Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Patent
1998-08-26
2000-11-28
Dawson, Glenn K.
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
128898, 12820418, 12820421, A61M 1600
Patent
active
061521310
ABSTRACT:
An apparatus/method for detecting an empty breathing gas compartment condition in a bellows ventilator for a patient. The apparatus includes a first sensor for measuring, during inspiration, the incoming flow of gas into a driving gas compartment located in the bellows container. The second sensor measures the pressure in the driving gas compartment. During the inspiration cycle, measurements taken by the first and second sensors are signaled to a control unit and used to determine a .DELTA.V/.DELTA.p compliance value. The compliance value will be large if the bellows is movable, i.e. not in the empty breathing compartment gas condition. The compliance value is small if the empty breathing gas compartment condition exists. The compliance value, so determined, is compared with a reference compliance value in the control unit to detect the empty breathing gas compartment condition.
REFERENCES:
patent: 3729000 (1973-04-01), Bell
patent: 3831595 (1974-08-01), Valenta et al.
patent: 5662099 (1997-09-01), Tobia et al.
patent: 5694924 (1997-12-01), Cewers
Dawson Glenn K.
Instrumentarium Corp.
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