Medical fluid machine with air purging pump

A medical fluid apparatus, comprising:

• a diaphragm pump having a wall and a membrane connected to the wall and forming a fluid-receiving chamber having a single inlet/outlet port to a valve manifold of the apparatus;
• a piston connected to the membrane;
• a source of medical fluid connected through tubing to an inlet of the diaphragm pump the valve manifold;
• an outlet of the diaphragm pump valve manifold connected to a patient and to an entrained air drain;
• and
• an air sensor for monitoring a presence of air in the medical fluid or in the chamber, wherein the medical fluid is pumped to a patient if no air is detected in the chamber or in the fluid by urging the membrane toward the wall by extending the piston;
• and
• wherein the medical fluid is pumped through the outlet to the an entrained air drain if air is detected in the chamber or in the fluid, wherein the entrained air drain is a destination different from the patient, by urging the membrane toward the wall by extending the piston.

A medical fluid apparatus, comprising:

• a cassette with at least one diaphragm pump for pumping a medical fluid, wherein the at least one diaphragm pump comprises a wall and a membrane forming a fluid-receiving chamber, the chamber having a single inlet/outlet port;
• a valve manifold connected to the single inlet/outlet port;
• a piston connected to the membrane, wherein the diaphragm pump operates by drawing the medical fluid into the diaphragm pump by retracting the membrane from the wall and subsequently urging the membrane toward the wall using the piston;
• a source of medical fluid connected to an inlet of the diaphragm pump the valve manifold;
• a first valve connecting an outlet of the pump the valve manifold to a patient;
• a second valve connecting the outlet of the pump valve manifold to an entrained air destination, wherein the entrained air destination is different from the patient;
• and
• an air sensor for checking for air in the medical fluid,
• wherein if no air is detected, the medical fluid is pumped through the outlet of the pump to the patient and if air is detected, the medical fluid is pumped through the outlet of the pump to an the entrained air destination, wherein the entrained air destination is different from the patient.