Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Patent
1984-08-13
1987-03-10
Recla, Henry J.
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
12820718, A61M 1600
Patent
active
046483950
ABSTRACT:
An oxygen concentrator for supplying enriched oxygen gas to an open breathing system of a human being or the like in synchronization with a breathing cycle of a patient is disclosed, comprising a thermocouple sensor and a control device for synchronizing the timing of opening an electromagnetic valve provided in the gas passageway with the beginning of an inhalation phase of the breathing cycle. The thermocouple sensor, located near the patient's nostrils detects the change in temperature of breathing air flow of the human being or the like and generates a detection signal indicating the instantaneous temperature of the breathing air flow. Thereafter, the control devices detects the beginning of an inhalation phase by comparing the successive two voltage levels of the detection signal. When the breathing cycle enters the inhalation phase, the control device opens the electromagnetic valve thereby permitting the flow of oxygen to the patient. Supplying oxygen only on the inhalation phase has the effect of remarkably increasing the efficiency of the oxygen concentrator moreover the detection signal is monitored to detect when the breathing cycle of the patient becomes irregular. Upon detection, the control device will supply oxygen continuously while giving an alarm signal so that emergency measures can be taken.
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Sato et al., "Patient-Triggered Insufflation", M.A. News, vol. IV, No. 11, (Nov/1983).
Moriya Kozo
Sato Toru
Recla Henry J.
Sanyo Densihkogyo Co. Ltd.
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