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Solution pumping system including disposable pump cassette

  • US 5,062,774 A
  • Filed: 12/01/1989
  • Issued: 11/05/1991
  • Est. Priority Date: 12/01/1989
  • Status: Expired due to Term
First Claim
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1. A pump cassette for use with an associated pump driver having a reciprocable pump plunger and a plurality of valve actuators, said pump cassette comprising:

  • a cassette body including a plate-like front body member, and a juxtaposed, plate-like rear body member; and

    elastomeric diaphragm means positioned between said front and rear body members, said cassette body and said diaphragm means together providing said pump cassette with a plurality of liquid inlets including at least one downstream inlet at least one liquid outlet, a liquid flow path for joining said liquid inlets and outlet in fluid communication, and pump means operably driven by the pump plunger of said associated pump driver for pumping liquid from a selected one of said liquid inlets to said liquid outlet via said flow path,said front and rear body members being joined to each other at marginal joint means extending along at least a portion of confronting marginal edges of said front and rear body members,said front and rear body members being further joined together inwardly of said marginal joint means at diaphragm joint means, said diaphragm joint means extending completely about the periphery of said diaphragm means for enhancing sealing of said liquid flow path.

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