US4486290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination ion selective sensing electrode
Assignee: Medtronic Inc
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Filing: 1983-08-03
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Granted: 1984-12-04
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Expires: 2003-08-03
Abstract
Abstract A combination ion sensing and reference electrode and a method for producing it. The electrode is formed of bi-lumen plastic tubing using one lumen as sensing chamber and the other as a reference chamber. A portion of the sensing chamber extends distally relative to the reference chamber, and is permeated with an ion selective material by soaking that portion in a solution containing the ion selective material. The method of manufacture is thereby simplified and sealing of the chambers is improved.
Inventors
- 👤 Patrick T. Cahalan
- 👤 Michelle A. Schwinghammer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:15
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/4035
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
145 words
An ion sensing electrode, comprising: a plastic tube having a proximal end, a distal end, a first lumen, a second lumen, an outer wall surrounding said first and second lumens and an inner wall separating said first and second lumens, said first lumen extending to the distal end of said tube, said second lumen extending only to a first point proximal to the distal end of said tube, a portion of said tube extending from the distal end of said tube only to a second point distal to said first point impregnated with an ion selective material; electrode gel filling said first and second lumens; sealing means for sealing the distal end of said first lumen, the distal end of said second lumen open to the exterior of said tube; and first and second electrodes inserted in the first and second lumens of said tube.
Claim 2
Dependent Claim
145 words
An ion sensing electrode, comprising: a plastic tube having a proximal end, a distal end, a first lumen, a second lumen, an outer wall surrounding said first and second lumens and an inner wall separating said first and second lumens, said first lumen extending to the distal end of said tube, said second lumen extending only to a first point proximal to the distal end of said tube, a portion of said tube extending from the distal end of said tube only to a second point distal to said first point impregnated with an ion selective material; electrode gel filling said first and second lumens; sealing means for sealing the distal end of said first lumen, the distal end of said second lumen open to the exterior of said tube; and first and second electrodes inserted in the first and second lumens of said tube.
Claim 3
Dependent Claim
132 words
An ion sensing electrode, comprising: an extruded plastic tube of the type having a proximal end, a distal end, a first lumen, a second lumen, and a tube wall surrounding and defining said first and second lumens, said first lumen extending to the distal end of said tube, said second lumen extending only to a first point proximal to the distal end of said tube, said tube wall of said extruded plastic tube impregnated with an ion selective material only from the distal end of said tube to a second point distal to said first point; electrode gel filling said first and second lumens; sealing means for sealing the distal end of said first lumen; and first and second electrodes inserted in the first and second lumens of said extruded plastic tube.
Claim 4
Dependent Claim
132 words
An ion sensing electrode, comprising: an extruded plastic tube of the type having a proximal end, a distal end, a first lumen, a second lumen, and a tube wall surrounding and defining said first and second lumens, said first lumen extending to the distal end of said tube, said second lumen extending only to a first point proximal to the distal end of said tube, said tube wall of said extruded plastic tube impregnated with an ion selective material only from the distal end of said tube to a second point distal to said first point; electrode gel filling said first and second lumens; sealing means for sealing the distal end of said first lumen; and first and second electrodes inserted in the first and second lumens of said extruded plastic tube.
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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) | 1987-12-04 | 1988-06-04 | 1988-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-04 | 1992-06-04 | 1992-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-04 | 1996-06-04 | 1996-12-04 | $7700.00 | Window Closed / Lapsed |