Cassette system for peritoneal dialysis machine

A peritoneal dialysis (PD) system comprising:

• a disposable PD cassette comprising
• a base having a substantially planar portion and a dome-shaped protrusion extending from the substantially planar portion, the dome-shaped protrusion defining a recessed region,
• a flexible membrane attached to the base and covering the recessed region of the dome-shaped protrusion to form a pumping chamber between the flexible membrane and the recessed region of the dome-shaped protrusion, and
• a plurality of tubing connectors positioned along one edge of the PD cassette;
• and
• a PD machine comprising
• a deck having a plurality of openings,
• a door hinged from one side to the deck, the door and the deck being arranged so that when the door is closed over the deck, the door and the deck cooperate to form a cassette compartment configured to receive the disposable PD cassette therein, and the door having a cylindrical recess positioned to receive the dome-shaped protrusion of the base of the disposable PD cassette when the disposable PD cassette is disposed in the cassette compartment of the PD machine with the door closed,
• a piston head at least partially disposed within one of the openings of the deck, the piston head being aligned with the pumping chamber of the disposable PD cassette when the disposable PD cassette is disposed in the cassette compartment of the PD machine, and
• an inflatable bladder configured to compress the substantially planar portion of the base of the disposable PD cassette between the deck and the door of the PD machine when the disposable PD cassette is disposed in the cassette compartment of the PD machine with the door closed and the inflatable bladder is inflated.