Patient adaptor for medical ventilator

Details Patient adaptor for medical ventilator Patient adaptor for medical ventilator

1981-07-02

1983-11-29

Recla, Henry J.

Surgery

Respiratory method or device

Means for supplying respiratory gas under positive pressure

12820524, A61M 1600

Patent

active

044175736

ABSTRACT:
A patient adaptor fitting for a medical ventilator includes a jet pump having a nozzle receiving breathing gas from the inspiratory leg of the patient circuit, and a throat in communication with the expiratory leg of the patient circuit. Gas flows from the nozzle to the throat through a chamber in communication with the patient's breathing passages. The nozzle and the throat are dimensioned so as to produce a pressure drop in the chamber which balances the pressure drop through the expiratory leg of the patient circuit, thereby minimizing residual positive end expiratory pressure (PEEP) caused by the pneumatic resistance in the expiratory leg. The throat and nozzle dimensions are also selected so that the minimization of the residual PEEP occurs over a relatively wide range of flow rates into the nozzle.

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