Patent ID: 8114276

Claim:
A dialysis machine comprising: a dialysis instrument having at least one peristaltic pump actuator and first and second pneumatic valve actuators; and a disposable cassette operable with the dialysis instrument, the disposable cassette including a rigid portion, at least one pump tube extending from the rigid portion for operation with the at least one peristaltic pump actuator, the rigid portion defining first and second valve chambers in operable communication with the first and second valve actuators, respectively, the first and second valve chambers communicating fluidly with each other, at least the first valve chamber communicating fluidly with a compliance chamber, at least a portion of the compliance chamber being flexible for absorbing energy from a pneumatic closing pressure applied to close the first valve chamber, the compliance chamber positioned and arranged so that the absorbing of the energy tends to prevent the pneumatic closing pressure from opening an existing closure of the second valve chamber.