Surgical staple and instrument for holding and implanting the surgical staple
A surgical staple insertion system for compressing bone fragments includes a staple and an insertion tool. The staple has first and second legs and an elastically deformable bridge monolithically formed with the first and second legs. In a relaxed configuration, the free ends of the first and second legs are positioned closer to one another than are portions of the first and second legs connected to the bridge. The insertion tool retains the bridge in an elastically deformed configuration with the legs positioned relatively farther apart from one another during at least portion of the step of implantation of the staple. Then, the insertion tool is released from the staple so that the bone fragments between the legs are subject to compression.
1. A surgical staple for compressing bones or bone fragments together, comprising:
a first naturally straight leg for anchoring in a first bone or bone fragment, the first leg having a first upper end and a first free end, and defining a first leg axis between the first upper end and the first free end;
a second naturally straight leg for anchoring in a second bone or bone fragment, the second leg having a second upper end and a second free end, and defining a second leg axis between the second upper end and the second free end; and
an elastically deformable bridge monolithically formed with the first leg and the second leg and extending from the first and second upper ends of the first and second legs, the bridge having,
a top surface and a bottom surface,
a length extending in a direction between the first and second legs and defining a bridge axis,
a bridge width extending transverse to both the length and the first and second leg axes, the bridge width constant between the first and second legs, and
a thickness extending between the top and bottom surfaces and transverse to both the length and bridge width,
the first and second legs each having a leg width extending in the same direction as the bridge width, wherein the bridge width is greater than the leg width,
the staple naturally in a first state in which at least a portion of the bridge is bent or curved and the first and second free ends of the first and second legs are positioned closer to one another than are the first and second upper ends of the first and second legs connected to the bridge, the staple movable into a second state in which the portion of the bridge is elastically deformed relative to the first state and the first and second legs each remain straight and extend parallel to each other.
2. The surgical staple of claim 1 , wherein an upper end of each of the legs adjacent the bridge is thicker to provide reinforcement.
3. The surgical staple of claim 1 , wherein the legs have teeth extending along a portion thereof.
4. The surgical staple of claim 1 , wherein the bridge of the staple is constructed of an elastic material.
5. The surgical staple of claim 4 , wherein the staple is constructed of nitinol.
6. The surgical staple of claim 1 , wherein the bridge width is constant.
7. The surgical staple of claim 1 , wherein the bridge width is symmetrical relative to the bridge axis.
8. The surgical staple of claim 1 , wherein the first and second leg axes intersect the bridge at an area at which the bridge width is maximum.
9. The surgical staple of claim 1 , wherein the bridge has oblique side surfaces between the top and bottom surfaces.
10. The surgical staple of claim 9 , wherein the oblique side surfaces angle inwards towards each other in a direction extending from the top surface to the bottom surface.
11. The surgical staple of claim 9 , wherein the oblique side surfaces taper from the bridge width to the leg width.
12. A surgical staple insertion system for compressing bones or bone fragments, comprising:
a) a surgical staple including,
a first naturally straight leg for anchoring in a first bone or bone fragment, the first leg having a first upper end and a first free end, and defining a first leg axis between the first upper end and the first free end,
a second naturally straight leg for anchoring in a second bone or bone fragment, the second leg having a second upper end and a second free end, and defining a second leg axis between the second upper end and the second free end, and
an elastically deformable bridge monolithically formed with the first leg and the second leg and extending from the first and second upper ends of the first and second legs, the bridge having,
a top surface and a bottom surface,
a length extending in a direction between the first and second legs and defining a bridge axis,
a bridge width extending transverse to both the length and the first and second leg axes, the bridge width constant between the first and second legs, and
a thickness extending between the top and bottom surfaces and transverse to both the length and bridge width,
the first and second legs each having a leg width extending in the same direction as the bridge width, wherein the bridge width is greater than the leg width,
the staple naturally in a first state in which at least a portion of the bridge is bent or curved, and the first and second free ends of the first and second legs are positioned closer to one another than are the first and second upper ends of the first and second legs connected to the bridge; and
b) an insertion tool including first and second engagement structures engaging a lower surface of the bridge, and a relatively central pressing portion for applying an upper counterforce to the bridge between the first and second engagement structures, the first and second engagement structures and central pressing portion retaining the bridge in a second state in which the bridge is elastically deformed relative to the first state, the first and second legs remaining straight and the first and second free ends of the first and second legs positioned farther from and parallel to one another when the bridge is retained in the insertion tool,
the insertion tool releasable from the staple.
13. The system of claim 12 , wherein the first and second engagement structures engage the bridge adjacent the first and second legs.
14. The system of claim 12 , the insertion tool is releasable from the staple by moving the insertion tool laterally relative to the bridge of the staple.
15. The system of claim 12 , wherein, in the second state, energy is stored in the bridge, and upon the release of the insertion tool from the staple, the stored energy biases the first and second legs toward each other and subjects the bone or bone fragments between the first and second legs to a compressive force.
16. The system of claim 12 , wherein the bridge includes oblique side surfaces above the bottom surface.
17. The system of claim 16 , wherein the oblique side surfaces are located above a plane that extends through the bottom surface when the bridge is in the second state.
18. The system of claim 16 , wherein the oblique side surfaces taper from the bridge width to the leg width.
19. A method of inserting a staple into a bone or bone fragments, comprising:
a) providing a surgical staple mounted on an insertion tool,
i) the surgical staple including,
a first naturally straight leg for anchoring in a first bone or bone fragment, the first leg having a first upper end and a first free end, and defining a first leg axis between the first upper end and the first free end,
a second naturally straight leg for anchoring in a second bone or bone fragment, the second leg having a second upper end and a second free end, and defining a second leg axis between the second upper end and the second free end, and
an elastically deformable bridge monolithically formed with the first leg and the second leg and extending from the first and second upper ends of the first and second legs, the bridge having,
a top surface and a bottom surface,
a length extending in a direction between the first and second legs and defining a bridge axis,
a bridge width extending transverse to both the length and the first and second leg axes, the bridge width constant between the first and second legs, and
a thickness extending between the top and bottom surfaces and transverse to both the length and bridge width,
the first and second legs each having a leg width extending in the same direction as the bridge width, wherein the bridge width is greater than the leg width
the staple naturally in a first state in which at least a portion of the bridge is bent or curved, and the first and second free ends of the first and second legs are positioned closer to one another than are the first and second upper ends of the first and second legs connected to the bridge, and
ii) the insertion tool including first and second engagement structures engaging a lower surface of the bridge, and a relatively central pressing portion for applying an upper counterforce to the bridge between the first and second engagement structures, the first and second engagement structures and central pressing portion retaining the bridge in a second state in which the bridge is elastically deformed relative to the first state, and the first and second free ends of the first and second legs are positioned farther from and parallel to one another when the bridge is retained in the insertion tool;
b) holding the insertion tool and directing the first and second legs of the staple toward the bone or bone fragments;
c) applying sufficient force to insert the first and second legs of the staple into the bone or bone fragments; and
d) releasing the bridge of the staple from the insertion tool to disengage the insertion tool from the staple and allow the first and second legs to apply a compressive force into the bone or bone fragments.
20. The method of claim 19 , wherein the first and second engagement structures engage the bridge adjacent the first and second legs.
21. The method of claim 19 , wherein the releasing includes moving the insertion tool laterally relative to the bridge of the staple.
22. A method of inserting a staple into a bone or bone fragments, comprising:
a) providing a surgical staple mounted on an insertion tool,
i) the surgical staple including,
a first naturally straight leg for anchoring in a first bone or bone fragment, the first leg having a first upper end and a first free end, and defining a first leg axis between the first upper end and the first free end,
a second naturally straight leg for anchoring in a second bone or bone fragment, the second leg having a second upper end and a second free end, and defining a second leg axis between the second upper end and the second free end, and
an elastically deformable bridge monolithically formed with the first leg and the second leg and extending from the first and second upper ends of the first and second legs, the bridge having,
a top surface and a bottom surface,
a length extending in a direction between the first and second legs and defining a bridge axis,
a bridge width extending transverse to both the length and the first and second leg axes, and
a thickness extending between the top and bottom surfaces and transverse to both the length and bridge width,
the first and second legs each having a leg width extending in the same direction as the bridge width, wherein the bridge width is greater than the leg width,
the staple naturally in a first state in which at least a portion of the bridge is bent or curved, and the first and second free ends of the first and second legs are positioned closer to one another than are the first and second upper ends of the first and second legs connected to the bridge, and
ii) the insertion tool having first and second engagement structures for engaging the bridge adjacent the first and second legs, and a relatively central pressing portion for applying an upper counterforce to the bridge, the first and second engagement structures and central pressing portion retaining the bridge in a second state in which the bridge is elastically deformed relative to the first state, the first and second legs remaining straight and the first and second free ends of the first and second legs are oriented parallel to one another when the bridge is retained in the insertion tool;
b) holding the insertion tool and directing the parallel first and second legs of the staple toward the bone or bone fragments;
c) applying sufficient force to insert the first and second legs of the staple into the bone or bone fragments; and
d) releasing the bridge of the staple from the insertion tool to disengage the insertion tool from the staple and allow the first and second legs to apply a compressive force into the bone or bone fragments.