Closure for rod receiving orthopedic implant having left handed thread removal
OwnerRoger P. Jacksoninventor
Life of this patent
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Abstract
An anti-splay closure with a left handed threaded removal bore, includes a cylindrical closure body with an external, continuous, helically extending anti-splay guide and advancement flange and a breakaway installation head. The removal bore is aligned with an axis of the closure body. The bore thread is sized and shaped to receive a removal tool having mating left handed thread. 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 guide and advancement flange extending helically about said outer cylindrical surface and having 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) a driving structure for rotating and torquing said body to a preselected torque;
- and
- (e) said body having an axially aligned bore opening on a trailing surface of said body;
- said bore having a left handed thread therein that is sized and shaped to be adapted to receive a removal tool with a mating left handed thread for removing said body subsequent to installation.
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 and having 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 an axially aligned bore formed therein that opens onto a trailing surface of said body;
- said bore having a helically wound left handed thread therein;
- said bore thread being sized and shaped to receive a removal tool having a mating left handed thread.
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 and having 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;
- 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 an axially aligned bore that opens onto a trailing surface of said body;
- said bore having a left handed helically wound thread sized and shaped to mate with a removal tool having a mating left handed thread.
Dependencies are inferred from the claim text.