US3924628A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cyrogenic bladder for necrosing tissue cells
Assignee: Individual
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Filing: 1972-12-01
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Granted: 1975-12-09
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Expires: 1992-12-01
Abstract
Abstract A method of, and apparatus for necrosing human tissue cells are described in which an expandable bladder filled with a fluid at a cyrogenic temperature is used to subject the entire area of tissue in contact with the bladder to temperatures sufficiently low to cause coagulation necrosis, whereby the entire contacted area of tissue is simultaneously necrosed. As an example, this apparatus can be utilized to cause sterilization by necrosis of the entire functional endometrial layer of the uterus of a human female.
Inventors
- 👤 William Droegemueller
- 👤 Jr Ralph N Eberhardt
- 👤 Paul E Bingham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:40
CPC Classifications
A; A61; A61F; A61F7/00; A61F7/12; A61F7/123; A61B; A61B17/00; A61B17/42; A61B18/00; A61B18/02; A61B2017/4216; A61B2018/00053; A61B2018/00214; A61B2018/0022; A61B90/00; A61B90/03; A61B2090/033; A61B2090/036
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
102 words
A method of effecting coagulation necrosis of the functional uterine endometrium comprising the steps of: a. inserting a flexible bladder in the uterus; b. inflating said bladder with a fluid at cryogenic temperature so that said bladder is in substantially continuous contact with the inner surface of the functional uterine lining, said fluid undergoing a phase change to extract heat from said functional uterine endometrium; and c. maintaining said bladder so inflated with said fluid at said cryogenic temperature for a period of time sufficient for said heat extraction to effect simultaneous coagulation necrosis of substantially all of the functional uterine endometrium.
Claim 2
Independent Claim
102 words
A method of effecting coagulation necrosis of the functional uterine endometrium comprising the steps of: a. inserting a flexible bladder in the uterus; b. inflating said bladder with a fluid at cryogenic temperature so that said bladder is in substantially continuous contact with the inner surface of the functional uterine lining, said fluid undergoing a phase change to extract heat from said functional uterine endometrium; and c. maintaining said bladder so inflated with said fluid at said cryogenic temperature for a period of time sufficient for said heat extraction to effect simultaneous coagulation necrosis of substantially all of the functional uterine endometrium.
Claim 3
Dependent Claim
28 words
A method as defined in claim 1 wherein the exterior of said bladder in contact with said lining is maintained at least -73*C for at least 2 minutes.
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) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |