Method and apparatus for bone fracture fixation
View Patent ↗Embodiments of the present invention provide a method and apparatus for fixing bone with an osteosynthesis splint. In embodiments of the present invention, a splint may be introduced into a bone at a fracture site, or may enter the rib at an opening near a fracture site and extend along the intramedullary canal across the fracture site.
1. An osteosynthesis splint for fixing a rib comprising:
a securing plate segment having a top surface that faces a first direction and an opposed bone securing surface to be placed against a bone, the bone securing surface spaced from the top surface in a second direction that is opposite the first direction;
a transition segment that extends from the securing plate, the transition segment having a proximal end that is coupled to the securing plate, and a distal end that is offset from the proximal end along the second direction;
an intramedullary segment elongate along a longitudinal direction, the intramedullary segment having a proximal segment that extends from the distal end of the transition segment, the intramedullary segment further having a distal segment that extends from the proximal segment such that the proximal segment is disposed between the distal segment and the transition segment, and the intramedullary segment having a top surface that faces the first direction and an opposed bottom surface that faces the second direction, wherein the bottom surface defines a concavity and is devoid of any portion that defines a convexity; and
a central axis that extends along the securing plate, the transition segment, and the intramedullary segment, the central axis lying in a plane that is defined by the first and second directions, and the longitudinal direction.
2. The osteosynthesis splint of claim 1 , wherein
the distal segment has a first uniform width and the proximal segment has a second uniform width, said first width being less than said second width, wherein the intramedullary segment defines a thickness extending between the top surface and the bottom surface of the intramedullary segment and measured in the first direction, and the second width is greater than the thickness.
3. The splint of claim 2 , wherein said transition segment is inclined upwardly from the intramedullary segment to the securing plate segment.
4. The splint of claim 2 , wherein the top surface of the securing plate segment defines a first plane, the bone securing surface defines a second plane, and no portion of the intramedullary segment intersects either of the first and second planes.
5. The splint of claim 2 , wherein said securing plate segment comprises one or more securing engagements for engaging one or more fasteners.
6. The splint of claim 2 , wherein said securing plate segment comprises a notch in one or both opposing lateral edges of said securing plate segment.
7. The splint of claim 2 , wherein said proximal segment comprises a substantially rectangular cross section.
8. The splint of claim 2 , wherein said proximal segment possesses a higher degree of vertical flexibility than lateral flexibility.
9. The splint of claim 2 , further comprising a plurality of securing engagements for engaging one or more fasteners, wherein said intramedullary segment is located distally of all securing engagements.
10. The splint of claim 2 , wherein the proximal segment has a width to thickness ratio of about 1.5:1 or greater.
11. The splint of claim 2 , wherein the distal segment has a width to thickness ratio that is less than the width to thickness ratio of the proximal segment.
12. The splint of claim 1 , wherein the transition segment comprises a concaved bottom surface portion.
13. The splint of claim 12 , wherein the top surface of the securing plate segment defines a first plane, the bone securing surface defines a second plane, and no portion of the intramedullary segment intersects either of the first and second planes.
14. The splint of claim 12 , wherein said bottom surface of said intramedullary segment defines a radius of curvature of about 5 to about 30 cm, and the radius of curvature is located at a point beneath said bottom surface.
15. The splint of claim 12 , wherein the securing plate segment comprises one or more securing engagements for engaging one or more fasteners.
16. The splint of claim 12 , wherein the securing plate segment comprises a notch in one or both opposing lateral edges of the securing plate segment.
17. The splint of claim 12 , wherein the proximal segment comprises a substantially rectangular cross section.
18. The splint of claim 12 , wherein the proximal segment possesses a higher degree of vertical flexibility than lateral flexibility.
19. The splint of claim 1 , further comprising a plurality of securing engagements for engaging one or more fasteners, wherein said intramedullary segment is located distally of all securing engagements.
20. The splint of claim 1 , wherein the proximal segment has a width to thickness ratio of about 1.5:1 or greater.
21. The splint of claim 1 , wherein the distal segment has a width to thickness ratio that is less than the width to thickness ratio of the proximal segment.
22. The splint of claim 1 , wherein the intramedullary segment has a length that extends from the transition segment to an end of the distal segment, wherein the bottom surface of the intramedullary segment extends along an entirety of the length and an entirety of the bottom surface is concave in shape.
23. An osteosynthesis splint configured to fix a rib, the splint comprising:
a securing plate segment having a top surface that faces a first direction and an opposed bone securing surface configured to be placed against a bone, the top surface defining a first plane and the bottom surface defining a second plane, the first direction being substantially normal to the first and second planes;
an intramedullary segment coupled to the securing plate segment such that no portion of the intramedullary segment intersects either of the first and second planes, the intramedullary segment having a distal segment, a proximal segment located proximally relative to the distal segment, and a length that extends from the proximal segment away from the securing plate segment and toward the distal segment, and the intramedullary segment having a top surface that faces in the first direction and an opposed bottom surface;
wherein when the intramedullary segment is in a neutral state: (1) at least a portion of the bottom surface is concave in shape along the length of the intramedullary segment; and (2) both the distal segment and the proximal segment are devoid of a first location on the top surface that is closer to the second plane than a second location on the top surface, the second location being located proximally relative to the first location.
24. The splint of claim 23 , wherein the bone securing surface is spaced from the top surface in a second direction that is opposite the first direction, and the splint further comprises a transition segment that extends from the securing plate, the transition segment having a proximal end that is coupled to the securing plate, and a distal end that is offset from the proximal end along the second direction, and the opposed bottom surface of the intramedullary segment faces the second direction and defines a concavity.
25. The splint of claim 24 , wherein the intramedullary segment is elongate along a longitudinal direction, the splint further comprising a central axis that extends along the securing plate, the transition segment, and the intramedullary segment, the central axis lying in a plane that is defined by the first and second directions, and the longitudinal direction.
26. The splint of claim 23 , wherein the intramedullary segment further comprises a tapered segment that extends between the proximal segment and the distal segment.