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Patient ventilator trigger circuit

  • US 3,991,790 A
  • Filed: 06/26/1975
  • Issued: 11/16/1976
  • Est. Priority Date: 09/28/1973
  • Status: Expired due to Term
First Claim
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1. A patient trigger circuit for use in a ventilator apparatus comprising first, second, and third fluidic circuits each consisting of a proportional amplifier, and fourth, fifth and sixth fluidic circuits each consisting of a flip flop circuit, each said fluidic circuit having a pair of input ports and a pair of output ports, wherein the output ports of said first through fifth fluidic circuits are connected to the input ports of the next succeeding circuit;

  • the output ports of said sixth fluidic circuit provide trigger circuit output signals;

    one of said input ports of said first fluidic circuit is connected to a source of control input signals; and

    the other input port of said first fluidic circuit is connected to a source of reference signals; and

    wherein said second fluidic circuit includes a second pair of input ports for connection respectively to a source of reference bias pressure, and to a source of sensitivity signals.

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