US3830239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cryosurgical device
Assignee: Frigitronics Inc
•
Filing: 1972-09-12
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Granted: 1974-08-20
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Expires: 1992-09-12
Abstract
Abstract A cryosurgical instrument having a thermally insulating housing containing a cartridge partially filled with a low boiling temperature liquefied refrigerant, such as ''''Freon'''' (a mark of DuPont). The cartridge includes a heat conductive tip in contact with the refrigerant and extending from the housing. The housing carries means for selectively venting the unfilled portion of the cartridge to atmosphere. This permits the refrigerant to boil at a reduced temperature, thereby abstracting heat from, and cooling, the tip. The foregoing abstract is not to be taken either as a complete exposition or as a limitation of the present invention. In order to understand the full nature and extent of the technical disclosure of this application, reference must be had to the following detailed description and the accompanying drawings as well as to the claims.
Inventors
- 👤 J Stumpf
- 👤 J Andera
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:21
CPC Classifications
A; A61; A61B; A61B18/00; A61B18/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
100 words
A self-contained, disposable cryosurgical device which comprises: an elongated, sealed container having a first end terminating in an integral heat conductive applicator tip, and a second end; a liquefied refrigerant partially filling said container to define a vapor space therein and normally maintained at super atmospheric pressure, said liquid being in direct physical contact with said tip; an insulating housing substantially enclosing said container but exposing at least a portion of said tip; and means at said second end for selectively venting the vapor space of said container to atmosphere to boil said refrigerant and cool said container and tip.
Claim 2
Dependent Claim
100 words
A self-contained, disposable cryosurgical device which comprises: an elongated, sealed container having a first end terminating in an integral heat conductive applicator tip, and a second end; a liquefied refrigerant partially filling said container to define a vapor space therein and normally maintained at super atmospheric pressure, said liquid being in direct physical contact with said tip; an insulating housing substantially enclosing said container but exposing at least a portion of said tip; and means at said second end for selectively venting the vapor space of said container to atmosphere to boil said refrigerant and cool said container and tip.
Claim 3
Dependent Claim
18 words
The device of claim 1 wherein said venting means comprises a porous member for passage of refrigerant therethrough.
Claim 4
Dependent Claim
21 words
The device of claim 1 wherein said venting means comprises a needle actuatable to puncture the second end of said container.
Claim 5
Dependent Claim
18 words
The device of claim 3 wherein said needle is secured to an actuating plunger supported in said housing.
Claim 6
Dependent Claim
16 words
The device of claim 4 wherein said venting means comprises a porous member surrounding said needle.
Claim 7
Dependent Claim
16 words
The device of claim 1 wherein the second end of said container comprises an elastomeric diaphragm.
Claim 8
Dependent Claim
17 words
The device of claim 6 wherein said venting means comprises a needle actuatable to puncture said diaphragm.
Claim 9
Dependent Claim
18 words
The device of claim 7 wherein said needle is secured to an actuating plunger supported in said housing.
Claim 10
Dependent Claim
23 words
The device of claim 1 wherein the second end of said container comprises a valve and said venting means comprises a valve actuator.
Claim 11
Dependent Claim
16 words
The device of claim 9 wherein said valve actuator comprises a plunger supported in said housing.
Claim 12
Dependent Claim
26 words
The device of claim 10 wherein said valve comprises an elastomeric diaphragm normally sealing said second end but movable to an open position by said plunger.
Claim 13
Dependent Claim
18 words
The device of claim 11 wherein said plunger includes means for retaining said diaphragm in its open position.
References Cited (Backward Citations)
US1617066A
Cited
US1897723A
Cited
US3190081A
Cited
US3434477A
Cited
US3524446A
Cited
US3575176A
Cited
US3618610A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |