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CLOSED CIRCUIT MEDICAL RESPIRATORS

  • US 3,695,263 A
  • Filed: 01/29/1970
  • Issued: 10/03/1972
  • Est. Priority Date: 01/30/1969
  • Status: Expired due to Term
First Claim
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1. A closed circuit medical respirator comprising a face mask for applying patient gas to a patient, an expiratory valve within said face mask and having an inlet port and an outlet port, a gas purifier having an inlet and an outlet connected on the inlet side thereof to the outlet port of said expiratory valve, a gas container connected to the outlet of said gas purifier, said container being connected to said inlet port of said expiratory valve to thereby complete a closed path, a source of patient gas to replenish losses in the system connected to said path, sensor which produces an outlet signal in response to a predetermined fluidic property connected with said path at a point between said expiratory valve and said gas purifier, a bias control means conNected to said sensor, a source of driving gas connected to said bias control, a controller connected to and operated by the output signal of said sensor, a driving means linked to said container for driving same, a source of driving gas connected to said controller so as to be passed therethrough and connected to said driving means, a pneumatic timing circuit operated by a source of driving gas connected thereto, and a pair of changeover valves connected to said timing circuit and operated thereby so as to alternately provide a source of driving gas to the driving means operating the flow of gas from said container in accordance with the required respiratory cycle, said sensor operating to vary the amount of driving gas allowed to pass through said controller as determined by the phase of the respiratory cycle.

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