Orthopedic compression/distraction device
View Patent ↗An orthopedic device for compressing or distracting bone parts includes an elongated body with two arms extending transversely away from the body. One arm is a stationary arm affixed to one end of the body and a second arm is a longitudinally movable. The two arms extend from the elongated body in the same direction and parallel to each other. The orthopedic device also includes a locking sleeve hingeably connected to the outer end of each of the first and second arms by a hinge joint, where each locking sleeve is configured for lockably receiving an elongated pin using a collet and a captured collet nut.
1. An orthopedic device comprising:
an elongated body having first and second ends;
a first arm member attached to and extending away from said first end and terminating at an outer end;
a second arm member extending from said elongated body and having a base portion and an outer end, wherein the base portion is configured and adapted to engage the elongated body and allow the second arm member to be longitudinally movable along said elongated body, said second arm member extending from the elongated body in the same direction as the first arm member; and
a locking sleeve hingeably connected to the outer end of each of the first and second arm members by a hinge joint, wherein said locking sleeve comprises an elongated shaft having an elongated pin receiving bore extending therethrough and a collet provided at one end of the elongated shaft, said collet comprising a plurality of collet arms provided with screw threads integrally formed on their exterior surfaces, and a collet nut that is threadably engaged to the collet for locking an elongated pin that is received in the elongated pin receiving bore.
2. The orthopedic device of claim 1 , wherein said screw threads on the exterior surfaces of the collet arms are interrupted with a hand of thread-tree zone and the collet nut is provided with one or more detents protruding into the band of thread-free zone and providing a mechanical interference that prevents the collet urn from being removed from the threaded engagement with the collet.
3. The orthopedic device of claim 2 , wherein said one or more detents are set screws that are threaded into the collet nut.
4. The orthopedic device of claim 1 , wherein each of said hinge joints having a hinge axis and said hinge axes are in axial alignment.
5. The orthopedic device of claim 4 , further wherein each of the locking, sleeves is connected to the hinge joint so that the elongated pin receiving bore is oriented transverse to the hinge axes.
6. The orthopedic device of claim 1 , wherein said collet nut is configured and adapted for accommodating a driver tool for turning the collet nut.
7. The orthopedic device of claim 6 , wherein said collet nut is provided with one or more recesses on its outer surface for accommodating a pin spanner wrench type driver tool.
8. The orthopedic device of claim 6 , wherein said collet nut is provided with a through hole for accommodating the elongated pin that is received in the elongated pin receiving bore and said through hole has an outline that is shaped to match the driver tool's driving feature.
9. A locking sleeve for lockably receiving an elongated pin, said sleeve comprising:
an elongated shaft having an elongated pin receiving bore extending therethrough;
a collet provided at one end of the elongated shaft, said collet comprising a plurality of collet arms provided with screw threads integrally formed on their exterior surfaces, wherein the collet arms are integrally formed at the end of the elongated shaft; and
a collet nut that is threadably engaged to the collet for locking an elongated pin that is received in the elongated pin receiving bore.
10. The locking sleeve of claim 9 , wherein said screw threads on the exterior surfaces of the collet arms are interrupted with a band of thread-free zone and the collet nut is provided with one or more detents protruding into the hand of thread-free zone and providing a mechanical interference that prevents the collet nut from being removed from the threaded engagement with the collet.
11. The locking sleeve, of claim 10 , wherein said one or more detents are set screws that are threaded into the collet nut.
12. The locking sleeve of claim 9 , wherein said collet nut is configured and adapted for accommodating a driver tool for turning the collet nut.
13. The locking sleeve of claim 12 , wherein said collet nut is provided with one or more recesses on its outer surface for accommodating a pin spanner wrench type driver tool.
14. The locking sleeve of claim 12 , wherein said collet nut is provided with a through hole for accommodating the elongated pin that is received in the elongated pin receiving bore and said through hole has an outline that is shaped to match the driver tool's driving feature.
15. The orthopedic device of claim 1 , wherein the collet arms are integrally formed at the end of the elongated shaft.
16. A device, comprising:
a locking sleeve including
an elongate shaft defining a pin receiving bore therethrough, the elongate shaft defining a plurality of slots extending longitudinally from a first end of the elongate shaft to a first position along a length of the elongate shaft to provide a plurality of collet arms, the plurality of collet arms including a first set of integrally formed screw threads on their exterior surfaces;
a collet nut configured to engage the first set of integrally formed screw threads to inwardly deflect the plurality of collet arms,
wherein the first set of integrally formed threads are disposed adjacent to the first end and at a distance from the first position.
17. The device of claim 16 , wherein the a second set of integrally formed screw threads along the length of the plurality of collet arms at a distance from the first set of integrally formed threads.
18. The device of claim 16 , wherein the collet nut includes an inner surface that is at least partially conical and is configured to engage a chamfered surface of each of the plurality of collet arms to facilitate compression of the plurality of collet arms.
19. The device of claim 16 , further comprising;
an elongated body having first and second ends;
a first arm member attached to and extending away from said first end of the elongated body and terminating at an outer end;
a second arm member extending from said elongated body of the elongated body and having a base portion and an outer end, wherein the base portion is configured and adapted to engage the elongated body and allow the second arm member to be longitudinally movable along said elongated body, said second arm member extending from the elongated body in the same direction as the first arm member.