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 bone tissue, comprising:
a first leg for anchoring in a first bone or bone fragment,
a second leg for anchoring in a second bone or bone fragment, and
an elastically deformable bridge monolithically formed with the first leg and the second leg, the bridge having a lower surface for seating against the bone tissue and an opposite upper surface, the bridge defining a longitudinal axis, the bridge having a first end section from which the first leg extends and a second end section opposite the first end section from which the second leg extends,
a first engagement portion at the first end section, the first engagement portion wider than the lower surface, and
a second engagement portion at the second end section, the second engagement portion wider than the lower surface,
wherein in a relaxed configuration, the bridge is bent or curved such that a central region of the bridge is directed away from the first and second legs, and 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,
wherein the bridge is elastically deformable to orient the first and second legs parallel to each other, and
when the first and second legs are parallel to each other, the lower surfaces of the first and second engagement portions are parallel to the lower surface of the bridge.
2. The surgical staple of claim 1 , wherein the staple is symmetrical about the longitudinal axis.
3. The surgical staple of claim 1 , wherein the staple is asymmetrical about the longitudinal axis.
4. The surgical staple of claim 1 , wherein the bridge has a first side and a second side, and the first and second engagement portions extend to the first side of the bridge and not the second side of the bridge.
5. The surgical staple of claim 1 , wherein the first engagement portion includes an upper surface and a lower surface, and the lower surface of the first engagement portion is situated between the upper surface of the bridge and the lower surface of the bridge, the second engagement portion includes an upper surface and a lower surface, and the lower surface of the second engagement portion is situated between the upper surface of the bridge and the lower surface of the bridge.
6. The surgical staple of claim 1 , wherein the lower surfaces of the first and second engagement portions are flat.
7. The surgical staple of claim 1 , wherein the upper surfaces of the first and second engagement portions are co-extensive with the first and second end sections of the bridge.
8. The surgical staple of claim 1 , wherein the first end section of the bridge and the first engagement portion together define a T-shape portion of the bridge, and the second end section of the bridge and the second engagement portion together define another T-shape portion of the bridge.
9. The surgical staple of claim 1 , wherein the surgical staple comprises a shape memory material exhibiting superelastic properties.
10. A surgical staple insertion system for compressing bones or bone fragments, comprising:
a) the surgical staple of claim 1 ; and
b) an insertion tool separately formed from the staple and including a first end and a second end, the second end having engagement structures adapted to extend around or under the engagement portions of the bridge and hold the staple in a deformed configuration in which the first and second legs are retained parallel to each other.
11. The system of claim 10 , wherein the insertion tool includes arms provided with pressing portions and the engagement structures, the arms movable relative to each other, and movement of the arms relative to each other moves the staple into the deformed configuration.
12. A surgical staple for compressing bone tissue, comprising:
a first leg for anchoring in a first bone or bone fragment,
a second leg for anchoring in a second bone or bone fragment, and
an elastically deformable bridge monolithically formed with the first leg and the second leg, the bridge having a lower surface for seating against the bone tissue and an opposite upper surface, the bridge defining a longitudinal axis, the bridge having a first end section from which the first leg extends and a second end section opposite the first end section from which the second leg extends, the bridge is elastically deformable to orient the first and second legs parallel to each other,
a first engagement portion at the first end section, the first engagement portion having an upper surface and a lower surface, the lower surface of the first engagement portion situated below the upper surface of the bridge and above the lower surface of the bridge,
a second engagement portion at the second end section, the second engagement portion having an upper surface and a lower surface, and the lower surface of the second engagement portion situated below the upper surface of the bridge and above the lower surface of the bridge,
wherein in a relaxed configuration, the bridge is bent or curved such that a central region of the bridge is directed away from the first and second legs, and 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, and
when the first and second legs are parallel to each other, the lower surfaces of the first and second engagement portions are parallel to the lower surface of the bridge.
13. The surgical staple of claim 12 , wherein the longitudinal axis extends through the first and second engagement portions.
14. The surgical staple of claim 12 , wherein the staple is symmetrical about the longitudinal axis.
15. The surgical staple of claim 12 , wherein the staple is asymmetrical about the longitudinal axis.
16. The surgical staple of claim 12 , wherein the bridge has a first side and a second side, and the first and second engagement portions extend to the first side of the bridge and not the second side of the bridge.
17. The surgical staple of claim 12 , wherein the lower surfaces of the first and second engagement portions are flat.
18. The surgical staple of claim 12 , wherein the upper surfaces of the first and second engagement portions are co-extensive with the first and second end sections of the bridge.
19. The surgical staple of claim 12 , wherein the first end section of the bridge and the first engagement portion together define a T-shape portion of the bridge, and the second end section of the bridge and the second engagement portion together define another T-shape portion of the bridge.
20. The surgical staple of claim 12 , wherein the surgical staple comprises a shape memory material exhibiting superelastic properties.
21. A surgical staple insertion system for compressing bones or bone fragments, comprising:
a) the surgical staple of claim 12 ; and
b) an insertion tool separately formed from the staple and including a first end and a second end, the second end having engagement structures adapted to extend around or under the engagement portions of the bridge and hold the staple in a deformed configuration in which the first and second legs are retained parallel to each other.
22. The system of claim 21 , wherein the insertion tool includes arms provided with pressing portions and the engagement structures, the arms movable relative to each other, and movement of the arms relative to each other moves the staple into the deformed configuration.