Expiration valve control arrangement for a ventilating apparatus

Details Expiration valve control arrangement for a ventilating apparatus Expiration valve control arrangement for a ventilating apparatus

1989-06-30

1991-11-19

Burr, Edgar S.

Surgery

Respiratory method or device

Means for supplying respiratory gas under positive pressure

12820426, 12820418, A62B 902, A61M 1600

Patent

active

050657461

ABSTRACT:
The invention is directed to an expiration valve control arrangement for a ventilating apparatus. The control arrangement includes a control valve for generating a control pressure in the control chamber of an expiration valve. The control valve includes a connecting passage supplied from a control gas source via a control gas line. The connecting passage opens into an outflow chamber of the control valve and the outflow chamber has an outlet to the ambient. The control valve is configured so that the dynamic end expiratory overpressure can be compensated. For this purpose, the connection passage of the control valve includes a throttle generating an underpressure and a pressure line extends from this throttle and opens into the control chamber of the expiration valve. A closure force is applied to a closure element at the outlet of the connection passage. The closure element coacts with the throttle with the underpressure being adjusted by adjusting the closure force on the closure element. The valve chamber of the expiration valve is connected to a device generating an underpressure.

REFERENCES:
patent: 3385295 (1968-05-01), Beasley
patent: 3486502 (1969-12-01), Wilson
patent: 3905362 (1975-09-01), Eyrick et al.
patent: 4190045 (1980-02-01), Bartels
patent: 4227523 (1980-10-01), Warnow et al.
patent: 4454893 (1984-06-01), Orchard
patent: 4813409 (1989-03-01), Ismach

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