Patent ID: 8066671
Filing Date: 2011-11-29
Classification: A61M

Abstract:
1. A peritoneal dialysis system comprising: a hardware unit including a piston having a contact surface, a pneumatic source for supplying a negative pressure, and a stepper motor configured to move the piston; and a disposable unit received by the hardware unit, the disposable unit including a moveable membrane operable with the contact surface of the piston, the piston moveable towards and away from the disposable unit, wherein (i) the piston and the membrane are positioned relative to each other and (ii) the pneumatic source of the hardware unit is configured to apply the negative pressure to the moveable membrane of the disposable unit so that the negative pressure causes the moveable membrane to contact and conform to a shape of the contact surface and to follow the piston as the piston is moved away from the disposable unit by the stepper motor, and wherein the shape-contacted membrane moves with the piston as the piston is moved into the disposable unit by the stepper motor.