Respiration system with patient assist capability

Details Respiration system with patient assist capability Respiration system with patient assist capability

1976-01-26

1977-09-27

Michell, Robert W.

Surgery

Truss

Pad

340240, A61M 1600

Patent

active

040504581

ABSTRACT:
A method and apparatus for initiating a positive-pressure-assisted inspiration phase in response to a patient's inspiratory effort, and independently of the absolute pressure at the time of the inspiratory effort, since the absolute pressure may vary from patient to patient or depend upon a particular mode of operation of the respiration system. The invention apparatus includes a differentiator circuit for obtaining a time-differentiated pressure signal, and a circuit for detecting a change in the sign of the slope of the differentiated signal. The patient's inspiratory effort is manifested as an increased rate of pressure drop, and this shows up as a change in the sign of the slope of the differentiated pressure, which is detected independently of absolute pressure, and is utilized to initiate an assisted inspiration phase. The apparatus also includes circuitry for detecting a predetermined drop in pressure, from the time of detection of the inspiratory effort, to ensure that minor variations in the pressure signal will not trigger a spurious inspiration phase.

REFERENCES:
patent: 3748656 (1973-07-01), Gray et al.
patent: 3834382 (1974-09-01), Lederman et al.

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