20-09-2018 дата публикации
Номер: US20180264491A1
An apparatus and method for precisely dispensing liquid fluid from a container are disclosed. The apparatus comprises a metering unit having a gas feedthrough channel with a first end extending in a gas containing part of the chamber and a second end opposite the first end extending outside the chamber, the metering unit further comprising a flow sensing assembly configured to measure a gas pressure differential Δp and/or gas flow V{dot over ( )} within the gas feedthrough channel and to introduce or release a determined volume of gas in the chamber to dispense a controlled volume of liquid from the chamber. 1. An apparatus for dispensing or aspirating a predetermined volume of liquid fluid in a container , said container comprising a chamber having an internal volume V and at least an opening for granting communication with the chamber , the apparatus being configured to be connectable to the container about the opening thereof and comprising:at least one connecting port configured to connect the apparatus to the container about the opening in a gas and liquid tight manner;a dispensing unit configured to dispense and/or aspirate a predetermined volume of liquid fluid from the chamber, said dispensing unit comprising a dispensing or aspirating channel having a first end in fluidic communication with a liquid containing part of the chamber and a second end opposite the first end extending outside the container for dispensing or aspirating a metered amount of liquid fluid, and liquid flow controlling means being arranged on the dispensing or aspirating channel to open/close said channel respectively; anda metering unit configured to meter a flow of compressible gas injected or released from the chamber,said dispensing unit and metering unit being in fluidic communication with said chamber through said at least one connecting port,{'sub': 'gas', 'wherein the metering unit comprises a gas feedthrough channel having a first end in fluidic communication with a gas ...
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