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Portable ventilator apparatus

  • US 4,941,469 A
  • Filed: 05/23/1988
  • Issued: 07/17/1990
  • Est. Priority Date: 11/12/1987
  • Status: Expired due to Term
First Claim
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1. Ventilator apparatus comprising:

  • a pump including a negative-pressure chamber having an inlet for drawing air into the chamber, and a positive-pressure chamber having an outlet for outletting pressurized air;

    delivery means for delivering pressurized air to a patient;

    an exhalation valve assembly producing breathing cycles in which the delivery means is first connected to the patient to effect inhalation, and then is vented to the atmosphere to permit exhalation; and

    a control valve operated by said pump for controlling the breathing cycles of the exhalation valve;

    characterized in that said pump is a cyclically-operated reciprocating pump and has a low volume displacement in the order of the displacement produced by a piston-type pump having a piston diameter of less than 40 mm, operates at a cyclical speed to effect at least 2 cycles of operation for each breathing cycle of the exhalation valve, and includes an expansible member in the flow path of the air from the positive pressure chamber to the delivery means to damp oscillations produced by the reciprocating pump.

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