Patent US4649918A successfully refreshed from Google Patents.
US4649918A
Expired / Lapsed
US
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Bone core removing tool
Assignee: Custom Medical Devices Inc
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Filing: 1982-06-18
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Granted: 1987-03-17
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Expires: 2002-06-18
Abstract
Abstract A bone core removing tool with a stainless steel cylinder having an internal bore extending along the cylindrical axis from an externally honed cutting edge for cutting a core of bone which is pushed into the bore as the tool is driven into a bone and a plurality of radially inwardly extending teeth within the bone adjacent the edge for preventing rotation of the core to permit removal of the core by rotating the tool to break the core at the cutting edge.
Inventors
- 👤 Robert J. Pegg
- 👤 William L. Gaertner, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:35
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/32; A61B17/3205; A61B17/32053; A61B17/16; A61B17/1637; A61B2017/320064; A61F; A61F2/00; A61F2/02; A61F2/28; A61F2002/2835; A61F2002/2839; A61F2/30; A61F2/46; A61F2/4644; A61F2002/4649
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
142 words
A bone core removing tool comprising a metal cylindrical tool having an internal surface defining an internal bore extending along the cylindrical axis of said tool from an externally honed cutting edge for cutting a core of bone which is pushed into said bore as said tool is driven into a bone and having a plurality of longitudinally oriented teeth positioned about 120° apart and extending inwardly from said surface at the cutting edge into said bore filling between ten and twenty percent of the cross sectional area of said bore for preventing rotation of a core in said bore with respect to said bore to permit separation of said core from said bone by rotation of said tool, said teeth each being defined between longitudinally extending surfaces disposed in parallel planes so that each tooth is non-tapering in the radial direction.
Claim 2
Dependent Claim
142 words
A bone core removing tool comprising a metal cylindrical tool having an internal surface defining an internal bore extending along the cylindrical axis of said tool from an externally honed cutting edge for cutting a core of bone which is pushed into said bore as said tool is driven into a bone and having a plurality of longitudinally oriented teeth positioned about 120° apart and extending inwardly from said surface at the cutting edge into said bore filling between ten and twenty percent of the cross sectional area of said bore for preventing rotation of a core in said bore with respect to said bore to permit separation of said core from said bone by rotation of said tool, said teeth each being defined between longitudinally extending surfaces disposed in parallel planes so that each tooth is non-tapering in the radial direction.
Claim 3
Dependent Claim
36 words
A tool as in claim 1, wherein said tool has a hole extending therethrough transverse to said cylindrical axis for receiving an extraction handle for rotating said tool and cutting the core at the cutting edge.
Claim 4
Dependent Claim
11 words
A tool as in claim 2, further including said extraction handle.
Claim 5
Dependent Claim
12 words
A tool as in claim 1, wherein said tool is stainless steel.
Claim 6
Dependent Claim
47 words
A tool as in claim 1 wherein said tool includes a first cylindrical portion extending from said cutting edge and a second cylindrical portion extending from said first portion, said second portion having a diameter greater than said first portion and being coaxial with said first portion.
Claim 7
Dependent Claim
35 words
A tool as in claim 1, wherein the internal diameter of said bore increases from said cutting edge so that said core may be easily removed from the end opposite from that which it entered.
Claim 8
Dependent Claim
34 words
A tool as in claim 1 including a plurality of grooves around the outside periphery of said tool in a plane transverse to said axis to indicate the depth of penetration into a bone.
Claim 9
Dependent Claim
21 words
A tool as in claim 1, wherein said bore extends through said tool from said cutting edge to an opposite end.
Claim 10
Dependent Claim
23 words
A tool as in claim 1, wherein the external surface of said tool is slightly tapered in the direction from said cutting edge.
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) | 1990-03-16 | 1990-09-15 | 1991-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-16 | 1994-09-15 | 1995-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-16 | 1998-09-15 | 1999-03-17 | $7700.00 | Window Closed / Lapsed |