Cannulated self-tapping bone screw
AssigneeBoehringer Mannheim GmbH
InventorsJerald A. Bowman, Richard V. Zile
Life of this patent
Estimating the term…
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.
Claims14
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.
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.
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.
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.
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.
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.
Dependencies are inferred from the claim text.