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Title:
METHOD AND APPARATUS FOR REAL TIME GAS ANALYSIS AND MEDICAL FLUIDS MONITORING
Document Type and Number:
WIPO Patent Application WO1999009388
Kind Code:
A3
Abstract:
A method and apparatus for real time gas analysis involving determining individual concentrations of fluid constituents in a mixture of known constituents by measuring properties of such mixture via sensor array and solving a set of equations relating the individual gas concentrations to the measured properties of the mixture, for the unknown individual gas concentrations or identities. The individual concentrations of four gases in a mixture are determined by: passing the mixture through a flowmeter (65), capillary (71), orifice (72) or sonic oscillator (76); transducing temperature (69), pressure (73, 74) and acoustic frequency measurements taken from the sensors; determining density (72), viscosity (71) and specific heat (76) of the mixture; forming three equations which respectively relate these three properties to individual gas concentrations; then solving the three equations under a condition requiring the sum of the concentrations to equal unity for the four unknown individual gas concentrations. A single oscillator can serve as both a sensor (flowmeter, acoustic velocimeter) and orifice.

Inventors:
DRZEWIECKI TADEUSZ M (US)
Application Number:
PCT/US1998/016456
Publication Date:
May 06, 1999
Filing Date:
August 18, 1998
Export Citation:
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Assignee:
METASENSORS INC (US)
DRZEWIECKI TADEUSZ M (US)
International Classes:
G01N33/497; A61M16/00; A61M16/12; G01F1/32; G01N27/00; G01N27/76; G01N29/00; G01N33/00; G06Q50/00; A61M16/08; A61M16/10; (IPC1-7): G01N31/00; A61B5/00; A61M16/00; G01N27/16; G01N29/00; G06F15/42
Foreign References:
US4150561A1979-04-24
US5465608A1995-11-14
US4558220A1985-12-10
US3791200A1974-02-12
US5640995A1997-06-24
US5495744A1996-03-05
US3927670A1975-12-23
US4150670A1979-04-24
US5469369A1995-11-21
US4779451A1988-10-25
US5325704A1994-07-05
US5821405A1998-10-13
US3698238A1972-10-17
US5221871A1993-06-22
US5076094A1991-12-31
US4847783A1989-07-11
US4907441A1990-03-13
US4670405A1987-06-02
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