US3886945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cryosurgical apparatus
Assignee: Frigitronics Inc
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Filing: 1973-11-07
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Granted: 1975-06-03
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Expires: 1993-11-07
Abstract
Abstract There is disclosed a cryosurgical apparatus of the type which operates from a source of compressed gas. It includes a handle portion with removable and interchangeable probes. A defrost valve in the exhaust conduit permits easy and quiet operation by the surgeon. It is constructed in such a manner that the exhaust valve cannot be closed unless the probe is fully seated in the handle. It also includes an improved nozzle which is substantially less critical than prior art nozzles and permits simplified and less expensive construction. 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
- 👤 Joseph G Stumpf
- 👤 Joseph F Andera
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:36
CPC Classifications
F; F25; F25B; F25B9/00; F25B9/02; A; A61; A61B; A61B18/00; A61B18/02; A61F; A61F7/00; A61F7/12; F25B2309/00; F25B2309/02; F25B2309/021; F25B2309/022
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
142 words
A gas operated cryosurgical instrument which comprises: a handle defining a socket therein; a movable first valve member in said handle; a tubular exhaust conduit terminating at one end in a hollow tip of high thermal conductivity, the other end defining a second valve member and including means detachably securing said exhaust conduit seated within said socket; a gas delivery conduit mounted in said handle and extending through said socket and through said exhaust conduit when so secured and terminating at a nozzle within said tip; means for selectively advancing said first valve member against said second valve member to close said exhaust conduit when said exhaust conduit is fully seated within said socket; and means for limiting the movement of said first valve member to prevent closure of said exhaust conduit when the conduit is not fully seated within said socket.
Claim 2
Dependent Claim
142 words
A gas operated cryosurgical instrument which comprises: a handle defining a socket therein; a movable first valve member in said handle; a tubular exhaust conduit terminating at one end in a hollow tip of high thermal conductivity, the other end defining a second valve member and including means detachably securing said exhaust conduit seated within said socket; a gas delivery conduit mounted in said handle and extending through said socket and through said exhaust conduit when so secured and terminating at a nozzle within said tip; means for selectively advancing said first valve member against said second valve member to close said exhaust conduit when said exhaust conduit is fully seated within said socket; and means for limiting the movement of said first valve member to prevent closure of said exhaust conduit when the conduit is not fully seated within said socket.
Claim 3
Dependent Claim
142 words
A gas operated cryosurgical instrument which comprises: a handle defining a socket therein; a movable first valve member in said handle; a tubular exhaust conduit terminating at one end in a hollow tip of high thermal conductivity, the other end defining a second valve member and including means detachably securing said exhaust conduit seated within said socket; a gas delivery conduit mounted in said handle and extending through said socket and through said exhaust conduit when so secured and terminating at a nozzle within said tip; means for selectively advancing said first valve member against said second valve member to close said exhaust conduit when said exhaust conduit is fully seated within said socket; and means for limiting the movement of said first valve member to prevent closure of said exhaust conduit when the conduit is not fully seated within said socket.
Claim 4
Dependent Claim
142 words
A gas operated cryosurgical instrument which comprises: a handle defining a socket therein; a movable first valve member in said handle; a tubular exhaust conduit terminating at one end in a hollow tip of high thermal conductivity, the other end defining a second valve member and including means detachably securing said exhaust conduit seated within said socket; a gas delivery conduit mounted in said handle and extending through said socket and through said exhaust conduit when so secured and terminating at a nozzle within said tip; means for selectively advancing said first valve member against said second valve member to close said exhaust conduit when said exhaust conduit is fully seated within said socket; and means for limiting the movement of said first valve member to prevent closure of said exhaust conduit when the conduit is not fully seated within said socket.
Claim 5
Dependent Claim
17 words
The instrument of claim 1 wherein said first valve member is carried by said gas delivery conduit.
Claim 6
Dependent Claim
25 words
The instrument of claim 2 wherein said advancing means comprises a manually operable trigger connected to advance both of said delivery conduit and valve member.
Claim 7
Dependent Claim
13 words
The instrument of claim 1 wherein said first valve member comprises a ball.
Claim 8
Dependent Claim
28 words
The instrument of claim 1 wherein said nozzle includes a cylindrical gas discharge passage of smaller diameter than said delivery conduit and a smoothly curved reduction passage therebetween.
Claim 9
Dependent Claim
62 words
The instrument of claim 1 wherein said advancing means comprises: pivot means within said handle; a rod supported by said pivot means having a first end engaging said first valve member on one side of said pivot means and a second end on the other side of said means; and a manually operable trigger secured to the second end of said rod.
Claim 10
Dependent Claim
18 words
The instrument of claim 6 wherein said pivot means comprises a trunnion ball rotatably supported within said handle.
Claim 11
Dependent Claim
17 words
The instrument of claim 7 wherein said first valve member is carried by said gas delivery conduit.
Claim 12
Dependent Claim
13 words
The instrument of claim 8 wherein said first valve member comprises a ball.
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) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |