Title:
MEDICAL GAS RECIRCULATION SYSTEM
Document Type and Number:
WIPO Patent Application WO2003092776
Kind Code:
A3
Abstract:
A medical device (103) is supplied (105) with a gas mixture from a higher pressure section of a main circuit (102) in which medical gas recirculates through the higher pressure section and a lower pressure section. Decontaminated spent gas is returned to the lower pressure section of the main circuit. Pressure in the higher pressure section is maintained by a pressure maintaining valve (141) and gas flow in the main circuit is maintained by a volume regulator (145) in the lower pressure section. The composition of the recirculating gas mixture is maintained by addition of respective feed gases in response to concentration and/or volume variation measurement. The method has particular application to the feed of a binary oxygen/xenon mixture to a cardiopulmonary bypass oxygenator or an artificial ventilator.
Inventors:
DOWNIE NEIL ALEXANDER (GB)
KERR STUART ALEXANDER (GB)
KERR STUART ALEXANDER (GB)
Application Number:
PCT/GB2003/001875
Publication Date:
March 18, 2004
Filing Date:
May 01, 2003
Export Citation:
Assignee:
AIR PROD & CHEM (US)
DOWNIE NEIL ALEXANDER (GB)
KERR STUART ALEXANDER (GB)
DOWNIE NEIL ALEXANDER (GB)
KERR STUART ALEXANDER (GB)
International Classes:
A61M1/16; A61M16/00; A61M16/12; A61M1/36; A61M16/10; A61M16/22; (IPC1-7): A61M16/00; A61M16/10; A61M16/12
Foreign References:
| US6131571A | 2000-10-17 | |||
| EP0861672A1 | 1998-09-02 | |||
| EP0745405A1 | 1996-12-04 | |||
| SU1188638A1 | 1985-10-30 | |||
| US4903693A | 1990-02-27 |
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