System, method, and apparatus for utilizing a pumping cassette

摘要

The present invention involves, in some embodiments, systems and methods for pumping fluid into or out of a patient via a cartridge. The cartridge may include a membrane defining a chamber and mechanisms to supply, measure and control pressure in the chamber. The system further includes a processor that can be configured to compare certain pressure measurements to each other to facilitate determining if an error condition exists in the medical system if the difference between measurements is greater than a threshold. In certain cases the error condition may indicate leakage of the membrane, for example due to a pinhole in the membrane.

主权项

1. A medical system for pumping fluid into or out of a patient via a cartridge coupled to a pump drive system, the medical system comprising:
a membrane of the cartridge defining a chamber of the pump drive system when the cartridge is coupled to the pump drive system; a pressure source in fluid communication with the chamber, wherein the pump drive system is configured to adjust a pressure of the pressure source; a pressure transducer configured to measure a pressure associated with the pressure-source; a valve configured to isolate the chamber or operatively connect the pressure source to the chamber; and a processor configured to perform a dry cartridge integrity test before filling the cartridge with fluid comprising:
adjusting the pressure of the pressure source to a predetermined value with one or more flowpaths of the cartridge open to the surroundings;connecting the pressure source to the chamber;measuring a first pressure value of the pressure transducer;measuring a second pressure value of the pressure transducer after a predetermined amount of time;determining a difference by comparing the first and second pressure values to each other; anddetermining that an error condition exists in the medical system if the difference is greater than a threshold value.