Low profile staple and methods for using the same
A staple can include a bridge and two pairs of opposed legs that connect to the bridge. A first pair of legs can connect to the bridge toward a first end at a first shoulder and a second shoulder. A second pair of legs, opposed to the first pair legs, can connect to the bridge toward a second end at a third shoulder. The bridge can include a substantially smooth and non-breaking top surface that transitions downwardly at the first end and the second end to outer surfaces of the first pair of legs and the second pair of legs. The bridge can include a substantially constant moment of inertia, which may help improve performance and reduce risk of staple breakage.
1 . A staple comprising:
a bridge between radial tangents of two opposing legs, the bridge comprising:
a non-breaking top surface between a first edge and a second edge;
an apex of the top surface;
a first curved surface between the apex and the first edge;
a second curved surface between the apex and the second edge;
a first transition area transitioning the top surface of the bridge downwardly to an outer surface of each of two legs proximate a first side of the bridge, the first transition area comprising at least a portion of the top surface of the bridge and a first side surface with each of the two legs extending therefrom, such that the two legs extend from the first side surface, the first transition area being a first non-breaking surface connecting the top surface of the bridge and each of the two legs proximate the first side of the bridge;
a second transition area transitioning the top surface of the bridge downwardly to an outer surface of at least one leg proximate a second side of the bridge, the second transition area comprising at least a portion of the top surface of the bridge and a second side surface with the at least one leg extending therefrom, such that the at least one leg extends from the second side surface, the second transition area being a second non-breaking surface connecting the top surface of the bridge and the at least one leg proximate the second side of the bridge, wherein:
the staple is deformable from a relaxed position to a deformed position; and
strain in the bridge is greater than or equal to strain in the two legs or the at least one leg, thereby reducing a risk of breakage of the staple.
2 . The staple of claim 1 , wherein strain in a central region of the bridge is greater than strain in other portions of the bridge.
3 . The staple of claim 2 , wherein strain at the apex of the bridge is greater than strain in the first transition area or the second transition area.
4 . The staple of claim 3 , wherein each of the first side surface and the second side surface are curved, defining a radial transition between each of the two legs and the at least one leg and the bridge.
5 . The staple of claim 4 , wherein the bridge comprises:
a midpoint;
a first thickness at the midpoint;
a second thickness at the radial transition to the at least one leg.
6 . The staple of claim 5 , wherein the second thickness is greater than the first thickness.
7 . The staple of claim 6 , wherein a thickness of the bridge decreases linearly from the second thickness to the first thickness.
8 . The staple of claim 4 , wherein the two legs, at least one leg, and bridge are integrally formed and manufactured from a single piece of metal.
9 . The staple of claim 8 , wherein the staple comprises nitinol.
10 . The staple of claim 9 , wherein the first curved surface and the second curved surface form a constantly curved surface between the first edge and the second edge.
11 . The staple of claim 9 , wherein the apex comprises a flat portion between the first curved surface and the second curved surface.
12 . A method comprising:
inserting a staple into one or more bone fragments of a patient in a deformed position, the staple comprising:
a bridge between radial tangents of two opposing legs, the bridge comprising:
a non-breaking top surface between a first edge and a second edge;
an apex of the top surface;
a first curved surface between the apex and the first edge;
a second curved surface between the apex and the second edge;
a first transition area transitioning the top surface of the bridge downwardly to an outer surface of each of two legs proximate a first side of the bridge, the first transition area comprising at least a portion of the top surface of the bridge and a first side surface with each of the two legs extending therefrom, such that the two legs extend from the first side surface, the first transition area being a first non-breaking surface connecting the top surface of the bridge and each of the two legs proximate the first side of the bridge;
a second transition area transitioning the top surface of the bridge downwardly to an outer surface of at least one leg proximate a second side of the bridge, the second transition area comprising at least a portion of the top surface of the bridge and a second side surface with the at least one leg extending therefrom, such that the at least one leg extends from the second side surface, the second transition area being a second non-breaking surface connecting the top surface of the bridge and the at least one leg proximate the second side of the bridge, and:
causing the staple to attempt to move from the deformed position to a relaxed position such that the staple compresses the one or more bone fragments of the patient and strain in the bridge is greater than or equal to strain in the two legs or the at least one leg, thereby reducing a risk of breakage of the staple.
13 . The method of claim 12 , wherein strain in a central region of the bridge is greater than strain in other portions of the bridge.
14 . The method of claim 13 , wherein strain at the apex of the bridge is greater than strain in the first transition area or second transition area.
15 . The method of claim 14 , wherein each of the first side surface and the second side surface are curved, defining a radial transition between each of the two legs and the at least one leg and the bridge.
16 . The method of claim 15 , wherein the bridge comprises:
a midpoint;
a first thickness at the midpoint;
a second thickness at the radial transition to the at least one leg.
17 . The method of claim 16 , wherein the second thickness is greater than the first thickness.
18 . The method of claim 17 , wherein a thickness of the bridge decreases linearly from the second thickness to the first thickness.
19 . The method of claim 15 , wherein the first curved surface and the second curved surface form a constantly curved surface between the first edge and the second edge.
20 . The method of claim 15 , wherein the apex comprises a flat portion between the first curved surface and the second curved surface.