Peritoneal dialysis system using cylinder and optionally air pump

Abstract

In one example, a control unit causes (i) a second pneumatic valve and a source fluid valve to open and a linear actuator to move a piston head into a first cylinder chamber so as to create a negative pressure in a pneumatic pump chamber, pulling source fluid into a fluid pump chamber and (ii) a first pneumatic valve and a destination fluid valve to open and the linear actuator to move the piston head into the first cylinder chamber, pushing the source fluid through the destination fluid valve, the control unit using a pressure sensor reading to control the linear actuator so that a final pressure for (ii) at least substantially equals an initial pressure for (ii), such that a volume of space corresponding to the movement of piston head within the cylinder during (ii) equals a volume of the source fluid delivered from fluid pump chamber.

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