Micro-probe for gas sampling

Details Micro-probe for gas sampling Micro-probe for gas sampling

1988-05-05

1990-02-20

Sykes, Angela D.

Surgery

Truss

Pad

604 43, A61B 500

Patent

active

049017276

ABSTRACT:
A catheter probe for use in the analysis of gases absorbed in liquids, particularly suitable for the in vivo analysis of blood gases, the probe includes an equilibration chamber disposed within the active length of the probe at the distal end of the probe and which is surrounded by a gas permeable membrane. A carrier gas is introduced into the probe and enters the equilibration chamber where the gas sought to be analyzed from the blood equilibrates with the carrier gas and forms a bolus of sample gas. That bolus is then caused to flow out of the probe to an analyzer. The equilibration chamber is formed of an elongated, tortuous path that allows a high surface area to unit volume ratio, that is, the ratio of the area of the equilibration chamber that is immediately beneath the gas permeable chamber to the volume of the flow path though the equilibration chamber is high. Preferable the equilibration chamber is formed as a spiral path. The cross-sectional area of the paths through which carrier gas passes through the catheter probe are designed to be substantially the same to minimize mixing of the bolus of carrier gas containing the blood gases with the non-equilibrated carrier gas.

REFERENCES:
patent: 3572315 (1971-03-01), Cullen
patent: 3893448 (1975-07-01), Brantigan
patent: 3952730 (1976-04-01), Key
patent: 3981297 (1976-09-01), Dunn et al.
patent: 3983864 (1976-10-01), Sielaff et al.
patent: 4016863 (1977-04-01), Brantigan
patent: 4016864 (1977-04-01), Sielaff et al.
patent: 4244713 (1981-01-01), Goodwin
patent: 4274417 (1981-06-01), Delpy
patent: 4340615 (1982-07-01), Goodwin et al.
patent: 4516580 (1985-05-01), Polanyi

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