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Medical fluid pumping systems and related devices and methods

  • US 10,143,791 B2
  • Filed: 09/30/2015
  • Issued: 12/04/2018
  • Est. Priority Date: 04/21/2011
  • Status: Active Grant
First Claim
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1. A medical fluid pumping machine comprising:

  • a piston head that can be linearly displaced, the piston head comprising a latch secured to a body portion of the piston head, the latch slidable relative to the body portion between a retracted position and an extended position in which an engagement surface of the latch is positioned radially outward of a perimeter of the body portion, the piston head being configured to be disposed within a recess defined by a fastening member of a medical fluid cassette, and the engagement surface of the latch being configured to engage an engagement surface of the fastening member of the medical fluid cassette when the piston head is disposed in the recess such that, when the piston head is disposed in the recess and is moved linearly away from a base of the cassette with the latch in the extended position, the engagement surface of the latch of the piston head is engaged with the engagement surface of the fastening member and pulls the fastening member and a flexible membrane to which the fastening member is attached away from the base to increase a volume of a fluid pump chamber defined in the cassette between the flexible membrane and the base.

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