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Medical fluid cassettes and related systems and methods

  • US 9,610,392 B2
  • Filed: 06/08/2012
  • Issued: 04/04/2017
  • Est. Priority Date: 06/08/2012
  • Status: Active Grant
First Claim
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1. A medical fluid cassette, comprising:

  • a base having a first side and a second side opposite the first side, the base comprising a first region comprising at least one channel recessed into the first side of the base, the base further comprising a second region comprising a pump recess;

    a first flexible membrane positioned on the first side of the base so as to overlie the at least one channel, the first membrane configured to cooperate with the at least one channel to form at least one fluid pathway on the first side of the base, the fluid pathway formed with and between a surface of the base and the first flexible membrane, the first flexible membrane surrounding a peripheral portion of the pump recess on the first side of the base; and

    a second flexible membrane positioned on the first side of the base so as to overlie the pump recess to form a fluid pump chamber on the first side of the base, the fluid pump chamber formed with and between the surface of the base and the second flexible membrane, the second membrane having a flexibility that allows the second membrane to be depressed toward the second region of the base so as to substantially conform to the pump recess to expel fluid from the fluid pump chamber, and the second membrane being more resilient than the first membrane and being configured to elastically rebound away from the base when a force used to press the second membrane toward the base is released to permit dialysis solution to be drawn into the pump recess.

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