Patent ID: 7789849
Filing Date: 2010-09-07
Classification: A61M

Abstract:
1. A peritoneal dialysis system comprising: an enclosure; a stepper motor housed by the enclosure; a pump head in operable communication with the stepper motor; a disposable unit including at least one flexible membrane attached to a rigid piece, the enclosure and the disposable unit configured to allow a negative pressure to exist between the pump head and the flexible membrane and to pull the flexible membrane to a position that extends beyond a relaxed position of the membrane, the enclosure configured to receive the disposable unit such that the stepper motor can move the pump head towards and away from the flexible membrane to cause, an encoder operable with the stepper motor to indicate a position of the pump head after the pump head has moved towards or away from the flexible membrane, the encoder configured to indicate the pump head position after a power loss.