Low profile staple and methods for using the same
According to particular embodiments, the present staple includes a low-profile bridge and has the capacity for high sustained compression. In some embodiments, the staple includes a bridge with a continuous cross-section, and one or more pairs of legs with teeth cut therein, the inner legs and outer legs each including an angle of about 16 degrees.
1. A staple comprising:
a first leg connected to a bridge at a first shoulder; and
a second leg connected to the bridge at a second shoulder, wherein:
the bridge comprises a central bridge portion between a radial point of the first shoulder and a radial point of the second shoulder, the central bridge portion comprising:
a continuous cross-section comprising a continuously curved top edge;
a first edge and a second edge; and
a constant width that is greater than a thickness of the central bridge portion and a non-breaking surface between the first edge and the second edge.
2. The staple of claim 1 , wherein one or more of the first leg and the second leg comprises a proximal end and a distal end and each distal end includes a wedge-shaped tip.
3. The staple of claim 2 , wherein:
one or more of the first leg and the second leg comprises an inner surface and a plurality of teeth;
each of the plurality of teeth are cut out of a respective leg such that a point of each tooth lies in a plane; and
the inner surface of the respective leg lies in the plane.
4. The staple of claim 3 , wherein:
a length of the central bridge portion is at least 9 mm; and
a radius of the non-breaking surface of the bridge is at least 8 mm.
5. The staple of claim 4 , wherein the length of the central bridge portion is at least 13 mm.
6. The staple of claim 5 , wherein the constant width of the central bridge portion is approximately 3.0-7.5 mm.
7. The staple of claim 6 , wherein the thickness of the central bridge portion is approximately 0.5-2.9 mm.
8. The staple of claim 7 , wherein the first leg forms an angle of greater than approximately 16 degrees with the second leg in a relaxed position.
9. The staple of claim 8 , wherein the first leg is parallel with the second leg in a stressed position.
10. The staple of claim 9 , wherein strain is distributed evenly throughout the bridge in the stressed position.
11. The staple of claim 10 , wherein the staple comprises two legs.
12. The staple of claim 11 , wherein the staple comprises more than two legs.
13. The staple of claim 12 , wherein the staple comprises four legs.
14. The staple of claim 13 , wherein the staple comprises more than four legs.
15. The staple of claim 1 , wherein:
the continuously curved top edge comprises a first end opposite a second end; and
the continuous cross-section comprises:
a first side edge; and
a second side edge opposite the first side edge, wherein:
the continuously curved top edge transitions to a) the first side edge at the first end, and b) to the second side edge at the second end; and
the first side edge and the second side edge are orthogonal to a bottom edge of the continuous cross-section.
16. A method of using a surgical staple, the method comprising:
deforming a nitinol staple from a first position to a second position for inserting the nitinol staple into tissue of a patient, wherein:
the nitinol staple comprises:
a bridge comprising a central bridge portion between a radial point of a first inner shoulder and a radial point of a second inner shoulder, the central bridge portion comprising:
a continuous cross-section;
a first edge and a second edge; and
a constant width that is greater than a thickness of the central bridge portion and a non-breaking surface between the first edge and the second edge;
two or more inner legs integrally formed with the bridge, wherein a first inner leg of the two or more inner legs connects to the bridge at the first inner shoulder and a second inner leg of the two or more legs connects to the bridge at the second inner shoulder; and
two or more outer legs integrally formed with the bridge;
in the first position, each of the two or more inner legs forms an angle of greater than approximately 16 degrees with at least one other leg of the two or more inner legs;
in the second position, each of the two or more inner legs are parallel with the at least one other leg of the two or more inner legs and strain is distributed evenly throughout the bridge; and
the nitinol staple, when inserted into the tissue of the patient, exerts compressive force on the tissue of the patient.
17. The method of claim 16 , wherein:
one or more of the two or more inner legs comprises an inner surface and a plurality of teeth;
each of the plurality of teeth are cut out of a respective leg such that a point of each tooth lies in a plane; and
the inner surface of the respective leg lies in the plane.
18. The method of claim 17 , wherein:
a length of the central bridge portion is at least 9 mm; and
a radius of the non-breaking surface of the bridge is at least 8 mm.
19. The method of claim 18 , wherein the nitinol staple comprises four legs.
20. The method of claim 15 , wherein the bridge comprises two outer shoulders and each of the two or more outer legs connect to the bridge at one of the two outer shoulders.