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Method and apparatus for control of lung ventilator exhalation circuit

  • US 5,632,270 A
  • Filed: 09/12/1994
  • Issued: 05/27/1997
  • Est. Priority Date: 09/12/1994
  • Status: Expired due to Term
First Claim
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1. An apparatus for controlling gas flow through an exhalation circuit of a lung ventilator for controlling airway pressure in a patient airway connected to the exhalation circuit, comprising:

  • a pneumatically operated exhalation valve for controlling flow of gas through said exhalation circuit;

    a pump for supplying a first source of pressurized air;

    a second source of pressurized air;

    a pump control for controlling the pressure of pressurized air supplied by said pump means;

    a valve connected to said pump and said second source of pressurized air, said valve having a first position in fluid communication with said pump for receiving pressurized air from said pump, and a second position in fluid communication with said second source of pressurized air for receiving pressurized air from said second source of pressurized air, said valve having an outlet connected to a pilot pressure line in fluid communication with said exhalation valve to deliver pressurized air through said pilot pressure line to said exhalation valve for operation of said exhalation valve; and

    a valve control for switching said valve between said first and second positions.

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