Patent US2582662A successfully refreshed from Google Patents.
Patent US3933156A successfully refreshed from Google Patents.
US3933156A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooling apparatus particularly for medical-surgical use
Assignee: Individual
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Filing: 1975-01-08
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Granted: 1976-01-20
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Expires: 1995-01-08
Abstract
Abstract Refrigerating apparatus for medical use including a probe comprising two concentric tubes through the inner tube of which, in use of the apparatus, a refrigerant is forced so as to expand into the outer tube as it leaves the inner tube thereby refrigerating the tip of the probe by flash evaporation and expansion, then flowing back along the space between the tubes, in which there are provided two further tubes surrounding the probe except for the refrigerating tip and defining passageways between themselves and the outer tube through which the refrigerant is fed before being introduced into the innermost tube, to provide thermal insulation for the sides of the probe apart from the refrigerating tip.
Inventors
- 👤 Giovanni Riggi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:57
CPC Classifications
A; A61; A61B; A61B18/00; A61B18/02; A61B2018/0231; A61B2018/0262; A61B2018/0268
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
348 words
In a refrigerating apparatus suitable for medical use, of the type comprising: a body, a tubular probe projecting from said body, said probe comprising, a first tube formed as a capillary tube, and connected by one end to a first conduit within said body, a second tube surrounding said first tube and connected by one end to a second conduit within said body, the other end of said second tube being closed and forming a chamber around the other end of said first tube and an annular passageway between itself and said first tube, a source of refrigerant fluid under pressure, means defining a flow path for said refrigerant fluid from said source of refrigerant fluid to said first conduit, and a control valve in said second conduit operable to connect said second conduit to the atmosphere whereby to permit refrigerant fluid to flow from said source means along said first tube from which it expands into said chamber at said other end of said second tube to effect refrigeration of the walls of said chamber by flash evaporation and expansion, and to flow from said chamber along said annular passageway through said control valve to the atmosphere, the improvement wherein, said second tube is surrounded by a third tube which is coaxial therewith and spaced therefrom to define a second annular passageway between said second and third tubes, said third tube is surrounded by a fourth tube which is coaxial therewith and spaced therefrom to define a third annular passageway, said second and third annular passageways communicating with one another but not with said expansion chamber at said other end of said probe and said second and third tubes being of such a length that they surround all but a part of said expansion chamber, which is left exposed, and means interconnecting said second and third annular passageways in series in the flow path of said refrigerant between said source and said first tube whereby said refrigerant acts as a thermal insulation for said first and second tubes which are in thermal contact with said expansion chamber.
Claim 2
Dependent Claim
348 words
In a refrigerating apparatus suitable for medical use, of the type comprising: a body, a tubular probe projecting from said body, said probe comprising, a first tube formed as a capillary tube, and connected by one end to a first conduit within said body, a second tube surrounding said first tube and connected by one end to a second conduit within said body, the other end of said second tube being closed and forming a chamber around the other end of said first tube and an annular passageway between itself and said first tube, a source of refrigerant fluid under pressure, means defining a flow path for said refrigerant fluid from said source of refrigerant fluid to said first conduit, and a control valve in said second conduit operable to connect said second conduit to the atmosphere whereby to permit refrigerant fluid to flow from said source means along said first tube from which it expands into said chamber at said other end of said second tube to effect refrigeration of the walls of said chamber by flash evaporation and expansion, and to flow from said chamber along said annular passageway through said control valve to the atmosphere, the improvement wherein, said second tube is surrounded by a third tube which is coaxial therewith and spaced therefrom to define a second annular passageway between said second and third tubes, said third tube is surrounded by a fourth tube which is coaxial therewith and spaced therefrom to define a third annular passageway, said second and third annular passageways communicating with one another but not with said expansion chamber at said other end of said probe and said second and third tubes being of such a length that they surround all but a part of said expansion chamber, which is left exposed, and means interconnecting said second and third annular passageways in series in the flow path of said refrigerant between said source and said first tube whereby said refrigerant acts as a thermal insulation for said first and second tubes which are in thermal contact with said expansion chamber.
Claim 3
Dependent Claim
64 words
The refrigeration apparatus of claim 1, wherein said source of refrigerant under pressure is a container attachable to said body to serve as a handgrip for said apparatus, and wherein said means defining a flow path from said source of refrigerant to said first tube includes a condenser coil carried by said body and a plurality of conduits formed as drillings in said body.
Claim 4
Dependent Claim
159 words
A tubular probe for refrigeration apparatus such as refrigeration apparatus for medical use, comprising: a first tube formed as a capillary tube through which, in use of the probe, a refrigerant fluid is passed from one end to the other, a second tube coaxially surrounding said first tube and closed adjacent said other end of said first tube to define an expansion chamber around said other end of said first tube and a first annular passageway between said first tube and said second tube, a third tube coaxially surrounding said second tube and defining therewith a second annular passageway, a fourth tube coaxially surrounding said third tube and defining therewith a third annular passageway, said second and third annular passageways communicating with one another adjacent said exapansion chamber but not communicating therewith, and said third and fourth tubes being of such a length that they partly surround said expansion chamber so as to leave a part only thereof exposed.
Claim 5
Dependent Claim
159 words
A tubular probe for refrigeration apparatus such as refrigeration apparatus for medical use, comprising: a first tube formed as a capillary tube through which, in use of the probe, a refrigerant fluid is passed from one end to the other, a second tube coaxially surrounding said first tube and closed adjacent said other end of said first tube to define an expansion chamber around said other end of said first tube and a first annular passageway between said first tube and said second tube, a third tube coaxially surrounding said second tube and defining therewith a second annular passageway, a fourth tube coaxially surrounding said third tube and defining therewith a third annular passageway, said second and third annular passageways communicating with one another adjacent said exapansion chamber but not communicating therewith, and said third and fourth tubes being of such a length that they partly surround said expansion chamber so as to leave a part only thereof exposed.
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) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |