US4488557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Topical agent for transcutaneous measurement of partial pressure of oxygen
Assignee: Individual
•
Filing: 1984-03-02
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Granted: 1984-12-18
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Expires: 2004-03-02
Abstract
Abstract The invention relates to a method for treating skin for assisting transcutaneous measurement of arterial partial pressure of oxygen. The method involves applying topically 2-thenoyltrifluoroacetone to the area of skin over which the partial pressure of oxygen is to be measured.
Inventors
- 👤 Rolf R. Engel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:16
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/145; A61B5/14542; A61B5/1468; A61B5/1477; A61B5/68; A61B5/6801; A61B5/683; A61B5/6832; A61B5/6833; A61K; A61K31/00; A61K31/33; A61K31/38
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
89 words
A method for transcutaneous measurement of arterial partial pressure of oxygen comprising: applying topically 2-thenoyltrifluoroacetone to an area of skin over which the partial pressure of oxygen is to be measured; placing a sensor unit over the area of skin to which the 2-thenoyltrifluoroacetone has been applied and sealing the area of skin from the ambient atmosphere; raising the temperature of the area of skin by heat emanating from the sensor unit; and measuring with the sensor unit the transcutaneous partial pressure of oxygen over the area of skin.
Claim 2
Independent Claim
89 words
A method for transcutaneous measurement of arterial partial pressure of oxygen comprising: applying topically 2-thenoyltrifluoroacetone to an area of skin over which the partial pressure of oxygen is to be measured; placing a sensor unit over the area of skin to which the 2-thenoyltrifluoroacetone has been applied and sealing the area of skin from the ambient atmosphere; raising the temperature of the area of skin by heat emanating from the sensor unit; and measuring with the sensor unit the transcutaneous partial pressure of oxygen over the area of skin.
Claim 3
Dependent Claim
32 words
The method of claim 1 wherein the 2-thenoyltrifluoroacetone is in crystalline form and is applied directly to the area of skin over which the partial pressure of oxygen is to be measured.
Claim 4
Dependent Claim
17 words
The method of claim 2 wherein the amount of 2-thenoyltrifluoroacetone crystals is about 5 mg or less.
Claim 5
Dependent Claim
18 words
The method of claim 1 wherein the 2-thenoyltrifluoroacetone is embodied in a gelatinous or solid matrix delivery medium.
Claim 6
Dependent Claim
20 words
The method of claim 1 wherein the 2-thenoyltrifluoroacetone is dissolved or suspended in a liquid medium prior to topical application.
Claim 7
Dependent Claim
26 words
The method of claim 5 wherein the amount of 2-thenoyltrifluoroacetone in the liquid medium is in the range of about 2% to about 3% by weight.
Claim 8
Dependent Claim
19 words
The method of claim 6 wherein the amount of 2-thenoyltrifluoroacetone in the liquid medium is about 2% by weight.
Claim 9
Dependent Claim
31 words
The method of claim 5 wherein the liquid medium further comprises contact gel for use between the area of skin and a membrane, the membrane separating sensor electrodes from the skin.
Claim 10
Dependent Claim
13 words
The method of claim 8 wherein the contact gel comprises water and glycerol.
Claim 11
Dependent Claim
13 words
The method of claim 9 wherein the liquid medium further comprises propylene glycol.
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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) | 1987-12-18 | 1988-06-18 | 1988-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-18 | 1992-06-18 | 1992-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-18 | 1996-06-18 | 1996-12-18 | $7700.00 | Window Closed / Lapsed |