Pump chamber configured to contain a residual fluid volume for inhibiting the pumping of a gas

摘要

The present invention involves, in some embodiments, medical systems for pumping fluid using a medical-grade cartridge configured for use in a reusable fluid medical apparatus to move liquids through the cartridge. The cartridge includes a membrane defining a chamber. The system includes a pressure source able to be placed in pneumatic communication with the chamber to adjust gas pressure therein. The system further includes a processor configured to perform a dry integrity test based on adjustment and measurement of fluid pressures in the chamber in which neither side of the member is exposed to liquid during test to determine whether a fluid leak exists through the membrane.

主权项

1. A medical system for pumping fluid using a medical-grade cartridge configured for use in a reusable fluid medical apparatus to move liquids through the cartridge, comprising:
the medical-grade cartridge having a membrane defining a first chamber when mated to the reusable fluid medical apparatus; a pressure source configured to be capable of being in pneumatic communication with the first chamber, wherein the pressure source is configured to adjust pressure of a gas capable of being in pneumatic communication with the membrane; a pressure transducer configured to measure a pressure in operative communication with the pressure source; a valve configured to isolate the first chamber from the pressure source and operatively connect the pressure source to the first chamber; and a processor of the medical system configured to perform a dry integrity test in which neither side of the membrane is exposed to liquid during the dry integrity test and in which the first chamber is in fluid communication with the surroundings of the cartridge, the processor configured to:
actuate the valve between a first position and a second position;adjust the pressure of the fluid of the pressure source;measure a first pressure of the pressure transducer to generate a first pressure value when the valve is in the first position;measure a second pressure of the pressure transducer to generate a second pressure value after the valve is in the second position; anddetermine whether a fluid leak exists through the membrane based on a pressure difference indicated by the first and second pressure values.