IMPLANTABLE PROSTHESIS FOR REPLACING A HUMAN HIP OR KNEE JOINT AND THE ADJOINING BONE SECTIONS

• US 20120165950A1
• Filed: 12/22/2011
• Published: 06/28/2012
• Est. Priority Date: 12/23/2010
• Status: Active Grant

• Current Assignee: Rainer Baumgart
• Original Assignee: Rainer Baumgart
• Inventors: Baumgart, Rainer
• Granted Patent: US 8,778,029 B2
• Time in Patent Office: Days
• US Class Current: 623/22.4
• CPC Class Codes: A61F 2/3607 including proximal or total replacement of the femur
• CPC Class Codes: A61F 2/3859 Femoral components
• CPC Class Codes: A61F 2/4607 of hip femoral endoprostheses
• CPC Class Codes: A61F 2/482 Electrical means
• CPC Class Codes: A61F 2002/2825 Femur
• CPC Class Codes: A61F 2002/3055 for adjusting length
• CPC Class Codes: A61F 2002/30601 telescopic
• CPC Class Codes: A61F 2002/30607 Kits of prosthetic parts to be assembled in various combinations for forming different prostheses
• CPC Class Codes: A61F 2002/30668 Means for transferring electromagnetic energy to implants
• CPC Class Codes: A61F 2002/30672 temporary
• CPC Class Codes: A61F 2002/368 with lateral apertures, bores, holes or openings, e.g. for reducing the mass, for receiving fixation screws or for communicating with the inside of a hollow shaft
• CPC Class Codes: A61F 2002/4619 for extraction
• CPC Class Codes: A61F 2002/4629 connected to the endoprosthesis or implant via a threaded connection

Abstract

For replacing a human hip or knee joint and the adjoining bone sections, an implantable prosthesis is provided, comprising a joint replacement part (10), a shaft replacement part (12) and a rod-shaped shaft anchoring part (16) being insertable into an axial cavity (14) in the shaft replacement part (12).

Claims

1. An implantable prosthesis for replacing a human hip or knee joint and the adjoining bone sections, comprising:

a joint replacement part (10);

a shaft replacement part (12) being connectable to the joint replacement part (10) or integral therewith and having a central cavity (14); and

a rod-shaped shaft anchoring part (16) being insertable into the cavity (14) in the shaft replacement part (12);

wherein the rod-shaped shaft anchoring part (16) at a side facing away from the joint replacement part comprises;

locating means (28) for forming a channel (42) through a bone section (18) at the side facing away from the joint replacement part from outside, the channel (42) being axially aligned with the rod-shaped shaft anchoring part (16) and reaching up to the rod-shaped shaft anchoring part (16); and

attachment means (26) for engagement with a tool (44) located outside the bone section (18) through the channel (42) for exerting at least a traction force on the rod-shaped shaft anchoring part (16) for removing the rod-shaped shaft anchoring part (16) from the bone section (18) through the channel (42).

2. The implantable prosthesis according to claim 1, wherein the locating means (28) is a radiation source.

3. The implantable prosthesis according to claim 1, wherein the locating means (28) is a wire-shaped guide element protruding centrally from the attachment means (26), wherein the wire-shaped guide element passes through the bone section (18) and protrudes therefrom to the outside.

4. The implantable prosthesis according to claim 2, wherein the guide element (28) can be releasably connected to the attachment means (26).

5. The implantable prosthesis according to claim 1, wherein the shaft anchoring part (16) is formed such that a torque can be transmitted by the tool (44) to the rod-shaped shaft anchoring part (16).

6. The implantable prosthesis according to claim 1, wherein the attachment means (26) has an internally threaded bore (48).

7. The implantable prosthesis according to claim 6, wherein a polygonal socket (46) is provided in the rod-shaped shaft anchoring part (16) in front of the internally threaded bore (48) towards the tool.

8. The implantable prosthesis according to claim 1, wherein the rod-shaped shaft anchoring part (16) has a drill cutter (38) at the tool attachment side.

9. The implantable prosthesis according to claim 1, wherein a surface of the rod-shaped shaft anchoring part (16) has a surface roughness depth of 0.1 μ

m or less.

10. The implantable prosthesis according to claim 1, wherein an inner wall of the cavity (14) in the shaft replacement part (12) is designed to be slide friction reducing.

11. The implantable prosthesis according to claim 1, wherein the shaft replacement part (12), at an end facing away from the joint replacement part, has a lateral bore (37) opening into the cavity (14).

12. The implantable prosthesis according to claim 11, wherein a connection means (19) for fixing it to an adjoining bone section can be mounted at the shaft replacement part (12) in a region of the end facing away from the joint replacement part.

13. The implantable prosthesis according to claim 1, wherein the rod-shaped shaft anchoring part (16) over its length has an invariable diameter and/or a diameter tapered towards the joint replacement part (10).

14. The implantable prosthesis according to claim 1, wherein the rod-shaped shaft anchoring part (16) comprises a stabilizer or a medullary nail.