Bone transport external fixation frame
Disclosed herein are systems and methods for manipulating the orientation of a plurality of bone fragments with respect to one another. A bone transport frame including first and second rings, a plurality of elongate struts, and a plurality of ring transport assemblies for orienting a first bone segment with respect to a second bone segment is disclosed. A third ring may be included in the bone transport frame for orienting a third bone segment with respect to the first and second bone segments. Manipulation of an adjustable member of the bone transport frame can transport a ring in either a proximal or distal direction with respect to other rings of the frame. Manipulation of another adjustable member of the bone transport frame can translate a central axis of one of the rings either toward or away from the central axes of the plurality of elongate struts.
1. A method of treating a bone of a patient, the method comprising:
coupling a proximal bone segment of the bone to a proximal ring of a fixation frame;
coupling a distal bone segment of the bone to a distal ring of the fixation frame;
coupling a medial bone segment of the bone to a medial ring of the fixation frame so that the medial ring is positioned between the proximal ring and the distal ring, the proximal and medial bone segment being separated by an osteotomy;
coupling a plurality of elongate struts to the proximal ring, the medial ring, and the distal ring; and
translating the medial ring toward the distal ring and away from the proximal ring to transport the medial bone segment toward the distal bone segment by elongating the medial bone segment.
2. The method of claim 1 , wherein each of the plurality of elongate struts includes a first adjustment mechanism.
3. The method of claim 2 , wherein translating the medial ring toward the distal ring includes actuating the first adjustment mechanisms.
4. The method of claim 3 , wherein the plurality of elongate struts are coupled to the medial ring via a corresponding plurality of ring transport assemblies.
5. The method of claim 4 , wherein each of the ring transport assemblies includes a second adjustable member.
6. The method of claim 5 , further comprising actuating at least one of the second adjustable members to translate the medial ring laterally.
7. The method of claim 4 , wherein actuating the first adjustment mechanisms translates the ring transport assemblies along corresponding ones of the plurality of elongate struts toward the distal ring.
8. The method of claim 7 , wherein the first adjustment mechanisms are positioned at proximal ends of corresponding ones of the plurality of elongate struts.
9. The method of claim 4 , wherein each of the ring transport assemblies includes a ball and socket joint.
10. The method of claim 4 , wherein each of the ring transport assemblies includes a ball jointed flange.
11. The method of claim 10 , wherein the ball jointed flange includes a hyperbolic collar.
12. The method of claim 11 , wherein a retaining pin extends into a through-hole of the medial ring and also into a through-hole of the ball jointed flange to couple the ring transport assembly to the medial ring.
13. The method of claim 11 , wherein each of the ring transport assemblies includes a locking nut.
14. The method of claim 13 , further comprising loosening one of the locking nuts so that the ball jointed flange is able to swivel relative to a corresponding one of the plurality of elongate struts.
15. The method of claim 14 , further comprising tightening the locking nut to lock the ball jointed flange in a current position.
16. The method of claim 3 , wherein actuating the first adjustment mechanisms includes incrementally rotating the first adjustment mechanisms so that the medial ring transports a fixed length toward the distal ring, each incremental rotation of the first adjustment mechanisms corresponding to a first fixed length.
17. The method of claim 1 , wherein of coupling the proximal bone segment to the proximal ring includes coupling a first end of a bone pin to the proximal bone segment and coupling a second end of the bone pin to a pin retention member, the pin retention member being coupled to the proximal ring.
18. The method of claim 1 , wherein coupling the proximal bone segment to the proximal ring comprises coupling a first end of a bone wire to the proximal bone segment and coupling a second end of the bone wire to a wire retention member, the wire retention member being coupled to the proximal ring.
19. The method of claim 1 , wherein the medial ring remains parallel to the proximal ring and the distal ring while translating the medial ring toward the distal ring.
20. The method of claim 1 , wherein the proximal ring remains parallel to the distal ring while translating the medial ring toward the distal ring, and the medial ring is parallel to neither the proximal ring nor the distal ring while translating the medial ring toward the distal ring.