Patent ID: 8172789

Claim:
A peritoneal dialysis system comprising: a removable cassette defining first and second flexible pump chambers and first and second pressure sensing areas that are fluidly connected to the first and second pump chambers, respectively; and a peritoneal dialysis machine configured to secure the removable cassette, the peritoneal dialysis machine including (i) first and second pumps configured to be moved relative to the removable cassette to force peritoneal dialysis fluid out of the first removable pump chamber into a peritoneal cavity of a patient, and draw peritoneal dialysis fluid into the second removable pump chamber during operation of the peritoneal dialysis system, (ii) first and second pressure sensors positioned to align with and to contact the first and second pressure sensing areas, respectively, of the removable cassette when the removable cassette is secured within the peritoneal dialysis machine, and (iii) a controller connected to the first and second pressure sensors and adapted to change the operation of the peritoneal dialysis machine in response to changes in pressure sensed by the pressure sensors, wherein the first and second pressure sensors and the first and second pressure sensing areas are arranged so that the first pressure sensor measures a pressure of fluid in a first fluid passage between the first pump chamber and the patient during operation of the peritoneal dialysis system, and the second pressure sensor measures a pressure of fluid in a fluid passage between the second pump chamber and the patient during operation of the peritoneal dialysis system.