Apparatus for connecting a longitudinal member to a bone portion
View Patent ↗An apparatus includes a fastener engageable with a bone portion to connect a longitudinal member to the bone portion. A housing has a first passage configured to receive the longitudinal member and a second passage extending transverse to the first passage. The fastener extends through an opening in the housing into the second passage. The second passage includes a plurality of frustoconical surfaces for engagement with the fastener.
1. An apparatus comprising:
a longitudinal member connectable with a bone portion;
a fastener having a longitudinal axis and engageable with the bone portion to connect said longitudinal member to the bone portion;
a housing having a first passage configured to receive said longitudinal member, said housing having a second passage with a longitudinal axis extending transverse to said first passage, said fastener extending through an opening in said housing into said second passage and being moveable relative to said housing, said second passage of said housing having at least first and second generally frustoconical surfaces for engagement with said fastener, said first and second generally frustoconical surfaces extending in the same direction with the first generally frustoconical surface being less inclined relative to the longitudinal axis of the second passage than the second generally frustoconical surface, said longitudinal axis of said fastener being positionable in any one of a plurality of angular positions relative to said longitudinal axis of said second passage;
a spacer received in said second passage of said housing and engageable with said fastener and said longitudinal member; and
a clamping mechanism configured to clamp said longitudinal member, said spacer and said housing to said fastener to prevent movement of said fastener relative to said housing.
2. The apparatus of claim 1 , wherein the fastener comprises a spherical surface engageable with one or more of the generally frustoconical surfaces of the second passage of the housing.
3. The apparatus of claim 1 , wherein the fastener extends from a distal end of the housing, the second generally frustoconical surface being nearer than the first generally frustoconical surface to the distal end of the housing.
4. The apparatus of claim 3 , wherein the first generally frustoconical surface is inclined at between about two degrees and fifteen degrees and the second generally frustoconical surface is inclined at between about fifteen degrees and thirty degrees relative to the longitudinal axis of the second passage of the housing.
5. The apparatus of claim 3 , wherein the first generally frustoconical surface is inclined at between about five degrees and thirty degrees and the second generally frustoconical surface is inclined at between about fifteen degrees and sixty degrees relative to the longitudinal axis of the second passage of the housing.
6. The apparatus of claim 3 , wherein the first generally frustoconical surface is inclined at between about ten degrees and forty-five degrees and the second generally frustoconical surface is inclined at between about twenty degrees and sixty degrees relative to the longitudinal axis of the second passage of the housing.
7. The apparatus of claim 1 , wherein the first generally frustoconical surface and the second generally frustoconical surface are separated by a transition surface.
8. The apparatus of claim 7 , wherein the transition surface is curvate.
9. The apparatus of claim 7 , wherein the transition surface comprises a groove.
10. The apparatus of claim 1 , wherein the second passage of the housing further comprises one or more cylindrical surfaces.
11. The apparatus of claim 10 , wherein the generally frustoconical surfaces are between two cylindrical surfaces of the second passage of the housing.
12. The apparatus of claim 11 , wherein the generally frustoconical surfaces are separated from the cylindrical surfaces by transition surfaces.
13. The apparatus of claim 1 , wherein the second passage of the housing further comprises a third generally frustoconical surface, the second generally frustoconical surface being less inclined than the third generally frustoconical surface relative to the longitudinal axis of the second passage of the housing.
14. The apparatus of claim 13 , wherein the fastener extends from a distal end of the housing, the third generally frustoconical surface being nearer than the second generally frustoconical surface to the distal end of the housing, the second generally frustoconical surface being nearer than the first generally frustoconical surface to the distal end of the housing.
15. The apparatus of claim 13 , wherein a transition surface is located between the second generally frustoconical surface and the third generally frustoconical surface.
16. The apparatus of claim 13 , wherein the second passage of the housing further comprises a fourth generally frustoconical surface and a fifth generally frustoconical surface, the third generally frustoconical surface being less inclined than the fourth generally frustoconical surface relative to the longitudinal axis of the second passage of the housing, the fourth generally frustoconical surface being less inclined than the fifth generally frustoconical surface relative to the longitudinal axis of the second passage of the housing.
17. The apparatus of claim 16 , wherein the fastener extends from a distal end of the housing, the fifth generally frustoconical surface being nearer than the fourth generally frustoconical surface to the distal end of the housing, the fourth generally frustoconical surface being nearer than the third generally frustoconical surface to the distal end of the housing, the third generally frustoconical surface being nearer than the second generally frustoconical surface to the distal end of the housing, the second generally frustoconical surface being nearer than the first generally frustoconical surface to the distal end of the housing.
18. An apparatus for connecting a longitudinal member with a bone portion, comprising:
a fastener having a longitudinal axis and engageable with a bone portion, the fastener having a spherical surface;
a housing having a passage, said fastener extending through an opening in said housing into said passage, said passage having at least two generally frustoconical surfaces, each configured to contact the spherical surface of said fastener.
19. The apparatus of claim 18 , wherein the fastener is movable in any one of a plurality of angular positions relative to the housing.
20. The apparatus of claim 18 , wherein the housing further comprises a channel for receiving the longitudinal member.
21. The apparatus of claim 20 , further comprising a clamping mechanism configured to clamp the longitudinal member to the fastener to prevent relative movement of the fastener relative to the longitudinal member.
22. The apparatus of claim 18 , further comprising a spacer received in said passage of said housing and engageable with said fastener and said longitudinal member.
23. The apparatus of claim 22 , further comprising a retaining member to retain said spacer and said fastener in said housing.