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Respirator

  • US 4,036,221 A
  • Filed: 04/02/1975
  • Issued: 07/19/1977
  • Est. Priority Date: 05/01/1972
  • Status: Expired due to Term
First Claim
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1. A volume-cycled respirator system for delivering a controlled volume of gas to a patient, the system comprising:

  • a. displaceable gas delivery means having a position which is adjustable for forcing periodically a volume of gas under pressure into the lungs of a patient throughout an inspiratory period of a respiratory cycle;

    b. drive means operatively connected to the gas delivery means to displace the volume of gas to be delivered;

    c. means for generating a reference signal representing variations in the position of the gas delivery means with respect to time throughout the inspiratory period necessary to deliver a desired volume of gas in accordance with a desired volume-versus-time waveform; and

    d. closed loop feedback means for controlling the instantaneous position of the gas delivery means throughout the inspiratory period, the closed loop feedback means including

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