US3702114A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid refrigerant spray device
Assignee: Frigitronics Inc
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Filing: 1970-08-26
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Granted: 1972-11-07
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Expires: 1990-08-26
Abstract
Abstract There is disclosed medical apparatus for spraying a low boiling point liquid refrigerant directly onto a site to be treated. It comprises a container which is vented but has a valve for selectively closing the vent, normal boiling of the liquid thereby resulting in self pressurization. A discharge orifice at the bottom of the container leads through an evaporating coil to an applicator, to which may be connected interchangeable needles. The evaporating coil permits partial vaporization of the refrigerant so that the spray is a liquid-gas mixture with little propensity to drip or run from the point of contact.
Inventors
- 👤 Setrag A Zacarian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:23
CPC Classifications
A; A61; A61B; A61B18/00; A61B18/02; A61B18/0218; A61B17/00; A61B2017/00017; A61B2017/00022; A61B2017/00084; A61B2017/00092
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
116 words
Medical apparatus for spraying liQuid refrigerant which comprises: a thermally insulated container for a refrigerant adapted to be held by one hand of a user, said container having a top and a bottom and defining at its bottom a discharge orifice; a partially coiled heat exchange conduit attached to said discharge orifice; an applicator means fixed to and in flow communication with said heat exchange conduit; a removable cap closing the top of said container and defining a vent to atmosphere; normally-open valve means controlling the flow of gas through said vent; and valve actuation means attached to said cap whereby the user can direct and control the flow of refrigerant spray from said applicator means.
Claim 2
Dependent Claim
116 words
Medical apparatus for spraying liQuid refrigerant which comprises: a thermally insulated container for a refrigerant adapted to be held by one hand of a user, said container having a top and a bottom and defining at its bottom a discharge orifice; a partially coiled heat exchange conduit attached to said discharge orifice; an applicator means fixed to and in flow communication with said heat exchange conduit; a removable cap closing the top of said container and defining a vent to atmosphere; normally-open valve means controlling the flow of gas through said vent; and valve actuation means attached to said cap whereby the user can direct and control the flow of refrigerant spray from said applicator means.
Claim 3
Dependent Claim
10 words
The apparatus of claim 1 wherein said container is plastic.
Claim 4
Dependent Claim
28 words
The apparatus of claim 1 wherein said valve means comprises a spring loaded valve and said valve actuation means comprises manually operated trigger means for closing said valve.
Claim 5
Dependent Claim
20 words
The apparatus of claim 1 wherein said heat exchange conduit comprises a metallic evaporating coil substantially exposed to ambient temperature.
Claim 6
Dependent Claim
13 words
The apparatus of claim 1 wherein said cap includes a safety exhaust valve.
Claim 7
Dependent Claim
19 words
The apparatus of claim 1 wherein said applicator means comprises: a luer connector and a hollow needle connectable thereto.
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) | 1975-11-07 | 1976-05-08 | 1976-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-07 | 1980-05-08 | 1980-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-07 | 1984-05-08 | 1984-11-07 | $7700.00 | Window Closed / Lapsed |