US4534355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochemical sensor employing a gas-permeable hydrophilic polyurethane membrane
Assignee: Smith and Nephew PLC
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Filing: 1981-10-13
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Granted: 1985-08-13
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Expires: 2001-10-13
Abstract
Abstract A device for use in determining blood gas which employs a membrane of material permeable to blood gas to be determined characterized in that the membrane is hydrophilic polyurethane is described.
Inventors
- 👤 William D. Potter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:53
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/145; A61B5/14542; A61B5/1468; A61B5/1473; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4804; C08G18/4808; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6674; G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/40; G01N33/00; G01N33/48; G01N33/483; G01N33/487; G01N33/49; G01N33/4925
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
43 words
In an electrochemical sensor for use in determining blood gas which employs a membrane of material permeable to the blood gas to be determined, the improvement which comprises employing as the membrane a membrane which consists essentially of a hydrophilic linear polyether polyurethane.
Claim 2
Dependent Claim
43 words
In an electrochemical sensor for use in determining blood gas which employs a membrane of material permeable to the blood gas to be determined, the improvement which comprises employing as the membrane a membrane which consists essentially of a hydrophilic linear polyether polyurethane.
Claim 3
Dependent Claim
33 words
The improvement according to claim 1 wherein the electrochemical sensor includes a body contacting surface and the membrane of hydrophilic linear polyether polyurethane is coated on the body contacting surface of said sensor.
Claim 4
Dependent Claim
38 words
The improvement according to claim 1 wherein the electrochemical sensor includes a surface for contact with arterial or venous blood and the membrane of hydrophilic linear polyether polyurethane is coated on the blood contacting surface of said sensor.
Claim 5
Dependent Claim
19 words
The improvement according to claim 1 wherein the hydrophilic linear polyether polyurethane contains 10 to 40% water when hydrated.
Claim 6
Dependent Claim
19 words
The improvement according to claim 4 wherein the hydrophilic linear polyether polyurethane contains 20 to 30% water when hydrated.
Claim 7
Dependent Claim
28 words
The improvement according to claim 1 wherein the membrane is emplaced in a non-hydrated form by dip coating from a non-aqueous solution of the hydrophilic linear polyether polyurethane.
Claim 8
Dependent Claim
16 words
The improvement according to claim 1 wherein the membrane is from 10 to 25 microns thick.
Claim 9
Dependent Claim
61 words
In a catheter having an oxygen electrode including a membrane which electrode is operatively mounted at the distal end of the catheter for intravenous use and which electrode employs a membrane permeable to oxygen, the improvement which comprises employing a membrane which consists essentially of a hydrophilic linear polyether polyurethane which when hydrated contains 10 to 40% water as the membrane.
Claim 10
Dependent Claim
61 words
In a catheter having an oxygen electrode including a membrane which electrode is operatively mounted at the distal end of the catheter for intravenous use and which electrode employs a membrane permeable to oxygen, the improvement which comprises employing a membrane which consists essentially of a hydrophilic linear polyether polyurethane which when hydrated contains 10 to 40% water as the membrane.
Claim 11
Dependent Claim
60 words
The improvement according to either of claims 1 or 8 wherein the hydrophilic linear polyether polyurethane has the ether units containing poly(ethylene glycol) derivable blocks and poly (prop- or but-)ylene glycol derivable blocks in the mole ratio of 1:2 to 1:10 and ethane diol wherein the mole ratio of ethane diol to polyglycol derivable blocks is from 5:2 to 1:3.
Claim 12
Dependent Claim
38 words
In an oxygen electrode for monitoring oxygen levels which includes a protective membrane which is permeable to oxygen, the improvement which comprises employing as the protective membrane, a membrane which consists essentially of a hydrophilic linear polyether polyurethane.
Claim 13
Dependent Claim
38 words
In an oxygen electrode for monitoring oxygen levels which includes a protective membrane which is permeable to oxygen, the improvement which comprises employing as the protective membrane, a membrane which consists essentially of a hydrophilic linear polyether polyurethane.
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) | 1988-08-12 | 1989-02-11 | 1989-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-12 | 1993-02-11 | 1993-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-12 | 1997-02-11 | 1997-08-13 | $7700.00 | Window Closed / Lapsed |