DRILL BIT AND SUBCORTICAL EXPANDING BONE ANCHOR FOR TENODESIS
A drill bit for bone surface preparation and creation of a shallow pilot hole and a bone anchor. The drill bit includes a shaft extending to a distal end, the distal end having a drill tip, a sharp point extending distally from the drill tip, and a stop extending around the shaft at the drill tip, the stop having one or more cutting edges and a diameter that is greater than a diameter of the shaft. The bone anchor includes a body having at least two opposing openings forming a window extending through the body, an expansion member having a pair of connected and spaced wings, the expansion member extending at least partially into the window in the body, and a fixation mechanism comprising an adjustable loop, the adjustable loop extending between the pair of connected and spaced wings in the window of the body.
1 . A drill bit comprising:
a shaft extending to a distal end, the distal end having a drill tip;
a sharp point extending distally from the drill tip; and
a stop extending around the shaft at the drill tip, the stop having one or more cutting edges and a diameter that is greater than a diameter of the shaft.
2 . The drill bit of claim 1 , wherein the stop is a cylindrical collar.
3 . The drill bit of claim 1 , further comprising one or more recesses extending through an outer surface of the stop.
4 . The drill bit of claim 3 , wherein the one or more recesses extend to the one or more cutting edges.
5 . The drill bit of claim 3 , wherein an inner surface of the stop extends from the one or more recesses to the one or more cutting edges along an axis and the shaft extends along a central longitudinal axis that is substantially perpendicular to the axis.
6 . The drill bit of claim 1 , wherein an outer surface of the stop is smooth.
7 . The drill bit of claim 1 , wherein the drill tip comprises one or more flat faces.
8 . The drill bit of claim 7 , wherein two of the one or more flat faces oppose each other and converge at the sharp point.
9 . The drill bit of claim 1 , wherein the sharp point is substantially triangular and increases in width in a proximal direction.
10 . A bone anchor comprising:
a body having at least two opposing openings forming a window extending through the body;
an expansion member having a pair of connected and spaced wings, the expansion member extending at least partially into the window in the body; and
a fixation mechanism comprising an adjustable loop, the adjustable loop extending between the pair of connected and spaced wings in the window of the body.
11 . The bone anchor of claim 10 , further comprising two top openings extending through a top surface of the body.
12 . The bone anchor of claim 11 , wherein the fixation mechanism extends through the two top openings in the top surface of the body.
13 . The bone anchor of claim 10 , further comprising an interface at a top surface of the body.
14 . The bone anchor of claim 10 , further comprising an abrasive feature on the body.
15 . The bone anchor of claim 10 , further comprising a projection on the expansion member extending between the pair of connected and spaced wings.
16 . The bone anchor of claim 15 , wherein the projection extends into the window of the body.
17 . The bone anchor of claim 16 , further comprising a first channel extending between one wing of the pair of connected and spaced wings and a first side of the projection.
18 . The bone anchor of claim 17 , further comprising a second channel extending between the other wing of the pair of connected and spaced wings and a second side of the projection.
19 . The bone anchor of claim 18 , wherein the adjustable loop extends within the first and second channels.
20 . The bone anchor of claim 10 , wherein the fixation mechanism is a length of suture having a first limb and a second limb extending from the adjustable loop.