Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Patent
1989-03-09
1990-11-27
Burr, Edgar S.
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
12820425, 12820524, A61M 1601, A61M 1612, A62B 701, A62B 710
Patent
active
049728318
ABSTRACT:
A gas ratio controlling device for anesthetic appliances, wherein the throughput ratio of oxygen to anesthetic gas (oxygen:anesthetic gas) is controlled by means of a control circuit with a control valve operating depending on the concentration parameters required. The oxygen ratio in the supply gas must not fall below a preset value. The control is improved in order to secure that the oxygen content does not fall below the required minimum during small gas mixture flow rates and the invention provides a means of adjustment for small anesthetic gas values. According to the invention this is achieved by a control valve situated in the anesthetic gas supply line which can be bridged by a by-pass line having a throttle.
REFERENCES:
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patent: 4215409 (1980-07-01), Strowe
patent: 4266573 (1981-05-01), Braatz
patent: 4328823 (1982-05-01), Schreiber
patent: 4345612 (1982-08-01), Koni et al.
patent: 4442856 (1984-04-01), Betz
patent: 4549563 (1985-10-01), Monnier
patent: 4832014 (1989-05-01), Perkins
Schmudde Eckhard
von dem Hagen Tronje
Wallroth Carl-Friedrich
Asher Kimberly L.
Burr Edgar S.
Dragerwerk Aktiengesellschaft
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