AUTOMATED PERITONEAL DIALYSIS SYSTEM USING STEPPER MOTOR

摘要

An embodiment of a peritoneal dialysis system includes an enclosure, a door hingedly attached to the enclosure, a stepper motor housed by the enclosure, a solid pump piston in operable communication with the stepper motor and including a solid pump shaft attached to or integrally formed with a solid pump head, and a disposable unit contacting the enclosure and the door. The disposable unit includes a moveable membrane operable with the solid pump head. The stepper motor is configured to move the solid pump head towards and away from the disposable unit. The system further includes a position detection apparatus operable with the stepper motor and located to provide an output indicative of a position of the solid pump head relative to a reference position.

主权项

1. A peritoneal dialysis system comprising:
an enclosure; a stepper motor housed by the enclosure; a solid pump piston including a solid piston shaft attached to or integrally formed with a solid pump head, the solid pump piston 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 structured and arranged to allow the flexible membrane to move beyond a relaxed position of the flexible membrane, the enclosure structured and arranged to receive the disposable unit such that the stepper motor can move the solid pump head towards and away from the disposable unit to allow (i) the flexible membrane to move outwardly from the rigid piece as the solid pump head is moved away from the disposable unit, and (ii) the flexible membrane to move within the rigid piece as the solid pump head is moved towards the disposable unit; and an encoder operable with the stepper motor, the encoder configured to provide an output indicative of a position of the solid pump head after the solid pump head has moved towards or away from the disposable unit.