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Patient adaptor for medical ventilator

  • US 4,417,573 A
  • Filed: 07/02/1981
  • Issued: 11/29/1983
  • Est. Priority Date: 07/02/1981
  • Status: Expired due to Term
First Claim
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1. A ventilator of the type having an inspiratory flow path, an expiratory flow path, a patient adaptor connected therebetween and supply means for providing a substantially continuous flow of respiratory gas therethrough, said patient adaptor having an inlet fluidically connected to said inspiratory flow path, an outlet fluidically connected to said expiratory flow path, and patient connection means fluidically connected to said inlet and said outlet for fluidly coupling the patient adaptor to the breathing passages of a patient, wherein the improvement comprises:

  • a gas flow accelerating nozzle in said patient adaptor within said inlet such that substantially all gas flow through said inlet passes through said nozzle;

    a chamber in said adaptor having an inlet opening and an outlet opening, said nozzle fluidly connected to said inlet opening, said chamber being in fluid communication with said patient connection means;

    a throat in said adaptor downstream of said chamber and in alignment with said nozzle coupling said chamber outlet opening to said outlet;

    said supply means providing said substantially continuous flow of gas within a range that would provide a depressed pressure in said chamber equal and opposite to a back pressure at said outlet opening caused by the pneumatic resistance of said continuous supply gas flow through said expiratory flow path; and

    whereby said nozzle and said throat are internally dimensioned and said continuous flow of said supply means is selected such that said back pressure is substantially completely offset by the depressed pressure in said chamber created by the accelerated flow of gas through said nozzle.

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