closure for rod receiving orthopedic implant having a pair of spaced apertures for removal
OwnerRoger P. Jacksoninventor
Life of this patent
Estimating the term…
Abstract
An anti-splay closure with a pair of spaced removal apertures, includes a cylindrical closure body with an external, continuous, helically extending anti-splay guide and advancement flange and a breakaway installation head. The removal apertures are spaced from and parallel to an axis of the closure body and are also spaced from a radially outer surface of the body. The apertures are sized and shaped to receive a removal tool having prongs with a complementary shape to the bores. The closure is used with an open headed bone implant screw which is provided with internal, helically extending mating guide and advancement structure complementary to the flange of the closure body.
Claims20
A closure for setting engagement with a structural member and comprising:
- (a) a substantially cylindrical body having an outer cylindrical surface relative to a central closure axis;
- (b) a substantially continuous guide and advancement flange extending helically about said outer cylindrical surface in a forward advancement direction relative to said closure axis, said flange having a leading surface and a trailing surface relative to said forward advancement direction;
- (c) at least one of said leading surface or said trailing surface being compound in contour and including an inward anti-splay surface component facing generally toward said closure axis;
- (d) an installation head for rotating and torquing said body to a preselected torque;
- and
- (e) said body having a pair of spaced apertures that intersect with a rear surface of said closure body and that are parallel to and spaced from said closure axis and a radially outer surface of said closure body;
- said apertures being sized and shaped to be adapted to receive a removal tool for removing said body subsequent to installation.
The closure as set forth in claim land including:
- (a) said closure having a forward end relative to said forward advancement direction;
- and
- (b) said body having a V-shaped set ring and an axially aligned point formed on said leading end to enhance setting engagement of said closure into a surface of a structural member.
A closure for setting engagement with a structural member and comprising:
- (a) a body having an outer cylindrical surface relative to a central closure axis and a driving installation head;
- (b) a guide and advancement flange extending helically and substantially continuously about said outer cylindrical surface in a forward advancement direction relative to said closure axis, said flange having a trailing surface relative to said forward advancement direction;
- (c) said trailing surface being compound in contour and including an inward anti-splay surface component facing generally toward said closure axis;
- and
- (d) said body having a pair of spaced apertures formed therein which are each elongated along and spaced from said closure axis;
- said bores opening onto a trailing surface of said body and extending substantially parallel to said closure axis and being spaced from said body outer surface;
- and said apertures being sized and shaped to receive a removal tool.
A closure for setting engagement with a structural member and including a substantially cylindrical body having an outer cylindrical surface relative to a central closure axis and a substantially continuous guide and advancement flange extending helically about said outer cylindrical surface in a forward advancement direction relative to said screw axis;
- said flange having a leading surface and a trailing surface relative to said forward advancement direction and a break away installation head;
- at least one of said leading surface or said trailing surface being compound in contour and including an inward anti-splay surface component facing generally toward said closure axis;
- and said body having a pair of spaced bores formed therein that are elongated along said closure axis with said bores opening onto a body trailing surface and being substantially parallel to said closure axis and spaced from the body outer surface.
Dependencies are inferred from the claim text.