Bone plate and retractor assembly

• US 20020133157A1
• Filed: 03/14/2001
• Published: 09/19/2002
• Est. Priority Date: 03/14/2001
• Status: Active Grant

• Current Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Electro-Biology Incorporated (Zimmer Biomet Holdings, Inc.)
• Inventors: Bailey, Kirk J., Rousseau, Patrick, Sterett, William
• Granted Patent: US 6,565,570 B2
• Time in Patent Office: Days
• US Class Current: 606/69
• CPC Class Codes: A61B 17/025 Joint distractors
• CPC Class Codes: A61B 17/8095 Wedge osteotomy devices

Abstract

A system for performing osteotomies includes a bone plate and a retractor assembly. The bone plate generally includes a first mounting portion for attachment to a first bone portion, a second mounting portion for attachment to a second bone portion, and an intermediate portion connecting the first mounting portion and the second mounting portion. The retractor assembly includes first and second handle members coupled for relative movement about a first pivot axis and first and second jaw members coupled to the first and second handle members, respectively.

Claims

1. A bone plate for securing the relative positions between first and second portions of a bone separated by a gap, the bone plate comprising:

a first mounting portion for attachment to the first bone portion;

a second mounting portion for attachment to the second bone portion; and

an intermediate portion connecting the first mounting portion and the second mounting portion in a first direction, the intermediate portion having a reduced cross-sectional dimension.

2. The bone plate for securing the relative positions between first and second portions of a bone separated by a gap of claim 1, wherein the intermediate portion has a central portion with a width in a second direction perpendicular to the first direction that is substantially less than a width of a first end of the intermediate portion a width of a second end of the intermediate portion.

3. The bone plate for securing the relative positions between first and second portions of a bone separated by a gap of claim 1, wherein the first and second mounting portions both include a plurality of mounting apertures.

4. The bone plate for securing the relative positions between first and second portions of a bone separated by a gap of claim 3, wherein each of the mounting apertures includes a center spaced from a line coincident with a centerline of the intermediate portion.

5. The bone plate for securing the relative positions between first and second portions of a bone separated by a gap of claim 1, wherein the bone plate is curved in the second direction perpendicular to the first direction.

6. The bone plate for securing the relative positions between first and second portions of a bone separated by a gap of claim 1, wherein the intermediate portion includes first and second shelves extending from a rear surface of the bone plate.

7. The bone plate for securing the relative positions between first and second portions of a bone separated by a gap of claim 1, wherein the first and second shelves are disposed immediately adjacent first and second ends of the intermediate portion, respectively.

8. The bone plate for securing the relative positions between first and second portions of a bone separated by a gap of claim 7, wherein one of the first and second mounting portions includes first and second mounting apertures spaced apart from one another in both the first direction and the second direction.

9. A retractor assembly for establishing a wedge-shaped gap between first and second portions of a bone, the retractor assembly comprising:

a first handle member;

a second handle member coupled to the first handle member for relative movement about a first pivot axis;

a first jaw member having a first end coupled to a first end of the first handle member;

a second jaw member having a first end coupled to a first end of the second handle member, the second jaw member including a second end pivotably coupled to a second end of the second jaw member for relative movement about a second pivot axis.

10. The retractor assembly for establishing a wedge-shaped gap between first and second portions of a bone of claim 9, wherein the second pivot axis is generally perpendicular to the first pivot axis.

11. The retractor assembly for establishing a wedge-shaped gap between first and second portions of a bone of claim 9, wherein the first and second jaws are coupled for relative movement between first and second positions, the first and second jaw members being generally in a common plane in the first position.

12. The retractor assembly for establishing a wedge-shaped gap between first and second portions of a bone of claim 9, further comprising a coupling member attached to a second end of the first handle member and releasably engageable with a second end of the second handle member, the coupling member operative to maintain a desired angular orientation between the first and second jaw members.

13. The retractor assembly for establishing a wedge-shaped gap between first and second portions of a bone of claim 12, wherein the coupling member includes indicia indicative of a size of the gap when the first and second jaws are fully inserted into a cut between the first and second bone portions.

14. The retractor assembly for establishing a wedge-shaped gap between first and second portions of a bone of claim 9, further comprising a biasing arrangement coupled to the first and second handle members and operative for biasing the first and second jaw members to the first position.

16. The bone plate for securing the relative positions between first and second portions of a bone separated by a gap of claim 15, wherein the intermediate portion includes upper and lower surfaces defining the first and second rearwardly extending shelves, respectively.

17. The bone plate for securing the relative positions between first and second portions of a bone separated by a gap of claim 15, wherein the intermediate portion includes a central section having a reduced horizontal cross-sectional dimension.

18. The bone plate for securing the relative positions between first and second portions of a bone separated by a gap of claim 17, wherein the central section and the first and second rearwardly extending shelves cooperate to define an I-beam shape.

19. The bone plate for securing the relative positions between first and second portions of a bone separated by a gap of claim 15, wherein the slope is an anterior slope.

15. A bone plate for securing the relative positions between first and second portions of a bone separated by a gap, the bone plate comprising:

a first mounting portion for attachment to the first bone portion;

a second mounting portion for attachment to the second bone portion; and

an intermediate portion connecting the first mounting portion and the second mounting portion, the intermediate portion including first and second rearwardly extending shelves for extending into the gap and engaging the first and second portions of the bone, respectively, the first and second rearwardly extending shelves having a slope.

20. A bone plate for securing the relative positions between first and second portions of a bone separated by a gap, the bone plate comprising:

a first mounting portion for attachment to the first bone portion, the first mounting portion including first and second mounting holes;

a second mounting portion for attachment to the second bone portion, the second mounting portion including third and fourth mounting holes; and

an intermediate portion connecting the first mounting portion and the second mounting portion in a first direction, wherein the first and second mounting holes are spaced first and second distances from a longitudinally extending centerline, respectively, and the third and fourth mounting holes are spaced third and fourth distances from the centerline, the first and second distances being greater than the third and fourth distances.

21. The bone plate for securing the relative positions between first and second portions of a bone separated by a gap of claim 20, wherein the bone plate is curved in the second direction perpendicular to the first direction.