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Extracorporeal blood processing methods and apparatus

  • US 6,409,696 B1
  • Filed: 10/10/1997
  • Issued: 06/25/2002
  • Est. Priority Date: 06/07/1995
  • Status: Expired due to Term
First Claim
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1. A device for extracorporeal blood processing, comprising:

  • a molded cassette member having;

    an integral internal fluid passageway in direct fluid communication with both a blood removal conduit means for transferring whole blood from a donor and a blood return conduit means for transferring uncollected blood components to a donor; and

    a diaphragm member having an internal-facing side in fluid communication with said internal integral passageway and an external-facing side being externally accessible, said diaphragm member being positionally responsive to pressure changes in said blood removal conduit means and blood return conduit means; and

    a pressure-sensing means positionable relative to said cassette member for air coupling with said external-facing side of said diaphragm member of said molded cassette member and for providing an output signal responsive to said pressure changes;

    wherein one of said cassette member and said pressure-sensing means comprises an extending portion and the other one of said cassette member and pressure-sensing means comprises a receiving portion, said extending portion and receiving portion being provided for mating engagement with each other to establish said air coupling between said diaphragm and said pressure-sensing means.

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