US3889681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cryosurgical spraying apparatus
Assignee: Individual
•
Filing: 1974-10-30
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Granted: 1975-06-17
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Expires: 1994-10-30
Abstract
Abstract An insulated, compact, mobile cryosurgical instrument is provided that has no moving parts in contact with a liquefied gas coolant retained in an insulated container. Upon interrupting normal venting from the container, the liquefied gas coolant will build up a pressure in the container which pressure can be increased by a squeeze pressure device. The pressure will cause the liquefied gas coolant to spray from a nozzle until normal venting is restored.
Inventors
- 👤 Jack Douglas Waller
- 👤 Bobby Lee Limmer
- 👤 Felix M Sandlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:17
CPC Classifications
A; A61; A61B; A61B18/00; A61B18/02; A61B18/0218; A61B17/00; A61B2017/00743; A61B2017/00747; A61B2017/00774
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
102 words
A cryosurgical instrument for treating skin lesions comprising: an insulated container for holding a liquefied gas coolant; cap means for said insulated container; a combination vent/pressure line communicating with the inside of said insulated container; tubing means extending from near the bottom of said insulated container to the outside thereof; nozzle means attached to said tubing means for spraying said liquefied gas coolant upon pressurization from said vent/pressure line; said vent/pressure line being connected to atmosphere through a first opening and to a source of pressurized air through a second opening, said first opening being covered before pressurization through said second opening.
Claim 2
Dependent Claim
102 words
A cryosurgical instrument for treating skin lesions comprising: an insulated container for holding a liquefied gas coolant; cap means for said insulated container; a combination vent/pressure line communicating with the inside of said insulated container; tubing means extending from near the bottom of said insulated container to the outside thereof; nozzle means attached to said tubing means for spraying said liquefied gas coolant upon pressurization from said vent/pressure line; said vent/pressure line being connected to atmosphere through a first opening and to a source of pressurized air through a second opening, said first opening being covered before pressurization through said second opening.
Claim 3
Dependent Claim
21 words
The cryosurgical instrument as recited in claim 1 further comprises a manual squeeze bulb for said pressurization through said second opening.
Claim 4
Dependent Claim
41 words
The cryosurgical instrument as recited in claim 2 wherein said first opening is adapted for covering by the thumb of the operator of said squeeze bulb to stop venting before pressurization, and to instantaneously remove pressurization upon uncovering said first opening.
Claim 5
Dependent Claim
25 words
The cryosurgical instrument as recited in claim 3 wherein said vent/pressure line and said tubing means extends through said cap means in an airtight manner.
Claim 6
Dependent Claim
27 words
The cryosurgical instrument as recited in claim 4 wherein said insulated container is a vacuum bottle and said cap means is a cap for said vacuum bottle.
Claim 7
Dependent Claim
14 words
The cryosurgical instrument as recited in claim 1 wherein said nozzle means is interchangeable.
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) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |