Revisable orthopedic anchor and methods of use

摘要

A revisable orthopedic anchor and method of use for removably securing an anchor in bone, such as compromised or degenerated bone, is described herein. In one embodiment, the anchor makes use of dual probes and vector divergence of the distal tips of the probes to achieve superior bone purchase and pull-out resistance. In such an embodiment, the probes can be inserted one at a time into a hole formed in, for example, the pedicle bone. After the probes are inserted and joined at the proximal end, they have a greater pull-out resistance than a threaded anchor. Removing the anchor involves separating the proximal heads and reversing the implantation process. As a result of the unique bone anchor design disclosed herein, the devices and methods of the present invention allow for less complicated implantation and removal of orthopedic anchors, all while providing enhanced bone purchase when implanted in a patient.

主权项

1. A bone anchor member configured to be implanted in bone, comprising:
a first probe component in the form of an elongate member having a proximal head and a distal tip, a bone engaging edge having a plurality of barbs, an opposed edge, an external surface, and an opposed internal surface having a guide shoulder formed thereon, the guide shoulder extending in a diagonal curve across the internal surface of the first probe component; and a second probe component in the form of an elongate member having a proximal head and a distal tip, a bone engaging edge having a plurality of barbs, a mating edge having a profile complementary to the guide shoulder and being configured to be seated along the guide shoulder, an external surface, and an opposed internal surface; wherein the first and second probe components are configured to be assembled to form a bone anchor such that the barbed bone engaging edges of the first probe component and the second probe component face away from one another, the external surfaces of the first probe component and the second probe component face away from one another, the mating edge of the second probe component is seated along the guide shoulder of the first probe component, and a distal tip of each probe component diverges away from a central longitudinal axis of the bone anchor such that a distance between the first probe component and the second probe component increases from a proximal end of the bone anchor to a distal end of the bone anchor; and wherein the internal surfaces of the first probe component and the second probe component are substantially planar.