Adjustable surgical support base with integral hinge

• US 7,520,880 B2
• Filed: 01/09/2006
• Issued: 04/21/2009
• Est. Priority Date: 01/09/2006
• Status: Active Grant

• Current Assignee: Zimmer Technology Incorporated (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Zimmer Technology Incorporated (Zimmer Biomet Holdings, Inc.)
• Inventors: Foreman, Matthew, Claypool, Jody L., Rangaiah, Chetan
• Primary Examiner(s): Robert; Eduardo C
• Assistant Examiner(s): HAMMOND, ELLEN CHRISTINA
• Application Number:
  US11/328,011
• Publication Number:
  US 20070173849A1
• Time in Patent Office: 1,198 Days
• Field of Search: 606/87, 606/88, 606/86.R, 162/25, 162/31, 162/32, 162/46, 162/55
• US Class Current: 606/88
• CPC Class Codes: A61B 17/155 Cutting femur
• CPC Class Codes: A61B 17/157 Cutting tibia

Abstract

An apparatus is provided for supporting a surgical component adjacent to a bone during a surgical procedure. The apparatus includes an integral body having a hinge platform, a hinge integral with the hinge platform; and a surgical component mounting portion integral with the hinge for rotation generally about a hinge axis relative to the hinge platform. An adjustment mechanism is operably connected between the hinge platform and the surgical component mounting portion to allow selective incremental rotation of the surgical component mounting portion relative to the hinge platform.

Claims

1. An apparatus for supporting a surgical component adjacent to a bone during a surgical procedure, the apparatus comprising:

an integral body comprising;

a hinge platform;

a first living hinge integral with the hinge platform;

a surgical component mounting portion integral with the first hinge for rotation generally about a first axis relative to the hinge platform; and

a first adjustment mechanism operably connected between the hinge platform and the surgical component mounting portion to allow selective incremental rotation of the surgical component mounting portion relative to the hinge platform.

2. The apparatus of claim 1 wherein the integral body is formed as a single unitary component.

3. The apparatus of claim 2 wherein the integral body comprises an integrally molded plastic body.

4. The apparatus of claim 1 wherein the integral body is penetrable by x-rays and compatible with magnetic resonance imaging.

5. The apparatus of claim 1 wherein the first hinge comprises a cantilevered wall having a first end and a second end, the wall arising from the hinge platform at the first end and the wall supporting the surgical component mounting portion at the second end.

6. The apparatus of claim 5 wherein the wall further comprises a narrowed portion between the first and second ends, the first hinge bending at the narrowed portion.

7. The apparatus of claim 6 wherein the narrowed portion is defined by opposing radii formed on opposite sides of the wall.

8. The apparatus of claim 1 wherein the first adjustment mechanism comprises an adjustment screw threadably mounted to the hinge platform, the adjustment screw having an end contacting the surgical component mounting portion such that rotating the adjustment screw causes the surgical component mounting portion to rotate about the first hinge.

9. The apparatus of claim 8 wherein the first hinge is resiliently biased against the adjustment screw.

10. The apparatus of claim 8 further comprising an adjustment screw support projecting from the hinge platform, the adjustment screw support defining an adjustment bore having an adjustment axis spaced away from the hinge axis a moment arm distance, the adjustment screw threadably engaging the adjustment bore for translation along the adjustment axis.

11. The apparatus of claim 8 wherein the adjustment screw engages the surgical component mounting portion in bi-directional axial force transmitting relationship.

12. The apparatus of claim 11 wherein the end of the adjustment screw includes a hemispherical ball tip and the surgical component mounting portion defines a hemispherical groove, the ball tip engaging the hemispherical groove for bi-directional axial force transmission.

13. The apparatus of claim 8 wherein the integral body and screw both comprise molded plastic.

14. The apparatus of claim 1 further comprising a second hinge integral with the body, the second hinge supporting rotation generally about a second axis.

15. The apparatus of claim 14 wherein the first axis and second axis are perpendicular to one another.

16. The apparatus of claim 15 further comprising a mounting base and a translational adjustment mechanism operably connected between the mounting base and the integral body, the translational adjustment mechanism being operable to translate the integral body relative to the mounting base.

17. The apparatus of claim 16 wherein the mounting base includes a fixation mechanism operable to secure the mounting base to the bone.

18. The apparatus of claim 16 wherein the translational adjustment mechanism comprises a slide slip-fit within a slot and a screw jack operable to translate the slide within the slot.

19. The apparatus of claim 1 further comprising a cut guide mounted to the surgical component mounting portion.

20. An apparatus for supporting a cut guide adjacent to the knee joint during knee joint replacement surgery, the knee joint comprising a tibia and a femur and having a medial/lateral axis, an anterior/posterior axis, and a proximal/distal axis, rotation about the medial/lateral axis corresponding to extension plane rotation, and rotation about the anterior/posterior axis corresponding to varus/valgus rotation, the apparatus comprising:

a mounting base mountable to a bone;

an integral body mounted to the mounting base, the integral body comprising;

a first living hinge generally defining a first hinge axis;

a surgical component mounting portion integral with the first hinge for rotation generally about the first hinge axis relative to the mounting base;

a second hinge integral with the first hinge, the second hinge generally defining a second hinge axis oriented generally transverse to the first hinge axis, the surgical component mounting portion being rotatable generally about the second hinge axis relative to the mounting base;

a first rotational adjustment mechanism operably connected to the integral body, the first rotational adjustment mechanism being operable to effect selective incremental rotation of the surgical component mounting portion about the first hinge axis relative to the mounting base;

a second rotational adjustment mechanism operably connected to the integral body, the second rotational adjustment mechanism being operable to effect selective incremental rotation of the surgical component mounting portion about the second hinge axis relative to the mounting base; and

a cut guide mounted to the surgical component mounting portion, the cut guide defining a cut plane.

21. The apparatus of claim 20 further comprising a translational adjustment mechanism operably connected between the integral body and the mounting base, the translational adjustment mechanism being operable to effect selective incremental translation of the integral body relative to the mounting base along a translation axis, the translation axis being oriented generally transverse to both the first and second hinge axes.

22. The apparatus of claim 21 wherein the mounting base is mountable on a bone relative to the knee joint to simultaneously align the first rotational axis parallel to the medial/lateral axis of the knee, the second rotational axis parallel to the anterior/posterior axis of the knee, and the translation axis parallel to the proximal/distal axis of the knee such that operating the first rotational adjustment mechanism moves the cut plane in extension plane rotation, operating the second rotational adjustment mechanism moves the cut plane in varus/valgus rotation, and operating the translation adjustment mechanism translates the cut plane parallel to the proximal/distal axis.