Ventilators for promoting lung function

Details Ventilators for promoting lung function Ventilators for promoting lung function

1989-05-17

1991-05-21

Burr, Edgar S.

Surgery

Respiratory method or device

Means for supplying respiratory gas under positive pressure

12820423, A61M 1600

Patent

active

050166263

ABSTRACT:
A lung ventilator system has a demand valve to provide for spontaneous breathing with modification of the ventilator action to complement the spontaneous breathing and to synchronize restored forced ventilation with a last spontaneous breath. The system includes means to detect gas flow in the supply to the demand valve and to output a signal to the oscillator to modify or inhibit its operation in relation to the volume of gas drawn from the demand valve to vary the duration of the exhalation phase of the ventilation cycle. The system preferably uses a pneumatic oscillator with a feedback circuit connected to be influenced by the pressure drop across a restriction in the supply to the demand valve, signalled by the operation of selected ones of a plurality of inhibitor valves responding to different pressure drop levels.

REFERENCES:
patent: 3881480 (1975-05-01), Lafourcade
patent: 4003377 (1977-01-01), Dahl
patent: 4050458 (1977-09-01), Friend
patent: 4141356 (1979-02-01), Smargiassi
patent: 4932402 (1990-06-01), Snook et al.

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