US5007424A
Expired / Lapsed
US
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Polarographic/amperometric measuring sensor
Assignee: GE Medical Systems Information Technologies GmbH
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Filing: 1990-06-29
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Granted: 1991-04-16
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Expires: 2010-06-29
Abstract
Abstract This invention provides a polarographic/amperometric measuring sensor, particularly useful for transcutaneous determination of the oxygen partial pressure (tcpO 2 ) in the blood by means of a Clark-type electrode arrangement. According to the invention the counter electrode, preferably made of a noble metal, is disposed about the insulating material encasing the working electrode and is preferably made of the same noble metal as the working electrode. The measuring sensor can also be provided with a pH electrode for simultaneous determination of the carbon dioxide partial pressure (tcpCO 2 ) in the blood.
Inventors
- 👤 Walter Ahsbahs
- 👤 Helmut Leist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:20
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/145; A61B5/14542; A61B5/14539; A61B5/1468; A61B5/1477; G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/404
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
165 words
A sensor element particularly adapted for transcutaneous, polarographic/amperometric measurement of oxygen partial pressure in the blood of a living organism, said sensor element having a body portion made of heat conducting insulating material and a measuring face at least a portion of the area of which constitutes a reference electrode surface, said measuring face having a gas permeable membrane tautly stretched thereover, a layer of electrolyte material dispersed between the said measuring face and the said gas permeable membrane, said measuring face also having disposed in the plane thereof at least one electrode assembly comprising a working electrode, a layer of insulating material completely surrounding the working electrode, said working electrode having a counter electrode completely surrounding said working electrode and disposed peripherally of the layer of insulating material to thereby separate said working electrode and said counter electrode with the said layer of insulating material and a sheath of insulation encircling said counter electrode to separate electrically said counter electrode from said reference electrode.
Claim 2
Dependent Claim
165 words
A sensor element particularly adapted for transcutaneous, polarographic/amperometric measurement of oxygen partial pressure in the blood of a living organism, said sensor element having a body portion made of heat conducting insulating material and a measuring face at least a portion of the area of which constitutes a reference electrode surface, said measuring face having a gas permeable membrane tautly stretched thereover, a layer of electrolyte material dispersed between the said measuring face and the said gas permeable membrane, said measuring face also having disposed in the plane thereof at least one electrode assembly comprising a working electrode, a layer of insulating material completely surrounding the working electrode, said working electrode having a counter electrode completely surrounding said working electrode and disposed peripherally of the layer of insulating material to thereby separate said working electrode and said counter electrode with the said layer of insulating material and a sheath of insulation encircling said counter electrode to separate electrically said counter electrode from said reference electrode.
Claim 3
Dependent Claim
20 words
The sensor element of claim 1 wherein the working electrode is the cathode and the counter electrode is the anode.
Claim 4
Dependent Claim
30 words
The sensor element of claim 2 wherein the cathode is formed integrally with the layer of insulating material by encasing a thin noble metal wire concentrically in a glass tube.
Claim 5
Dependent Claim
24 words
The sensor element of claim 3 wherein the anode comprises a thin sheet of noble metal disposed about the glass tube encasing the cathode.
Claim 6
Dependent Claim
25 words
The sensor element of claim 3 wherein the anode comprises a coating of noble metal on the surface of the glass tube encasing the cathode.
Claim 7
Dependent Claim
35 words
The sensor element of claim 1 wherein a plurality of electrode assemblies are disposed in the plane of the measuring face each electrode assembly being spaced substantially equidistantly from the center of the measuring face.
Claim 8
Dependent Claim
21 words
The sensor element of claim 6 wherein the electrode assemblies are spaced at substantially the same angular distance from each other.
Claim 9
Dependent Claim
17 words
The sensor element of claim 1 wherein the anode and cathode are each formed of noble metal.
Claim 10
Dependent Claim
19 words
The sensor element of claim 8 wherein the anode and cathode are each formed of the same noble metal.
Claim 11
Dependent Claim
20 words
The sensor element of claim 1 having a direct electrical connection between the reference electrode surface and the counter electrode.
Claim 12
Dependent Claim
16 words
The sensor element of claim 1 wherein the reference electrode surface is comprised of silver/silver chloride.
Claim 13
Dependent Claim
17 words
The sensor element of claim 1 wherein the measuring face is provided with an electrolyte storage resevoir.
Claim 14
Dependent Claim
26 words
The sensor element of claim 12 wherein the electrolyte storage resevoir comprises a plurality of recesses arranged at substantially the same angular distance from each other.
Claim 15
Dependent Claim
15 words
The sensor of claim 13 wherein the radially extending recesses are interconnected by a channel.
Claim 16
Dependent Claim
27 words
The sensor element of claim 12 wherein the reference electrode surface is comprised of silver which is chlorinated only in the region of the electrolyte storage resevoir.
Claim 17
Dependent Claim
32 words
The sensor element of claim 1 wherein a pH measuring electrode is disposed in the plane of the measuring face to enable transcutaneous measurement of carbon dioxide partial pressure in the blood.
Claim 18
Dependent Claim
16 words
The sensor element of claim 16 wherein the pH measuring electrode is comprised of iridium/iridium oxide.
Claim 19
Dependent Claim
17 words
The sensor element of claim 1 wherein the reference electrode and the counter electrode are electrically connected.
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) | 1994-04-15 | 1994-10-15 | 1995-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-15 | 1998-10-15 | 1999-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-15 | 2002-10-15 | 2003-04-16 | $7700.00 | Window Closed / Lapsed |