Suture anchor with improved drive head
A suture anchor is provided including an elongate shank defining a longitudinal axis and having at least one bone-engaging thread formed thereon, and a drive head having a proximal end and a distal end mated to the elongate shank. The drive head has a substantially oval shape and includes at least one suture attachment member formed in a portion of the drive head. The configuration of the drive head is particularly advantages in that it provides a suture anchor having improved physical properties, including a high failure torque and a high stripping strength.
1. A suture anchor and installation kit, comprising:
at least one suture anchor having a longitudinal axis and a shank with bone-engaging threads formed thereon, and a proximal drive head having an oval shape formed on the shank, the drive head having at least a first suture tunnel and a second suture tunnel, each suture tunnel extending through the drive head such that each suture tunnel intersects the longitudinal axis, each suture tunnel is proximally offset from a distal end of the drive head, and each suture tunnel intersects the longitudinal axis at an angle to the other suture tunnel; and
a cylindrical driver tool having a distal end with a socket formed therein having an oval shape adapted to receive and engage the drive head of the suture anchor.
2. The kit of claim 1 , wherein the driver tool has an outer diameter that is equal to or less than an outer-most diameter of the suture anchor.
3. The kit of claim 1 , further comprising a longitudinally oriented suture-receiving channel formed in an outer surface of the drive head and extending from an opening of each suture tunnel.
4. The kit of claim 3 , wherein each suture-receiving channel extends through a proximal-most surface of the drive head and terminates at the opening to each suture tunnel.
5. The kit of claim 3 , wherein the drive head includes four longitudinally oriented suture-receiving channels formed therein.
6. The kit of claim 5 , wherein the drive head has a cross-sectional surface area at a proximal-most surface that represents about 72% of a nominal cross-sectional surface area within a perimeter of the drive head.
7. The kit of claim 1 , wherein the drive head has a failure torque of at least about 5.0 inch pounds.
8. The kit of claim 1 , wherein the at least one bone-engaging thread comprises a helical thread.
9. The kit of claim 1 , wherein the shank of the suture anchor tapers from a proximal end to a distal end.