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Recirculating respirator

  • US 5,072,728 A
  • Filed: 09/07/1990
  • Issued: 12/17/1991
  • Est. Priority Date: 09/12/1989
  • Status: Expired due to Fees
First Claim
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1. A recirculating respirator for positive pressure operation, comprising:

  • a breathing circuit for supplying respiratory gas to a patient including an inhalation connection and an exhalation connection;

    over pressure means connected to said breathing circuit for generating an over pressure condition in said breathing circuit, said over pressure means being switchable between an over pressure condition and a normal condition;

    respiratory gas supply circuit connected to said breathing circuit including a respiratory gas supply line;

    flow rate measuring means, positioned in said respiratory gas supply line, for generating a signal representing rate flow in said respirator gas supply line; and

    , control unit means for receiving said respirator supply line flow rate signal, and connected to said over pressure means for switching said over pressure means between said over pressure condition and said normal condition, dependent on said flow rate.

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