US4865028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for carrying out a therapeutic treatment by means of a refrigerant
Assignee: Orasure Technologies Inc
•
Filing: 1988-06-03
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Granted: 1989-09-12
•
Expires: 2008-06-03
Abstract
Abstract Method and device for e.g. the removal of warts by local freezing with a liquid refrigerant applied upon the wart area by means of a hollow rod (9) of which one end (8) is connected to the pressure-reducing valve (3) of a container (1) which contains a refrigerant under the pressure of its own gas phase, such as dimethylether, whilst at the other end (10) of the hollow rod (9) a cotton wool bud (11) is present which is placed upon the wart area after having received a dosis of dimethylether thereby cooling the bud to e.g. - 50 DEG C.
Inventors
- 👤 Wilhelmus J. B. Swart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:29
CPC Classifications
A; A61; A61B; A61B18/00; A61B18/02; A61B18/0218; A61B17/00; A61B2017/00743; A61B2017/00747; A61B2017/00774; Y; Y10; Y10S; Y10S128/00; Y10S128/27
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
124 words
In device for the therapeutic treatment of a portion of the skin of a human or animal by the freezing of said portion of said skin by application of a refrigerant thereto, said device comprising a spray can containing a liquid refrigerant that boils within the temperature range of 0° C. to -50° C., and a supply tube having a supply end positioned within said spray can and a discharge end having an outlet for said refrigerant, the improvement wherein said device further comprises a cotton wool bud encompassing said discharge end of said supply tube and which cotton wool bud surrounds said outlet of said supply tube and is permeable by said liquid refrigerant and has an exposed outer surface of cotton wool.
Claim 2
Dependent Claim
124 words
In device for the therapeutic treatment of a portion of the skin of a human or animal by the freezing of said portion of said skin by application of a refrigerant thereto, said device comprising a spray can containing a liquid refrigerant that boils within the temperature range of 0° C. to -50° C., and a supply tube having a supply end positioned within said spray can and a discharge end having an outlet for said refrigerant, the improvement wherein said device further comprises a cotton wool bud encompassing said discharge end of said supply tube and which cotton wool bud surrounds said outlet of said supply tube and is permeable by said liquid refrigerant and has an exposed outer surface of cotton wool.
Claim 3
Dependent Claim
21 words
The device of claim 1 wherein said refrigerant boils at a temperature within the range of -0.5° C. and -43° C.
Claim 4
Dependent Claim
21 words
The device of claim 1 wherein said refrigerant is at a pressure of less than 5 bar within said spray can.
Claim 5
Dependent Claim
11 words
The device of claim 1 wherein said refrigerant comprises dimethyl ether.
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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) | 1992-09-11 | 1993-03-13 | 1993-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-11 | 1997-03-13 | 1997-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-11 | 2001-03-13 | 2001-09-12 | $7700.00 | Window Closed / Lapsed |