence, and the movable sleeve (3, 23, 33) can move freely on the outer surface of the endoscope. When the endoscope is inserted for examination, the end cap (101, 201, 301) is easy to enter and does not scratch the digestive tract since the end cap has a cylinder-like structure which is smooth and has no angularity; when the endoscope is being withdrawn, the movable sleeve (3, 23, 33) moves distally and abuts against the sleeve member (1, 21, 31), so as to support the protrusion elements (2, 22, 32) to enable the protrusion elements to dilate the inner wall of the intestine, improving the quality of single endoscope examination, and reducing discomfort of a patient, operation risk, and operation time.

Endoscope end cap

An endoscope end cap, comprising a sleeve member (1, 21, 31), protrusion elements (2, 22, 32), and a movable sleeve (3, 23, 33). The sleeve member (1, 21, 31) is connected to the front end of an endoscope, the sleeve member (1, 21, 31), the protrusion elements (2, 22, 32), and the movable sleeve (3, 23, 33) are connected in sequence, and the movable sleeve (3, 23, 33) can move freely on the outer surface of the endoscope. When the endoscope is inserted for examination, the end cap (101, 201, 301) is easy to enter and does not scratch the digestive tract since the end cap has a cylinder-like structure which is smooth and has no angularity; when the endoscope is being withdrawn, the movable sleeve (3, 23, 33) moves distally and abuts against the sleeve member (1, 21, 31), so as to support the protrusion elements (2, 22, 32) to enable the protrusion elements to dilate the inner wall of the intestine, improving the quality of single endoscope examination, and reducing discomfort of a patient, operation risk, and operation time.

Endoscope end cap

An endoscope end cap, comprising a sleeve member (1, 21, 31), protrusion elements (2, 22, 32), and a movable sleeve (3, 23, 33). The sleeve member (1, 21, 31) is connected to the front end of an endoscope, the sleeve member (1, 21, 31), the protrusion elements (2, 22, 32), and the movable sleeve (3, 23, 33) are connected in sequence, and the movable sleeve (3, 23, 33) can move freely on the outer surface of the endoscope. When the endoscope is inserted for examination, the end cap (101, 201, 301) is easy to enter and does not scratch the digestive tract since the end cap has a cylinder-like structure which is smooth and has no angularity; when the endoscope is being withdrawn, the movable sleeve (3, 23, 33) moves distally and abuts against the sleeve member (1, 21, 31), so as to support the protrusion elements (2, 22, 32) to enable the protrusion elements to dilate the inner wall of the intestine, improving the quality of single endoscope examination, and reducing discomfort of a patient, operation risk, and operation time.

High quality silicon carbide seed crystal, silicon carbide crystal, silicon carbide substrate, and preparation method therefor

Position limiting device for a surgical device and method for using same

Silicon carbide single crystal wafer, crystal, preparation methods therefor, and semiconductor device

A silicon carbide single crystal wafer and a preparation method therefor, a silicon carbide crystal and a preparation method therefor, and a semiconductor device. The surface of the silicon carbide single crystal wafer is such that an included angle between a normal direction and a c direction is 0-8 degrees, and aggregated dislocations on the silicon carbide single crystal wafer are less than 300/cm 2 ; the aggregated dislocation is a dislocation aggregated condition in which the distance between the geometric centers of any two corrosion pits in the corrosion pits obtained after corrosion of melted KOH is less than 80 microns. Even if the dislocation density is relatively high, the aggregated dislocation density is relatively small, thereby increasing the yield of a silicon carbide-based devices.

Silicon carbide single crystal wafer, crystal, preparation methods therefor, and semiconductor device

Silicon carbide single crystal wafer, crystal, preparation methods therefor, and semiconductor device

A silicon carbide single crystal wafer and a preparation method therefor, a silicon carbide crystal and a preparation method therefor, and a semiconductor device. The surface of the silicon carbide single crystal wafer is such that an included angle between a normal direction and a c direction is 0-8 degrees, and aggregated dislocations on the silicon carbide single crystal wafer are less than 300/cm 2 ; the aggregated dislocation is a dislocation aggregated condition in which the distance between the geometric centers of any two corrosion pits in the corrosion pits obtained after corrosion of melted KOH is less than 80 microns. Even if the dislocation density is relatively high, the aggregated dislocation density is relatively small, thereby increasing the yield of a silicon carbide-based devices.

Guide wire joint

Disclosed is a guide wire joint, comprising: a first cover board (1), a second cover board (2), a connecting part (3) connecting the first cover board and the second cover board, and a connecting piece (4); the connecting piece (4) can connect the guide wire joint to a medical device; a side of the first cover board (1) and a side of the second cover board (2), both are away from the connecting part (3), are contacted with or separated from each other to adjust closing and opening of the guide wire joint. When the guide wire joint is closed, a cavity (10) is formed between the first cover board (1) and the second cover board (2) allowing the guide wire to pass through and penetrate into a guide wire cavity of a medical device having a C-shaped groove; and when the guide wire joint is opened, the guide wire can be rapidly detached from the guide wire joint, and can be rapidly separated from the medical device.

Position limiting device for a surgical device and method for using same

一种用于促进毛发生长速率及移植成活率的便携式装置

本实用新型涉及一种用于促进毛发生长速率及移植成活率的便携式装置，包括负压调节装置、通气装置和接触佩戴装置，所述负压调节装置和所述通气装置相连通，所述接触佩戴装置和所述通气装置相连通，所述接触佩戴装置和头部接触。佩戴装置和头部接触，负压调节装置通过通气装置使佩戴装置内形成负压，由此牵拉佩戴装置内的皮肤，让其处于负压的应力环境下，从而影响毛囊代谢周期及血运，促进毛发生长，缩短各类毛发移植患者“尴尬期”,提高瘢痕性脱发患者毛发移植患者毛囊成活率；同时，该装置也能够促进正常人群毛发增长速率，通过设定该装置安全工作负压区间，可实现患者在家自主操作，提高便捷性。

Aparato de traccion y anillo de traccion para aparato de traccion

Medical connecting device

A medical connecting device, having a proximal end and a distal end; the medical connecting device comprises an insulating layer (3, 123, 222, 322) and a spiral tube (2, 124, 223, 323), the insulating layer (3, 123, 222, 322) covering the outermost layer of the whole device; the spiral tube (2, 124, 223, 323) has a conductive hollow tubular structure; and the spiral tube (2, 124, 223, 323) has a spiral structure, and the pitch of the spiral structure gradually changes in the direction from the proximal end to the distal end. The medical connecting device is able to integrate multiple functions such as electrical conductivity, hydrotubation, powder spraying, vacuum suction, sealing, insulation, and support.

Medical Connecting Device

A medical connecting device, having a proximal end and a distal end; the medical connecting device includes an insulating layer (3, 123, 222, 322) and a spiral tube (2, 124, 223, 323), the insulating layer (3, 123, 222, 322) covering the outermost layer of the whole device; the spiral tube (2, 124, 223, 323) has a conductive hollow tubular structure; and the spiral tube (2, 124, 223, 323) has a spiral structure, and a pitch of the spiral structure gradually changes in the direction from the proximal end to the distal end. The medical connecting device is able to integrate multiple functions such as electricity conducting, liquid passage, powder spraying, negative pressure suction, sealing, insulation, and support.

Monocrystalline silicon carbide substrate, method for manufacturing the same, and semiconductor device

A monocrystalline SiC substrate comprising a first surface and a second surface. The first surface comprises pinning regions and a device region. Each of the pinning regions is configured to provide a potential well which is capable to attract dislocations from a region surrounding said pinning region. The device region is configured to provide a part of the monocrystalline SiC substrate for manufacturing a semiconductor device. The device region is surrounded by the pinning regions, and a density of dislocations in a central portion of the device region is smaller than a density of dislocations in an edge of the device region due to the pinning regions. The pinning regions surrounding the device region attracts dislocations of the device region into the edge portion, so that the density of dislocations in the central portion is reduced. A yield of the semiconductor devices is improved.

Semi-insulating silicon carbide monocrystal and method of growing the same

A semi-insulating silicon carbide monocrystal and a method of growing the same are disclosed. The semi-insulating silicon carbide monocrystal comprises intrinsic impurities, deep energy level dopants and intrinsic point defects. The intrinsic impurities are introduced unintentionally during manufacture of the silicon carbide monocrystal, and the deep energy level dopants and the intrinsic point defects are doped or introduced intentionally to compensate for the intrinsic impurities. The intrinsic impurities include shallow energy level donor impurities and shallow energy level acceptor impurities. A sum of a concentration of the deep energy level dopants and a concentration of the intrinsic point defects is greater than a difference between a concentration of the shallow energy level donor impurities and a concentration of the shallow energy level acceptor impurities, and the concentration of the intrinsic point defects is less than the concentration of the deep energy level dopants. The semi-insulating SiC monocrystal has resistivity greater than 1×10 5 Ω·cm at room temperature, and its electrical performances and crystal quality satisfy requirements for manufacture of microwave devices. The deep energy level dopants and the intrinsic point defects jointly serve to compensate the intrinsic impurities, so as to obtain a high quality semi-insulating single crystal.