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Medical fluid cassettes and related systems and methods

  • US 9,421,314 B2
  • Filed: 07/15/2010
  • Issued: 08/23/2016
  • Est. Priority Date: 07/15/2009
  • Status: Active Grant
First Claim
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1. A medical fluid pumping system, comprising:

  • a medical fluid pumping machine defining a cassette enclosure, the medical fluid pumping machine comprising a movable piston; and

    a medical fluid cassette configured to be disposed within the cassette enclosure of the medical fluid pumping machine, the medical fluid cassette comprisinga base;

    a membrane attached to the base, the membrane and a region of the base cooperating to define a fluid pump chamber, the cassette positionable within the cassette enclosure of the medical fluid pumping machine so that the membrane faces the piston and the membrane can be moved by the piston to decrease a volume of the fluid pump chamber; and

    a member disposed within the fluid pump chamber and configured to apply an outward force to an inner surface of the membrane to increase the volume of the fluid pump chamber, the member comprising a first portion defining a recess configured to receive the piston.

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