Patent US5234430A successfully refreshed from Google Patents.
US5234430A
Expired / Lapsed
US
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Orthopedic fixation screw and method
Assignee: Smith and Nephew Inc
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Filing: 1991-12-18
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Granted: 1993-08-10
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Expires: 2011-12-18
Abstract
Abstract An orthopedic fixation screw for anchoring a bone graft in a bore formed in a bone mass. An elongate cylindrical nose portion has a substantially smooth outer surface for being received without interference into the space between the graft and a wall of the bore. A threaded portion interferingly engages the graft and a wall of the bore as said threaded portion is rotated when the nose portion is so received. An hexagonal socket in the rear of the screw receives either a driver having tapered hexagonal walls for tightly receiving the screw on the driver during installation or a conventional hex driver for removing an installed screw in the event the tapered driver is unavailable when the screw is to be removed.
Inventors
- 👤 Randall J. Huebner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:01
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/08; A61F2/0811; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/84; A61B17/86; A61B17/8645; A61B17/88; A61B17/8875; A61F2002/0847; A61F2002/0858; A61F2002/087; A61F2002/0876; A61F2002/0882; A61F2002/0888; A61F2/28; A61F2002/2835; Y; Y10; Y10S; Y10S606/00; Y10S606/916
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
203 words
A method for securing a bone graft in an endosteal tunnel comprising the steps of: drilling an endosteal bore of a size sufficient to form a space between said bone graft and a wall of the bore when said graft is inserted in said bore, said bore having an open end and a closed end; inserting the graft in the open end of the bore; providing an uncannulated bone screw having a cylindrical elongate nose, a substantially hemispherical leading face, and a tapered root adjacent said nose, said nose having a diameter less than the root diameter and further having a smooth surface adapted for sliding without rotation and without cutting bone into said space with said bore wall and said graft abutting said nose; orienting the longitudinal axis of the bone screw responsive to fully inserting the nose thereof into said space without rotation and without cutting bone while said bore wall and said graft abut said nose; thereafter rotating said screw until the threads thereon begin to engage said bone graft and said bore wall; and continuing screw rotation until the threads of said screw fully engage said bone graft and said bore wall thereby fixing said graft in said bore.
Claim 2
Independent Claim
203 words
A method for securing a bone graft in an endosteal tunnel comprising the steps of: drilling an endosteal bore of a size sufficient to form a space between said bone graft and a wall of the bore when said graft is inserted in said bore, said bore having an open end and a closed end; inserting the graft in the open end of the bore; providing an uncannulated bone screw having a cylindrical elongate nose, a substantially hemispherical leading face, and a tapered root adjacent said nose, said nose having a diameter less than the root diameter and further having a smooth surface adapted for sliding without rotation and without cutting bone into said space with said bore wall and said graft abutting said nose; orienting the longitudinal axis of the bone screw responsive to fully inserting the nose thereof into said space without rotation and without cutting bone while said bore wall and said graft abut said nose; thereafter rotating said screw until the threads thereon begin to engage said bone graft and said bore wall; and continuing screw rotation until the threads of said screw fully engage said bone graft and said bore wall thereby fixing said graft in said bore.
Claim 3
Dependent Claim
41 words
The method of claim 1 wherein said bone screw further includes a cylindrical root portion adjacent said tapered root and where the thread depth on said tapered root is substantially the same as the thread depth on said cylindrical root portion.
References Cited (Backward Citations)
US2382019A
Cited
US3741205A
Cited
US4041939A
Cited
CH643131A5
Cited
US4632100A
Cited
US4772286A
Cited
US4870957A
Cited
US4950270A
Cited
US4927421A
Cited
US5019080A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-08-09 | 1997-02-08 | 1997-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-09 | 2001-02-08 | 2001-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-09 | 2005-02-08 | 2005-08-10 | $7700.00 | Window Closed / Lapsed |