US3776237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surgical tool and method of providing a surgical opening
Assignee: Tecna Corp
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Filing: 1972-05-11
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Granted: 1973-12-04
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Expires: 1992-05-11
Abstract
Abstract A surgical tool especially for providing a circular opening in a wall such as that of a blood vessel has an outer, circularcylindrical casing having a longitudinal axis and having a circular knife edge at one end. A plunger is axially movable within the casing by a rod extending transversely through the plunger and through longitudinal slots in the casing. A spring, abutting the end of the plunger and an end of the casing, urges the plunger toward the one end of the casing. A reduced stem at an adjacent end of the plunger carries a circular disk anvil of greater diameter than the knife edge and in the path thereof.
Inventors
- 👤 J Hill
- 👤 T Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:05
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/32; A61B17/3205; A61B17/32053; A61B17/11; A61B2017/1107
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
106 words
A surgical tool especially for use with a blood vessel comprising a casing having a longitudinal axis, means defining a coaxial knife edge at one end of said casing and having a predetermined diameter, a plunger movable axially within said casing, a stem fixed on said plunger and adapted to project axially beyond said end of said casing, and a coaxial anvil fixed on said stem and having a surface normal to said axis and exposed to said knife edge, said surface being disposed in the longitudinal path of said knife edge, said anvil being a bluntedge disc having a diameter larger than said predetermined diameter.
Claim 2
Dependent Claim
106 words
A surgical tool especially for use with a blood vessel comprising a casing having a longitudinal axis, means defining a coaxial knife edge at one end of said casing and having a predetermined diameter, a plunger movable axially within said casing, a stem fixed on said plunger and adapted to project axially beyond said end of said casing, and a coaxial anvil fixed on said stem and having a surface normal to said axis and exposed to said knife edge, said surface being disposed in the longitudinal path of said knife edge, said anvil being a bluntedge disc having a diameter larger than said predetermined diameter.
Claim 3
Dependent Claim
17 words
A device as in claim 1 including means for urging said anvil away from said knife edge.
Claim 4
Dependent Claim
34 words
A device as in claim 2 in which said urging means includes a spring within said casing and inter-posed between and abutting against one end of said plunger and an end of said casing.
Claim 5
Dependent Claim
26 words
A device as in claim 1 in which said knife edge defining means is a separate, conical piece mounted on said casing at one end thereof.
Claim 6
Dependent Claim
22 words
A device as in claim 1 including a soft coating on at least the portion of said anvil facing said knife edge.
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) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |