Orthopedic fasteners, instruments and methods
Examples of the invention relate to methods, implants, and instruments for compressing first and second bone portions or a bone portion and an implant together.
1. A bone fastener comprising:
an insertion axis;
a body with a generally planar configuration having opposed planar sides spaced apart a body thickness, the body extending between a distal body leading end and a proximal body trailing end, the body leading end and the body trailing end being spaced from one another longitudinally relative to the insertion axis, the opposed planar sides converging toward the body trailing end to define a trailing edge having a trailing edge thickness less than the body thickness;
a first leg connected to the body, the first leg having a first elongate inboard surface facing the insertion axis and extending from a first leg leading end to a first leg trailing end, the first elongate inboard surface being spaced from the insertion axis a first leading distance at the leading end and the first elongate inboard surface being spaced from the insertion axis a first trailing distance at the trailing end, the first leading distance being greater than the first trailing distance; and
a second leg connected to the body, the second leg having a second elongate inboard surface facing the insertion axis and extending from a second leg leading end to a second leg trailing end, the second elongate inboard surface being spaced from the insertion axis a second leading distance at the leading end and the second elongate inboard surface being spaced from the insertion axis a second trailing distance at the trailing end, the second leading distance being equal to or greater than the second trailing distance;
wherein the first leg has a first elongate outboard surface facing away from the insertion axis and extending at least half of the distance from the first leg leading end to the first leg trailing end and the second leg has a second elongate outboard surface facing away from the insertion axis and extending at least half of the distance from the first leg leading end to the first leg trailing end, the first and second elongate outboard surfaces each being parallel to the insertion axis.
2. The bone fastener of claim 1 wherein the body has a proximal body leading end and a distal body trailing end, the body leading end and the body trailing end being spaced from one another longitudinally relative to the insertion axis.
3. The bone fastener of claim 2 wherein the trailing end of each of the first and second legs extends proximally beyond the trailing edge of the body.
4. The bone fastener of claim 2 further comprising an aperture through the body, the aperture having a length and a width, the aperture length being greater than the aperture width, the aperture length being oriented transverse to the insertion axis.
5. A bone fastener construct stabilizing a first bone portion relative to a second abutting bone portion, the construct comprising:
an insertion axis along which the fastener moves as it is inserted into or removed from a bone;
a body and an aperture through the body, the aperture having a length and a width, the aperture length being greater than the aperture width, the aperture length being oriented transverse to the insertion axis;
a first leg connected to the body, the first leg having a first elongate inboard surface facing the insertion axis and extending from a first leg leading end to a first leg trailing end, the first elongate inboard surface being spaced from the insertion axis a first leading distance at the leading end and the first elongate inboard surface being spaced from the insertion axis a first trailing distance at the trailing end, the first leading distance being equal to or greater than the first trailing distance; and
a second leg connected to the body, the second leg having a second elongate inboard surface facing the insertion axis and extending from a second leg leading end to a second leg trailing end, the second elongate inboard surface being spaced from the insertion axis a second leading distance at the leading end and the second elongate inboard surface being spaced from the insertion axis a second trailing distance at the trailing end, the second leading distance being equal to or greater than the second trailing distance, wherein at least part of the first elongate inboard surface diverges from at least part of the second elongate inboard surface; and
an elongate fixation member positioned within the aperture and engaging at least one of the first and second bone portions.
6. The bone fastener construct of claim 5 wherein the first leg has a first elongate outboard surface facing away from the insertion axis and extending at least half of the distance from the first leg leading end to the first leg trailing end and the second leg has a second elongate outboard surface facing away from the insertion axis and extending at least half of the distance from the first leg leading end to the first leg trailing end, the first and second elongate outboard surfaces each being parallel to the insertion axis.
7. The bone fastener construct of claim 5 wherein the trailing end of each of the first and second legs extends beyond the trailing edge of the body.
8. The bone fastener construct of claim 5 wherein the elongate fixation member engages both the first and second bone portions.
9. The bone fastener construct of claim 5 further comprising a guide having a guide axis, the guide being mounted to the fastener in rotating relationship, the guide being rotatable between a plurality of positions in which the guide axis intersects the aperture.
10. The bone fastener construct of claim 9 wherein the aperture defines a central axis parallel to the insertion axis, the guide being mounted for rotation about the central axis between a plurality of rotated positions, the guide axis intersecting the central axis in each of the plurality of rotated positions.
11. The bone fastener construct of claim 9 further comprising an elongate fixation member having a longitudinal axis and a width measured normal to the longitudinal axis, wherein the guide and fastener define at least one stop that limits the rotation of the guide relative to the fastener in at least one direction to an included angle between the guide axis and the aperture having a value corresponding to a projected length of the aperture along the guide axis equal to or greater than the width of the fixation member.
12. A bone fastener construct stabilizing a first bone portion relative to a second abutting bone portion, the construct comprising:
an insertion axis along which the fastener moves as it is inserted into or removed from a bone;
a body and an aperture through the body, the aperture having a length and a width, the aperture length being greater than the aperture width, the aperture length being oriented transverse to the insertion axis;
a first leg connected to the body, the first leg having a first elongate inboard surface facing the insertion axis and extending from a first leg leading end to a first leg trailing end, the first elongate inboard surface being spaced from the insertion axis a first leading distance at the leading end and the first elongate inboard surface being spaced from the insertion axis a first trailing distance at the trailing end, the first leading distance being equal to or greater than the first trailing distance; and
a second leg connected to the body, the second leg having a second elongate inboard surface facing the insertion axis and extending from a second leg leading end to a second leg trailing end, the second elongate inboard surface being spaced from the insertion axis a second leading distance at the leading end and the second elongate inboard surface being spaced from the insertion axis a second trailing distance at the trailing end, the second leading distance being equal to or greater than the second trailing distance, wherein at least part of the first elongate inboard surface diverges from at least part of the second elongate inboard surface; and
a guide having a guide axis, the guide being mounted to the fastener in rotating relationship, the guide being rotatable between a plurality of positions in which the guide axis intersects the aperture.
13. The bone fastener construct of claim 12 wherein the first leg has a first elongate outboard surface facing away from the insertion axis and extending at least half of the distance from the first leg leading end to the first leg trailing end and the second leg has a second elongate outboard surface facing away from the insertion axis and extending at least half of the distance from the first leg leading end to the first leg trailing end, the first and second elongate outboard surfaces each being parallel to the insertion axis.
14. The bone fastener construct of claim 12 wherein the trailing end of each of the first and second legs extends beyond the trailing edge of the body.
15. The bone fastener construct of claim 12 further comprising an elongate fixation member positioned within the aperture and engaging at least one of the first and second bone portions.
16. The bone fastener construct of claim 15 wherein the elongate fixation member engages both the first and second bone portions.
17. The bone fastener construct of claim 12 wherein the aperture defines a central axis parallel to the insertion axis, the guide being mounted for rotation about the central axis between a plurality of rotated positions, the guide axis intersecting the central axis in each of the plurality of rotated positions.
18. The bone fastener construct of claim 12 further comprising an elongate fixation member having a longitudinal axis and a width measured normal to the longitudinal axis, wherein the guide and fastener define at least one stop that limits the rotation of the guide relative to the fastener in at least one direction to an included angle between the guide axis and the aperture having a value corresponding to a projected length of the aperture along the guide axis equal to or greater than the width of the fixation member.