PROSTHETIC DEVICE AND SYSTEM FOR PREPARING A BONE TO RECEIVE A PROSTHETIC DEVICE

• US 20090149965A1
• Filed: 12/08/2008
• Published: 06/11/2009
• Est. Priority Date: 12/10/2007
• Status: Active Grant

• Current Assignee: MAKO Surgical Corporation (Stryker Corporation)
• Original Assignee: MAKO Surgical Corporation (Stryker Corporation)
• Inventors: Quaid, Arthur E.
• Granted Patent: US 8,361,163 B2
• Time in Patent Office: Days
• US Class Current: 623/22.400
• CPC Class Codes: A61B 17/1668 for the upper femur A61B17/164 takes precedence
• CPC Class Codes: A61B 17/175 for preparing the femur for hip prosthesis insertion
• CPC Class Codes: A61B 34/30 Surgical robots
• CPC Class Codes: A61F 2/30942 for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques
• CPC Class Codes: A61F 2/3603 implanted without ablation of the whole natural femoral head endoprosthetic cartilage A61F2/30756
• CPC Class Codes: A61F 2002/30125 elliptical or oval
• CPC Class Codes: A61F 2002/30593 hollow
• CPC Class Codes: A61F 2002/30769 madreporic
• CPC Class Codes: A61F 2002/308 oblong
• CPC Class Codes: A61F 2002/30817 Intersecting or overlapping blind bores
• CPC Class Codes: A61F 2002/30878 with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
• CPC Class Codes: A61F 2002/30891 Plurality of protrusions
• CPC Class Codes: A61F 2002/4631 the prosthesis being specially adapted for being cemented
• CPC Class Codes: A61F 2230/0008 elliptical or oval
• CPC Class Codes: A61F 2310/00011 Metals or alloys
• CPC Class Codes: A61F 2310/00179 Ceramics or ceramic-like structures
• CPC Class Codes: A61F 2310/00796 Coating or prosthesis-covering structure made of a phosphorus-containing compound, e.g. hydroxy(l)apatite

Abstract

A substantially cup-shaped prosthetic device for a joint is provided. The prosthetic device includes an outer surface configured to operatively engage at least one of a first bone of the joint and a component and an inner surface configured to connect to a second bone of the joint. The inner surface is rotationally asymmetric to minimize intrusion on a vascular region of the second bone.

Claims

1. A substantially cup-shaped prosthetic device for a joint, comprising:

an outer surface configured to operatively engage at least one of a first bone of the joint and a component; and

an inner surface configured to connect to a second bone of the joint,

wherein the inner surface is rotationally asymmetric to minimize intrusion on a vascular region of the second bone.

2. The substantially cup-shaped prosthetic device of claim 1, wherein the inner surface includes a bone-engaging first concave surface and a bone-engaging second concave surface, and a shape of the first concave surface is different from a shape of the second concave surface.

3. The substantially cup-shaped prosthetic device of claim 1, wherein a cross-section of the inner surface has a substantially elliptical shape.

4. The substantially cup-shaped prosthetic device of claim 1, wherein a cross-section of the inner surface includes an elliptical arc.

5. The substantially cup-shaped prosthetic device of claim 4, wherein the cross-section of the inner surface includes a circular arc.

6. The substantially cup-shaped prosthetic device of claim 1, wherein the inner surface includes a bone-engaging first concave surface and a bone-engaging second concave surface, and the first concave surface has a first radius and the second concave surface has a different, second radius.

7. The substantially cup-shaped prosthetic device of claim 6, wherein the first concave surface has a non-constant radius of curvature.

8. The substantially cup-shaped prosthetic device of claim 1, wherein the inner surface includes a bone-engaging first concave surface and a bone-engaging second concave surface, and a wall thickness at the first concave surface is less than a wall thickness at the second concave surface.

9. The substantially cup-shaped prosthetic device of claim 1, wherein a wall thickness of the prosthetic device is non-constant.

10. The substantially cup-shaped prosthetic device of claim 1, wherein the inner surface includes a bone-engaging first concave surface and a bone-engaging second concave surface, and the first concave surface is located on a portion of the inner surface that will abut the vascular region of the second bone.

11. The substantially cup-shaped prosthetic device of claim 1, wherein the prosthetic device is a femoral head cup.

12. A robotic system for preparing a bone of a joint to receive a substantially cup-shaped prosthetic device, the system comprising:

a controllable guide structure configured to guide cutting of the bone into a shape for receiving the substantially cup-shaped prosthetic device; and

a control system for controlling the guide structure, wherein the control system defines a bone-cutting pattern configured to minimize intrusion on a vascular region of the bone.

13. The robotic system of claim 12, wherein the control system includes at least one predefined bone cutting pattern configured to minimize intrusion on a vascular region of the bone.

14. The robotic system of claim 13, wherein the control system is configured to permit the at least one predefined bone cutting pattern to be modified based on the configuration of the bone to further minimize intrusion on the vascular region of the bone.

15. The robotic system of claim 12, wherein the bone-cutting pattern defines a rotationally asymmetric shape.

16. The robotic system of claim 12, wherein the control system includes at least one bone-cutting pattern for cutting a first convex surface in the bone and at least one bone-cutting pattern for cutting a second convex surface in the bone, where a shape of the first convex surface is different from a shape of the second convex surface.

17. The robotic system of claim 12, wherein the controllable guide structure is configured to guide cutting of the bone into a rotationally asymmetric shape.