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Dual plunger cassette pump

  • US 5,718,569 A
  • Filed: 01/11/1996
  • Issued: 02/17/1998
  • Est. Priority Date: 01/11/1996
  • Status: Expired due to Term
First Claim
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1. A cassette for use in a medical pump, comprising:

  • (a) a housing having an inlet port and an outlet port, said housing including a front portion and a rear portion between which is sealed an elastomeric membrane that cooperates with the housing to define a fluid path within the housing, between the inlet port and the outlet port, said fluid path including two parallel flow segments;

    (b) two pumping chambers disposed in the parallel flow segments of the fluid path, one side of each pumping chamber comprising a different portion of the elastomeric membrane;

    (c) a plurality of valves disposed in the parallel flow segments of the fluid path to control fluid flow into and out of the pumping chambers, a repetitive displacement of the elastomeric membrane into the pumping chambers in sequence forcing fluid from the pumping chambers and through the outlet port in a continuous flow; and

    (d) said elastomeric membrane being partially displaced into the two pumping chambers when the cassette is inserted into the pump to ensure that the different portions of the elastomeric membrane comprising said one side of each of said pumping chambers are always under tension during the repetitive displacement of the elastomeric membrane.

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