Electronically controlled respirator

Details Electronically controlled respirator Electronically controlled respirator

1981-06-22

1983-07-19

Apley, Richard J.

Surgery

Respiratory method or device

Means for supplying respiratory gas under positive pressure

12820421, 12820423, A61M 1600

Patent

active

043938698

ABSTRACT:
The breathing cycle of a patient is controlled to achieve proper ventilation and at the same time minimize the work of distension of the lungs. Oxygen enriched air is delivered to the patient during the inspiration period such that the pressure waveform is a ramp function having initial and final values which are dependent on the resistance, compliance and alveolar volume of the lungs. The apparatus includes a source of oxygen enriched air at a regulated pressure and a pneumatically controlled pressure reducing valve for reducing the pressure of the oxygen enriched air for delivery to the patient. The valve is controlled by a transducer which converts an electrical control signal into a pneumatic control signal. The electrical control signal which is generated by an electronic control circuit, is a function of the parameters of the patient's lungs.

REFERENCES:
patent: 3961627 (1976-06-01), Earnst et al.
Jain et al., A Control System for Long Term Ventilation of the Lungs.

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