Wedge apparatus for use in operating on a bone
View Patent ↗The relationship between first and second portions of a bone in a patient's body is changed by moving a wedge member into a slot formed in the bone. Force is applied against hard cortical bone by the wedge member. This force pivots the first portion of the bone relative to the second portion of the bone about an axis extending through bone interconnecting the first and second portions of the bone. As the wedge member moves into the bone, a side surface of the wedge member is moved into alignment with an outer side surface of the bone. The wedge member is fixedly connected with the bone. The wedge member is rigid so that the bone can immediately be load bearing. One or more openings may be provided in the wedge member to enable bone to grow through the wedge member. The wedge member may contain a material which promotes growth of bone through the wedge member.
1. An implantable device for maintaining a spatial relationship between first and second bone surfaces, the device comprising:
a support body configured to be positioned into at least a portion of a space located between the first and second bone surfaces, the support body includes a longitudinal central axis, an upper surface, a lower surface, a trailing end, a first side, a second side and a leading end, the upper surface defining an upper plane, the leading end extending generally linearly between a first end and a second end, a recess extending into the support body from the trailing end proximate the longitudinal central axis; and
a mounting strip including an opening, a leading side and a trailing side, the opening aligned with the recess along longitudinal axes of the opening and the recess when the mounting strip is connected to the trailing end of the support body with the leading side facing the support body, the opening and the recess configured to receive a screw member such that a shank of the screw member extends through the upper plane when the shank is positioned in the recess, a countersink formed at least partially in the support body and configured to receive a head portion of the screw member such that the head portion is positioned between a trailing end plane defined by the trailing side of the mounting strip and the leading end when the screw member is received in the opening and the recess.
2. An implantable device as set forth in claim 1 wherein the mounting strip is in engagement with cortical bone when the support body is between the first and second bone portions and the support body is in engagement with cancellous bone when the support body is between the first and second bone surfaces.
3. An implantable device for maintaining a spatial relationship between first and second bone surfaces, the device comprising:
a support body including a longitudinal central axis, an upper surface, a lower surface, a trailing end, a first side, a second side and a leading end, the upper surface defining an upper plane, the leading end extending generally linearly between a first end and a second end, a horizontal body plane defined on the longitudinal central axis, a recess extending into the support body from the trailing end toward the leading end and located at least partially on the horizontal body plane, the support body constructed of a polymeric material; and
a mounting strip including an opening, a leading side and a trailing side, the opening aligned with the recess along longitudinal axes of the opening and the recess when the mounting strip is connected to the trailing end of the support body with the leading side facing the support body, the opening and the recess configured to receive a screw member such that a shank of the screw member extends through the upper plane when the shank is positioned in the recess, a countersink formed at least partially in the support body and configured to receive a head portion of the screw member such that the head portion is positioned between a trailing end plane defined by the trailing side of the mounting strip and the leading end when the screw member is received in the opening and the recess, the mounting strip constructed of a metallic material.
4. The implantable device as set forth in claim 1 , wherein the recess extends generally linearly from the trailing end to the upper surface.
5. The implantable device as set forth in claim 1 , wherein the recess extends generally linearly from the trailing end toward the upper surface.
6. The implantable device as set forth in claim 1 , wherein the support body includes a bone growth opening therethrough, the bone growth opening configured to enable bone to grow through the support body.
7. The implantable device as set forth in claim 6 , wherein the bone growth opening has a generally straight, cylindrical configuration.
8. The implantable device as set forth in claim 6 , wherein the bone growth opening is comprised of a plurality of bone growth openings.
9. The implantable device as set forth in claim 1 , wherein the support body has a generally frusta-circular shape when viewed toward the upper surface, the first side, the second side and the trailing end being arcuate.
10. The implantable device as set forth in claim 1 , wherein the mounting strip is comprised of a first mounting strip, a second mounting strip, and a third mounting strip.
11. The implantable device as set forth in claim 1 , wherein the support body has an open celled construction.
12. The implantable device as set forth in claim 1 , wherein the lower surface defines a lower plane, the upper plane tapers toward the lower plane from the trailing end toward the leading end.
13. The implantable device as set forth in claim 12 , wherein the upper plane and the lower plane define an acute angle, the acute angle being less than twenty degrees (20°).
14. The implantable device as set forth in claim 13 , wherein the acute angle is within a range between one and twenty degrees (1-20°).
15. The implantable device as set forth in claim 14 , wherein the acute angle is between two and ten degrees (2-10°).
16. The implantable device as set forth in claim 1 , wherein the support body is constructed of a material selected from the group consisting of human bone, animal bone, a metallic material, a stainless steel material, a tantalum material, a porous ceramic material and a polymeric material.
17. The implantable device as set forth in claim 1 , wherein the support body has the form of a portion of a circle with the leading end being a chord of the circle when viewed toward the top surface.
18. The implantable device as set forth in claim 1 , wherein the mounting strip is comprised of a metallic material and the support body is constructed of a polymeric material.
19. The implantable device as set forth in claim 1 , further comprising:
first and second fasteners, the mounting strip including an upper portion extending above the upper surface and a lower portion extending below the lower surface when the mounting strip is connected to the trailing end of the support body, the first fastener configured to extend through the upper portion and the second fastener configured to extend through the lower portion and into the bone to secure the mounting strip to the bone.
20. The implantable device as set forth in claim 3 , wherein the recess extends generally linearly from the trailing end toward the upper surface.
21. The implantable device as set forth in claim 3 , wherein the support body includes a bone growth opening therethrough, the bone growth opening configured to enable bone to grow through the support body.
22. The implantable device as set forth in claim 21 , wherein the bone growth opening has a generally straight, cylindrical configuration.
23. The implantable device as set forth in claim 21 , wherein the bone growth opening is comprised of a plurality of bone growth openings.
24. The implantable device as set forth in claim 3 , wherein the support body has a generally frusta-circular shape when viewed toward the upper surface, the first side, the second side and the trailing end being arcuate.
25. The implantable device as set forth in claim 3 , wherein the mounting strip is comprised of a first mounting strip, a second mounting strip, and a third mounting strip.
26. The implantable device as set forth in claim 3 , wherein the support body has an open celled construction.
27. The implantable device as set forth in claim 3 , wherein the lower surface defines a lower plane, the upper plane tapers toward the lower plane from the trailing end toward the leading end.
28. The implantable device as set forth in claim 27 , wherein the upper plane and the lower plane define an acute angle, the acute angle being less than twenty degrees (20°).
29. The implantable device as set forth in claim 28 , wherein the acute angle is within a range between one and twenty degrees (1-20°).
30. The implantable device as set forth in claim 29 , wherein the acute angle is between two and ten degrees (2-10°).
31. The implantable device as set forth in claim 3 , wherein the support body has the form of a portion of a circle with the leading end being a chord of the circle when viewed toward the top surface.
32. The implantable device as set forth in claim 3 , further comprising:
first and second fasteners, the mounting strip including an upper portion extending above the upper surface and a lower portion extending below the lower surface when the mounting strip is connected to the trailing end of the support body, the first fastener configured to extend through the upper portion and the second fastener configured to extend through the lower portion and into the bone to secure the mounting strip to the bone.