US4950270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cannulated self-tapping bone screw
Assignee: Ethicon Inc
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Filing: 1989-02-03
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Granted: 1990-08-21
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Expires: 2009-02-03
Abstract
Abstract A fluted and cannulated self-tapping bone screw which can be guided into proper position using a guide pin that slidably fits in the cannula of the bone screw. The flutes have cutting edges centered on axial centerline of the cannula.
Inventors
- 👤 Jerald A. Bowman
- 👤 Richard V. Zile
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:38
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/08; A61F2/0811; A61B; A61B17/00; A61B17/16; A61B17/17; A61B17/1714; A61B17/56; A61B17/58; A61B17/68; A61B17/84; A61B17/86; A61B17/8645; A61B17/88; A61B17/8875; F; F16; F16B; F16B23/00; F16B23/0007; F16B23/0023; A61B17/1739; A61B17/1764; A61B17/8605; A61B17/861; A61F2002/0817; A61F2002/0841; A61F2002/0847; A61F2002/0858; A61F2002/087; A61F2002/0876; A61F2002/0882; Y; Y10; Y10S; Y10S606/00; Y10S606/907; Y10S606/908
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
96 words
A bone screw and bone plug assembly for securing bone plugs into a bone comprising: a bone screw having an axial cannula with an internal diameter and an exterior screw threading; a bone plug; engaging means for driving insertion of the bone screw into the bone and bone plug; at least two fluted grooves cut into said screw threading, to permit self-tapping of said bone screw into both said bone and bone plug; a guide pin having a diameter smaller than the internal diameter of said axial cannula, thereby permitting guided insertion of the bone screw.
Claim 2
Dependent Claim
96 words
A bone screw and bone plug assembly for securing bone plugs into a bone comprising: a bone screw having an axial cannula with an internal diameter and an exterior screw threading; a bone plug; engaging means for driving insertion of the bone screw into the bone and bone plug; at least two fluted grooves cut into said screw threading, to permit self-tapping of said bone screw into both said bone and bone plug; a guide pin having a diameter smaller than the internal diameter of said axial cannula, thereby permitting guided insertion of the bone screw.
Claim 3
Dependent Claim
18 words
The apparatus of claim 1 wherein a surface of the bone screw is composed of an osteointegrative material.
Claim 4
Dependent Claim
24 words
The apparatus of claim 1 wherein the at least two fluted grooves cut into said screw threading are equally spaced around the bone screw.
Claim 5
Dependent Claim
18 words
The apparatus of claim 1 wherein the engaging means is a socket cavity formed in said bone screw.
Claim 6
Independent Claim
91 words
A method for securing a bone plug element to a bone comprising the steps of: forming a bone borehole; inserting a bone plug into said borehole; situating a guide pin in the bone borehole adjacent to said plug; fitting a bone screw having a bone screw threading, an axial cannula with a diameter greater than said guide pin, and an at least two fluted grooves cut into the bone screw threading to enable self-tapping, onto the guide pin; and screwing the bone screw into both said bone and said bone plug.
Claim 7
Independent Claim
91 words
A method for securing a bone plug element to a bone comprising the steps of: forming a bone borehole; inserting a bone plug into said borehole; situating a guide pin in the bone borehole adjacent to said plug; fitting a bone screw having a bone screw threading, an axial cannula with a diameter greater than said guide pin, and an at least two fluted grooves cut into the bone screw threading to enable self-tapping, onto the guide pin; and screwing the bone screw into both said bone and said bone plug.
Claim 8
Dependent Claim
99 words
A bone screw and bone plug assembly for securing bone plugs into bore in a bone; a bone plug; an elongated screw body formed to include an axial cannula and external screw threads; at least one fluted groove found in the screw threads at a position substantially adjacent one end of the screw body and parallel to a central longitudinal axis of the screw body; and a drive recess formed in the other end of the screw body for receiving a drive device to permit the bone screw to be simultaneously screwed into the bone and the bone plug.
Claim 9
Dependent Claim
99 words
A bone screw and bone plug assembly for securing bone plugs into bore in a bone; a bone plug; an elongated screw body formed to include an axial cannula and external screw threads; at least one fluted groove found in the screw threads at a position substantially adjacent one end of the screw body and parallel to a central longitudinal axis of the screw body; and a drive recess formed in the other end of the screw body for receiving a drive device to permit the bone screw to be simultaneously screwed into the bone and the bone plug.
Claim 10
Dependent Claim
51 words
The bone screw and bone plug assembly of claim 6, wherein the at least one fluted groove includes a radially inner edge and a radially outer edge and wherein the radially inner edge is generally parallel to and in alignment with a plane extending through the center of the axial cannula.
Claim 11
Dependent Claim
34 words
The bone screw and bone plug assembly of claim 7, wherein there are four fluted grooves formed in the screw threads, with the four grooves equally spaced around the circumference of the screw body.
Claim 12
Dependent Claim
61 words
The bone screw and bone plug assembly of claim 7, wherein the at least one fluted groove extends from the position substantially adjacent the one end of the screw body a specified distance toward the other end of the screw body, and wherein the depth of the fluted groove decreases in the direction from the first end toward the second end.
Claim 13
Dependent Claim
109 words
A bone screw and bone plug assembly for securing bone plugs into a bone comprising: a bone screw having an axial cannula with an internal diameter and an exterior screw threading; a bone plug; engaging means for driving insertion of the bone screw into the bone and bone plug; said bone screw exterior screw threading being able to be screwed into both said bone and bone plug to securely position the bone plug with respect to the bone through an interference fit with the bone screw; a guide pin having a diameter smaller than the internal diameter of said axial cannula, thereby permitting guided insertion of the bone screw.
Claim 14
Dependent Claim
109 words
A bone screw and bone plug assembly for securing bone plugs into a bone comprising: a bone screw having an axial cannula with an internal diameter and an exterior screw threading; a bone plug; engaging means for driving insertion of the bone screw into the bone and bone plug; said bone screw exterior screw threading being able to be screwed into both said bone and bone plug to securely position the bone plug with respect to the bone through an interference fit with the bone screw; a guide pin having a diameter smaller than the internal diameter of said axial cannula, thereby permitting guided insertion of the bone screw.
Claim 15
Dependent Claim
18 words
The apparatus of claim 10 wherein a surface of the bone screw is composed of an osteointegrative material.
Claim 16
Dependent Claim
18 words
The apparatus of claim 10 wherein the engaging means is a socket cavity formed in said bone screw.
Claim 17
Independent Claim
95 words
A method for securing a bone plug element to a bone comprising the steps of: forming a bone borehole; inserting a bone plug into said borehole; situating a guide pin in the bone borehole adjacent to said plug; fitting a bone screw having a bone screw threading and an axial cannula with a diameter greater than said guide pin, onto the guide pin; and screwing the bone screw into both said bone and said bone plug to securely position the bone plug with respect to the bone through an interference fit with the bone screw.
Claim 18
Independent Claim
95 words
A method for securing a bone plug element to a bone comprising the steps of: forming a bone borehole; inserting a bone plug into said borehole; situating a guide pin in the bone borehole adjacent to said plug; fitting a bone screw having a bone screw threading and an axial cannula with a diameter greater than said guide pin, onto the guide pin; and screwing the bone screw into both said bone and said bone plug to securely position the bone plug with respect to the bone through an interference fit with the bone screw.
Claim 19
Dependent Claim
108 words
A bone screw and bone plug assembly for securing bone plugs into bore in a bone; a bone plug; an elongated screw body formed to include an axial cannula and external screw threads at a position substantially adjacent one end of the screw body and parallel to a central longitudinal axis of the screw body; and a drive recess formed in the other end of the screw body for receiving a drive device to permit the bone screw to be simultaneously screwed into the bone and the bone plug to securely position the bone plug with respect to the bone through an interference fit with the bone screw.
Claim 20
Dependent Claim
108 words
A bone screw and bone plug assembly for securing bone plugs into bore in a bone; a bone plug; an elongated screw body formed to include an axial cannula and external screw threads at a position substantially adjacent one end of the screw body and parallel to a central longitudinal axis of the screw body; and a drive recess formed in the other end of the screw body for receiving a drive device to permit the bone screw to be simultaneously screwed into the bone and the bone plug to securely position the bone plug with respect to the bone through an interference fit with the bone screw.
References Cited (Backward Citations)
US2242003A
Cited
US2267925A
Cited
FR94371E
Cited
US4463753A
Cited
US4537185A
Cited
US4744793A
Cited
EP0282789B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-08-20 | 1994-02-19 | 1994-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-20 | 1998-02-19 | 1998-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-20 | 2002-02-19 | 2002-08-21 | $7700.00 | Window Closed / Lapsed |