Patent US4672971A successfully refreshed from Google Patents.
US4672971A
Expired / Lapsed
US
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Oxygen sensor
Assignee: SENTRON VOF A CORP OF NETHERLANDS
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Filing: 1985-06-14
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Granted: 1987-06-16
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Expires: 2005-06-14
Abstract
Abstract An oxygen sensor and method of monitoring the oxygen content of blood or other body fluids are provided, which oxygen sensor and method achieve monitoring of enhanced accuracy that is not substantially effected by the presence of an anaesthetic within the fluid being monitored. The electrolyte used in connection with this invention includes a preferential adsorption component that exhibits adsorption to the cathode of the sensor which is in preference to adsorption of the anaesthetic to the cathode of the sensor.
Inventors
- 👤 Josephus M. Otten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:00
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/145; A61B5/14542; A61B5/1468; A61B5/1473; G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/404
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
136 words
A membrane-covered bipolar oxygen sensor for measurement of the concentration of oxygen in blood or other body fluids to be monitored, comprising: an enclosure assembly containing an electrolyte and having an open end for contacting the fluid to be monitored; an oxygen-permeable membrane that seals said open end of the enclosure assembly; a cathode and an anode in contact with said electrolyte; and said electrolyte includes a preferential cathode adsorption component that absorbs to the cathode in preference to adsorption to the cathode of an anaesthetic included within the fluid to be monitored, said preferential cathode adsorption component being present in said electrolyte at a concentration that is sufficient to substantially prevent adsorption of the anaesthetic to said cathode, said preferential cathode adsorption component being an inorganic salt having an iodide ion or a lithium ion.
Claim 2
Dependent Claim
136 words
A membrane-covered bipolar oxygen sensor for measurement of the concentration of oxygen in blood or other body fluids to be monitored, comprising: an enclosure assembly containing an electrolyte and having an open end for contacting the fluid to be monitored; an oxygen-permeable membrane that seals said open end of the enclosure assembly; a cathode and an anode in contact with said electrolyte; and said electrolyte includes a preferential cathode adsorption component that absorbs to the cathode in preference to adsorption to the cathode of an anaesthetic included within the fluid to be monitored, said preferential cathode adsorption component being present in said electrolyte at a concentration that is sufficient to substantially prevent adsorption of the anaesthetic to said cathode, said preferential cathode adsorption component being an inorganic salt having an iodide ion or a lithium ion.
Claim 3
Dependent Claim
20 words
The oxygen sensor according to claim 1, wherein said preferential cathode adsorption component of the electrolyte is a metal iodide.
Claim 4
Dependent Claim
23 words
The oxygen sensor according to claim 2, wherein said metal iodide is selected from the group consisting of potassium iodide and sodium iodide.
Claim 5
Dependent Claim
14 words
The oxygen sensor according to claim 1, wherein said inorganic salt is lithium chloride.
Claim 6
Dependent Claim
39 words
The oxygen sensor according to claim 1, wherein said enclosure assembly includes a catheter having a proximal end and a distal end, and wherein said open end and said membrane are positioned at said distal end of the catheter.
Claim 7
Dependent Claim
23 words
The oxygen sensor according to claim 1, wherein said cathode is generally surrounded by said anode, and wherein said anode is generally symmetrical.
Claim 8
Dependent Claim
28 words
The oxygen sensor according to claim 1, wherein said concentration of the preferential adsorption component is on the order of about 0.01M to about 0.0001M of the electrolyte.
Claim 9
Independent Claim
122 words
A method for measuring the oxygen content of blood and other body fluids being monitored when administering an anaesthetic, comprising: providing a membrane-covered bipolar oxygen sensor having an enclosure assembly containing an electrolyte, an open end for contacting the fluid being monitored, an oxygen-permeable membrane sealing the open end, and a cathode and an anode in contact with the electrolyte; adding to said electrolyte a preferential cathode adsorption component that exhibits adsorption to the cathode in preference to adsorption of an anaesthetic to the cathode said preferential cathode adsorption component being an inorganic salt having an iodide ion or a lithium ion; and contacting the open end of the oxygen sensor with the fluid to be monitored, said fluid including an anaesthetic.
Claim 10
Independent Claim
122 words
A method for measuring the oxygen content of blood and other body fluids being monitored when administering an anaesthetic, comprising: providing a membrane-covered bipolar oxygen sensor having an enclosure assembly containing an electrolyte, an open end for contacting the fluid being monitored, an oxygen-permeable membrane sealing the open end, and a cathode and an anode in contact with the electrolyte; adding to said electrolyte a preferential cathode adsorption component that exhibits adsorption to the cathode in preference to adsorption of an anaesthetic to the cathode said preferential cathode adsorption component being an inorganic salt having an iodide ion or a lithium ion; and contacting the open end of the oxygen sensor with the fluid to be monitored, said fluid including an anaesthetic.
Claim 11
Dependent Claim
26 words
The method according to claim 8, wherein said preferential cathode adsorption component is selected from the group consisting of potassium iodide, sodium iodide and lithium chloride.
Claim 12
Dependent Claim
28 words
The method according to claim 8, further including substantially eliminating interference effects of the anaesthetic upon oxygen concentration measurement while substantially avoiding effecting of the electroreduction of oxygen.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-15 | 1990-12-15 | 1991-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-15 | 1994-12-15 | 1995-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-15 | 1998-12-15 | 1999-06-16 | $7700.00 | Window Closed / Lapsed |