US4466879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polarographic oxygen sensor
Assignee: Ethicon Inc
•
Filing: 1983-04-08
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Granted: 1984-08-21
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Expires: 2003-04-08
Abstract
Abstract A polarographic sensor for blood oxygen monitoring is defined by respective anode and cathode electrode wires fixedly maintained in conventional fashion. The end cross sections of the wires are carried on a surface, and overlying this surface is a capillary pore ultrafiltration membrane. The microscopic capillary pores, which have diameters less than 12 micrometers each, pass water therethrough and thus allow the blood, which passes on the side of the membrane opposite the anode and cathode, to act as its own electrolyte.
Inventors
- 👤 Nelson Ho
- 👤 Bryan Thompson
- 👤 Jiri Kratochvil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:04
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/404; G01N27/416; G01N27/48
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
68 words
A polarographic sensor for monitoring or measuring partial pressure of blood oxygen comprising: respective anode and cathode electrode elements carried fixedly on a given surface; an ultrafiltration membrane directly overlying and contacting said surface and said electrode elements, said membrane defining substantially cylindrical pores having diameters of less than 12 micrometers; and means for passing blood over the side of said membrane not in contact with said surface.
Claim 2
Dependent Claim
68 words
A polarographic sensor for monitoring or measuring partial pressure of blood oxygen comprising: respective anode and cathode electrode elements carried fixedly on a given surface; an ultrafiltration membrane directly overlying and contacting said surface and said electrode elements, said membrane defining substantially cylindrical pores having diameters of less than 12 micrometers; and means for passing blood over the side of said membrane not in contact with said surface.
Claim 3
Dependent Claim
32 words
An electrode as defined in claim 1 wherein said pores have diameters in the range 0.01 to 0.05 micrometers, and a density distribution in the range of 20-30 million per square centimeter.
Claim 4
Dependent Claim
34 words
An electrode as defined in claim 1 wherein said membrane consists of a film of material having a thickness between 5 and 20 micrometers and selected from the group consisting of polycarbonate and polyester.
Claim 5
Dependent Claim
29 words
An electrode as described in claim 1 wherein said membrane acts to pass and hence filter hydrous elements of the blood, which functions as an electrolyte for said electrode.
Claim 6
Dependent Claim
32 words
A sensor as described in claim 1 wherein said membrane is composed of material which hydrates in less than 10 minutes time, and which is physically, mechanically, and thermally stable when wet.
Claim 7
Dependent Claim
21 words
A sensor as described in claim 1 wherein said membrane defines up to 6×10 9 of said pores per square centimeter.
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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) | 1987-08-21 | 1988-02-20 | 1988-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-21 | 1992-02-20 | 1992-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-21 | 1996-02-20 | 1996-08-21 | $7700.00 | Window Closed / Lapsed |