Knotless orthopedic stabilization system
Embodiments of knotless button-suture assemblies for orthopedic stabilization are disclosed. The button-suture assembly includes a button having a first opening, a second opening and a center opening. The assembly further includes a tensioning member having two tensioning member ends exiting from the first opening and the second opening of the button and disposed in the proximal direction. The assembly further includes a locking pin mated with the button through the center opening of the button in such a manner that allows a proximal movement of the tensioning member when a pulling force is applied to the tensioning member ends towards a proximal direction and prevents a distal move-ment of the tensioning member when the pulling force applied to the loose ends of the tensioning member ceases to exist.
1. An orthopedic stabilization device comprising:
a suspension device comprising a button and a locking pin, the button having a central opening, first and second lateral openings positioned on opposite sides of the central opening, and a receiving surface configured to mate with the locking pin, the locking pin having a proximal end, a distal end, a distal member, and a mating surface configured to mate with the receiving surface of the button, the locking pin configured to mate with the button such that the distal member extends through the central opening in the button;
a tensioning member having a first tensioning member end passing through the first lateral opening and a second tensioning member end passing through the second lateral opening, the first and second tensioning member ends disposed outwardly towards a proximal direction of the button; and
an anchor configured for insertion into bone, the anchor having an outer surface configured for purchase in bone and a center opening;
wherein the tensioning member forms one or more tensioning member loops by passing through a transverse opening in the distal member of the locking pin and the center opening of the anchor; and
wherein the first and second tensioning member ends pass through the first and second lateral openings, respectively, immediately before passing between the receiving surface of the button and the mating surface of the locking pin.
2. The orthopedic stabilization device of claim 1 , wherein mating surface of the locking pin further comprises two indentations located on the proximal end of the locking pin and configured for positioning proximate the first lateral opening and the second lateral opening respectively to create two corresponding passages between the mating surface of the locking pin and of the receiving surface of the button for the tensioning member to pass through.
3. The orthopedic stabilization device of claim 2 , wherein the passages allow a proximal movement of tensioning member when a pulling force is applied to the tensioning member ends towards the proximal direction.
4. The orthopedic stabilization device of claim 3 , wherein the passages prevent distal movement of tensioning member when the pulling force ceases to exist subsequent to the applying of the pulling force to the tensioning member ends.
5. The orthopedic stabilization device of claim 1 , wherein the tensioning member corresponds to one of: a coreless suture, a suture with a jacket and a central core, and a tape.
6. The orthopedic stabilization device of claim 1 , wherein an inner circumference of the locking pin is threaded.
7. The orthopedic stabilization device of claim 1 , wherein the center opening comprises a hollow interior of the anchor.
8. The orthopedic stabilization device of claim 7 , wherein the at least one tensioning member loop is maintained inside the hollow interior.
9. The orthopedic stabilization device of claim 7 , wherein the anchor further comprises an interior horizontal connecting piece within the hollow interior.
10. The orthopedic stabilization device of claim 7 , wherein the at least one tensioning member loops passes over the interior horizontal connecting piece, and the interior horizontal connecting piece maintains the tensioning member loop inside the hollow interior.
11. The orthopedic stabilization device of claim 1 , wherein the anchor includes a pointed distal tip to assist with insertion of the anchor into bone.
12. The orthopedic stabilization device of claim 1 , wherein the anchor comprises a headless screw, and the center opening comprises a hollow interior of the anchor.