Patent US5098428A successfully refreshed from Google Patents.
US5098428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cryosurgical spraying apparatus
Assignee: Premier Dental Products Co
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Filing: 1991-03-14
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Granted: 1992-03-24
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Expires: 2011-03-14
Abstract
Abstract An insulated, compact, mobile crysosurgical 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 may be increased by a squeeze pressure device. That pressure will cause the liquefied gas coolant to spray from a nozzle until normal venting is restored.
Inventors
- 👤 Felix M. Sandlin
- 👤 Jack D. Waller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:19
CPC Classifications
A; A61; A61B; A61B18/00; A61B18/02; A61B18/0218
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
148 words
A cryosurgical instrument for treating skin lesions comprising; an insulated container for holding a liquefied gas coolant; cap means for said insulated container, said cap means having a first passage extending vertically through said cap means and a second passage extending horizontally through said cap means; tubing means extending from near the bottom of said insulated container through said first passage and to the outside thereof; a pressure line connected to a first opening of said second passage and communicating with the inside of said insulated container; a vent means formed by a second opening of said second passage and communicating with the inside of said insulated container; nozzle means attached to said tubing means for spraying said liquefied gas coolant upon pressurization from said pressure line; and said pressure line being connected to a source of pressurized air, wherein said vent means must be covered before pressurization.
Claim 2
Dependent Claim
148 words
A cryosurgical instrument for treating skin lesions comprising; an insulated container for holding a liquefied gas coolant; cap means for said insulated container, said cap means having a first passage extending vertically through said cap means and a second passage extending horizontally through said cap means; tubing means extending from near the bottom of said insulated container through said first passage and to the outside thereof; a pressure line connected to a first opening of said second passage and communicating with the inside of said insulated container; a vent means formed by a second opening of said second passage and communicating with the inside of said insulated container; nozzle means attached to said tubing means for spraying said liquefied gas coolant upon pressurization from said pressure line; and said pressure line being connected to a source of pressurized air, wherein said vent means must be covered before pressurization.
Claim 3
Dependent Claim
19 words
The cryosurgical instrument as recited in claim 1 wherein said source of pressurized air comprises a manual squeeze bulb.
Claim 4
Dependent Claim
49 words
The cryosurgical instrument as recited in claim 2 wherein said instrument is adapted to be held with one hand by an operator so that a finger of that hand may be used to cover said vent means before pressurization and to instantaneously remove pressurization upon uncovering said vent means.
Claim 5
Dependent Claim
29 words
The cryosurgical instrument as recited in claim 3 wherein said pressure line, said vent means, and said tubing means extend through said cap means in an air tight 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)
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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) | 1995-03-24 | 1995-09-23 | 1996-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-24 | 1999-09-23 | 2000-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-24 | 2003-09-23 | 2004-03-24 | $7700.00 | Window Closed / Lapsed |