AUTOMATED DIALYSIS SYSTEM USING PISTON AND NEGATIVE PRESSURE

摘要

A peritoneal dialysis system is provided that includes a hardware unit, a disposable unit received by the hardware unit, and a controller. The hardware unit includes a recessed area, a piston having a contact surface, a pneumatic source for supplying a negative pressure, and an actuator configured to move the contact surface of the piston into and out of at least a portion of the recessed area. The disposable unit includes an outer member fitted at least partially within the recessed area of the hardware unit and a moveable membrane positioned between the contact surface of the piston and the outer member when the disposable unit is received by the hardware unit. The controller is configured to cause the pneumatic source to apply the negative pressure to the moveable membrane so as to conform the moveable membrane to a shape of the contact surface of the piston and follow the contact surface when the piston is moved towards and away from the outer member fitted at least partially within the recessed area.

主权项

1. A peritoneal dialysis system comprising:
a hardware unit including
a recessed area,a solid pump piston including a solid piston shaft mechanically attached to a solid piston head, the solid pump piston configured to translate back-and-forth within the recessed area, the solid piston head having a contact surface defining a curved shape,a pneumatic source for supplying a negative pressure, andan actuator connected operably to the solid pump piston and configured to move the contact surface of the solid piston head into and out of the recessed area; a disposable unit received by the hardware unit, the disposable unit including
an outer member fitted at least partially within the recessed area of the hardware unit, anda moveable membrane positioned between the contact surface of the solid piston head and the outer member when the disposable unit is received at least partially within the recessed area; and a controller configured to cause the pneumatic source to apply the negative pressure to the moveable membrane so as to (i) conform the moveable membrane to the curved shape of the contact surface of the solid piston head and (ii) follow the curved shape of the contact surface of the solid piston head when the solid pump piston is moved towards and away from the outer member of the disposable unit when the unit is fitted at least partially within the recessed area.