Patent DE869527C successfully refreshed from Google Patents.
US4187856A
Expired / Lapsed
US
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High-speed transmission of blood stream gases
Assignee: Marquette Gas Analysis Corp
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Filing: 1978-04-03
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Granted: 1980-02-12
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Expires: 1998-04-03
Abstract
Abstract The various gases in the blood stream are analyzed by a mass spectrometer coupled to the catheter having on its distal end a membrane that passes the gases but not the blood. A "carrier" gas, such as helium, introduced under a small pressure through a small tube within the catheter lumen and into the area behind the membrane will produce a viscous flow that greatly speeds the gases to the mass spectrometer. The carrier gas is extracted prior to its arrival at the mass spectrometer.
Inventors
- 👤 Lawrence G. Hall
- 👤 Wayne J. Whistler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:40
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/145; A61B5/14542; A61B5/1468; A61B5/1473; G; G01; G01N; G01N33/00; G01N33/48; G01N33/483; G01N33/487; G01N33/49; G01N33/4925; H; H01; H01J; H01J49/00; H01J49/02; H01J49/04; H01J49/0422; H01J49/0427
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
167 words
A system for providing blood gas specimens from blood vessels to a gas analyzer comprising: a catheter having an outside diameter of approximately three millimeters comprising a distal end and a proximal end, said distal end being sufficiently sharp to enter a human blood vessel, said distal end having an opening sealed with a membrane impervious to blood, a first conduit interconnecting the proximal end of said catheter and the gas analyser, a capillary tube extending through the lumen of said catheter, a carrier gas source containing a carrier gas substantially lighter than said blood gas, one end of said capillary tube terminating at the distal end of said catheter, a second conduit connecting said carrier gas source to the other end of said capillary for admitting a carrier gas into said capillary tube extracting means connecting to said first conduit for causing said carrier gas to expand substantially more than said blood gas, said extracting means including a vacuum pump for carrying away said carrier gas.
Claim 2
Independent Claim
167 words
A system for providing blood gas specimens from blood vessels to a gas analyzer comprising: a catheter having an outside diameter of approximately three millimeters comprising a distal end and a proximal end, said distal end being sufficiently sharp to enter a human blood vessel, said distal end having an opening sealed with a membrane impervious to blood, a first conduit interconnecting the proximal end of said catheter and the gas analyser, a capillary tube extending through the lumen of said catheter, a carrier gas source containing a carrier gas substantially lighter than said blood gas, one end of said capillary tube terminating at the distal end of said catheter, a second conduit connecting said carrier gas source to the other end of said capillary for admitting a carrier gas into said capillary tube extracting means connecting to said first conduit for causing said carrier gas to expand substantially more than said blood gas, said extracting means including a vacuum pump for carrying away said carrier gas.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-02-11 | 1983-08-13 | 1984-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-11 | 1987-08-13 | 1988-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-11 | 1991-08-13 | 1992-02-12 | $7700.00 | Window Closed / Lapsed |