US3889680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cryoadhesion preventing cryosurgical instruments
Assignee: Armao T A
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Filing: 1974-02-07
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Granted: 1975-06-17
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Expires: 1994-02-07
Abstract
Abstract The cryosurgical instruments disclosed have a sheath of porous material spaced from a heat conducting core, and an anticryoadhesion material which is cooled to cryogenic temperatures and thus also acts as a cryogenic fluid is pumped through the space between the sheath and the core. A part of the material is exuded through the sheath to prevent sticking of the material of the sheath to the tissue with which the instrument is in contact, and the remainder of the material is recirculated. The porous sheath can be removably attached to the instrument so that a sheath in the shape of a probe or surgical blade can be used on the instrument.
Inventors
- 👤 Thomas Anthony Armao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:15
CPC Classifications
A; A61; A61B; A61B18/00; A61B18/02; A61B17/00; A61B2017/00831; A61B2017/00867; A61B2018/00964; A61B2018/0097; A61B2018/0231; A61B2018/0262; A61B2018/0268; A61B2018/0275; A61B2018/0281
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
154 words
A cryosurgical instrument comprising a body of heat insulating material, a hollow sheath comprised of a good heat conducting material at least a portion of which is porous, said sheath being on one end of said body, a core of good heat conducting material projecting into said sheath from within said body having the outer surface thereof spaced from the inner surface of said sheath so as to leave a space between said core and said sheath, said body having an inlet passage therethrough opening into said space, said body having an outlet passage therethrough opening out of said space, said body having a heat exchange space along the portion of said core within said body and means for directing a flow of heat exchange fluid therethrough for exchanging heat between said core and fluid flowing in said heat exchange space, and means for supplying a heat exchange fluid to said heat exchange space.
Claim 2
Dependent Claim
154 words
A cryosurgical instrument comprising a body of heat insulating material, a hollow sheath comprised of a good heat conducting material at least a portion of which is porous, said sheath being on one end of said body, a core of good heat conducting material projecting into said sheath from within said body having the outer surface thereof spaced from the inner surface of said sheath so as to leave a space between said core and said sheath, said body having an inlet passage therethrough opening into said space, said body having an outlet passage therethrough opening out of said space, said body having a heat exchange space along the portion of said core within said body and means for directing a flow of heat exchange fluid therethrough for exchanging heat between said core and fluid flowing in said heat exchange space, and means for supplying a heat exchange fluid to said heat exchange space.
Claim 3
Dependent Claim
38 words
A cryosurgical instrument as claimed in claim 1 in which said inlet passage has a branch connected to one end of said heat exchange space and the other end of said space being connected to said outlet passage.
Claim 4
Dependent Claim
18 words
A cryosurgical instrument as claimed in claim 1 in which said sheath is detachably mounted on said body.
Claim 5
Dependent Claim
19 words
A cryosurgical instrument as claimed in claim 1 in which said sheath is in the form of a probe.
Claim 6
Dependent Claim
33 words
A cryosurgical instrument as claimed in claim 1 in which said sheath is in the form of a blade and has a blade portion along one side thereof having a knife edge thereon.
Claim 7
Dependent Claim
16 words
A cryosurgical instrument as claimed in claim 1 in which said core is a replaceable core.
Claim 8
Dependent Claim
65 words
A cryosurgical instrument as claimed in claim 6 in which the free end of the portion of said core within said body has an annular groove therearound, and a turnbutton movably extending through said body and engageable in and disengageable from said groove for preventing removal of said core when engaged in said groove and freeing the core for removal when disengaged from said groove.
Claim 9
Dependent Claim
81 words
A cryosurgical instrument as claimed in claim 6 in which the portion of said core within said body is separate from the portion within said sheath and has a recess therein, and said portion of the core within said sheath has a spindle projecting therefrom and fitting into said recess, and thread means on said spindle and on the portion of said core within said body around the said recess engageable with each other for retaining said spindle in said recess.
Claim 10
Dependent Claim
56 words
A cryosurgical instrument as claimed in claim 1 further comprising a cleaning and purging means having a supply of cleaning fluid and a supply of purging gas, valve means for alternately coupling said supplies to the inlet passage of said body, said cleaning and purging means further being connected to the outlet passage of said body.
Claim 11
Dependent Claim
32 words
A cryosurgical instrument as claimed in claim 9 further comprising a cover removably secured over said sheath and spaced therefrom for containing the fluid forced through said sheath during cleaning and purging.
Claim 12
Dependent Claim
29 words
A cryosurgical instrument as claimed in claim 10 in which said cover has a bleed hole therein adjacent the point where said outlet passage opens out of said space.
Claim 13
Dependent Claim
35 words
A cryosurgical instrument as claimed in claim 10 in which said sheath has a base threadedly mounted on the end of said body and said cover is threadedly attached to said sheath around said base.
Claim 14
Dependent Claim
34 words
A cryosurgical instrument as claimed in claim 12 in which said body has spring loaded coupling means thereon for engaging said sheath for preventing said sheath from moving when said cover is removed therefrom.
Claim 15
Dependent Claim
14 words
A cryosurgical instrument as claimed in claim 10 in which said cover is transparent.
Claim 16
Dependent Claim
75 words
A cryosurgical instrument as claimed in claim 1 further comprising a reservoir for a fluid anti-cryoadhesion-cryogenic material, means coupled to said reservoir for circulating the fluid material from the outlet passage of said body to the inlet passage of said body through said reservoir and including a pump, a filter and a pressure regulator, and further heat exchange means in heat exchange relationship with said means for cooling said fluid material to a cryogenic temperature.
Claim 17
Dependent Claim
114 words
A cryosurgical instrument as claimed in claim 15 further comprising a cleaning and purging means having a supply of cleaning fluid and a supply of purging gas and valve means coupled thereto and coupled between said reservoir and said means for circulating the fluid material, whereby said cleaning fluid and said purging gas can be supplied to said instrument through said means for circulating said fluid material for also cleaning and purging said means for circulating the fluid material and said reservoir, and a bleed valve between said valve means and said reservoir for removing cleaning fluid and purging gas from said instrument and said reservoir and said means for circulating the fluid material.
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 |