A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
A61B 17/70 (2006.01) A61B 17/86 (2006.01) A61B 17/88 (2006.01)
Patent
CA 2321803
A pedicle screw assembly includes a fastener 30 including a tip end 32 for insertion into bone 90 and an expandable head 34 at the opposite end of the fastener. The expandable head 34 has an outer surface 44 including a convex portion, a recess 46 having an inner surface 48 and defining an inner dimension, and at least one slot 50 extending between the inner and outer surfaces thereof for allowing expansion of the head. The assembly also has an insert 56 which can be positioned at least partially in the recess 46, the insert 56 having an outer surface 62 and defining an outer dimension that is greater than the inner dimension of the recess 46. The assembly includes a coupling element 70 including a rod receiving opening 94, a bore 80 for receiving the head of the fastener 30, and a seat 88 for receiving the head 34 of the fastener, the seat 88 including a concave portion for receiving the convex portion of the head and allowing the fastener 30 to pivot relative to the coupling element 70 before being locked therein. After an orthopedic rod 92 has been positioned within the coupling element 70, a locking element 96 associated with the coupling element locks the orthopedic rod 92 in the rod-receiving opening 94. The locking element 96 is adapted to be forced against an orthopedic rod arranged in the rod receiving opening 94, to in turn force the insert 56 into the recess of the expandable head 34 so that the outer dimension 62 of the insert 56 bears against the inner dimension 48 of the head 34, thereby expanding the outer surface 44 of the head against the seat 88 of the coupling element 70 for locking the fastener 30 from further pivotal movement relative to the coupling element 70. In other preferred embodiments, the head is expandable by virtue of the material of which it is made such as carbon fiber.
Crozet Yves
Martin Gregory
Howmedica Osteonics Corp.
Smart & Biggar
Stryker Spine
LandOfFree
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