Multi-axial bone screw assembly

Details Multi-axial bone screw assembly Multi-axial bone screw assembly

1997-02-11

1999-03-23

Tucker, Guy V.

Surgery

Instruments

Orthopedic instrumentation

606 73, A61B 1770

Patent

active

058852867

ABSTRACT:
A multi-axial bone engaging fastener assembly includes a bone screw having a partially spherical head. The bone screw head is truncated at an upper surface in which a tool receiving recess is defined. The assembly includes a receiver member including a central bore that defines a tapered recess to receive the head of the bone screw. The bore of the receiver member also defines a channel communicating with the recess and configured to receive a spinal rod therein. A portion of the channel is threaded to receive a set screw above the rod. The assembly also includes a crown member disposed between the rod and the head of the bone screw. As the set screw is tightened into the receiver member, the set screw compresses the rod against the crown member, which presses the head of the bone screw into the tapered recess. In one embodiment, the head of the bone screw includes a flared edge that penetrates at least the crown member as the assembly is tightened. In another embodiment, the bone screw head includes a plurality of circumferential ridges configured to bite into the crown member. In a further aspect, the crown member is threaded to be inserted into the receiver member by threading through the threaded portion of the receiver member.

REFERENCES:
patent: 4805602 (1989-02-01), Puno et al.
patent: 4946458 (1990-08-01), Harms et al.
patent: 5092867 (1992-03-01), Harms et al.
patent: 5207678 (1993-05-01), Harms et al.
patent: 5360431 (1994-11-01), Puno et al.
patent: 5443467 (1995-08-01), Bidermann et al.
patent: 5466237 (1995-11-01), Byrd, III et al.
patent: 5474555 (1995-12-01), Puno et al.
patent: 5476464 (1995-12-01), Metz-Stavenhagen et al.
patent: 5520690 (1996-05-01), Errico et al.
patent: 5531746 (1996-07-01), Errico et al.
patent: 5549608 (1996-08-01), Errico et al.
patent: 5554157 (1996-09-01), Errico et al.
patent: 5575792 (1996-11-01), Errico et al.
patent: 5578033 (1996-11-01), Errico et al.
patent: 5584834 (1996-12-01), Errico et al.
patent: 5586984 (1996-12-01), Errico et al.
patent: 5607426 (1997-03-01), Ralph et al.
patent: 5609593 (1997-03-01), Errico et al.
patent: 5609594 (1997-03-01), Errico et al.
Sofamor Danek Meeting, May 2, 1996, entitled Implemedics.

Affiliated with

Also associated with

Rating

Multi-axial bone screw assembly does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Multi-axial bone screw assembly, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multi-axial bone screw assembly will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2121037