FEMORAL HEAD CALCAR LOADING PROSTHESIS

• US 20080312746A1
• Filed: 06/15/2007
• Published: 12/18/2008
• Est. Priority Date: 06/15/2007
• Status: Active Grant

• Current Assignee: Concept, Design And Development, LLC
• Original Assignee: Anthony S. Unger
• Inventors: UNGER, Anthony S.
• Granted Patent: US 7,641,699 B2
• Time in Patent Office: Days
• US Class Current: 623/22.15
• CPC Class Codes: A61F 2/34 Acetabular cups
• CPC Class Codes: A61F 2/3601 for replacing only the epiphyseal or metaphyseal parts of the femur, e.g. endoprosthetic femoral heads or necks directly fixed to the natural femur by internal fixation devices non-prosthetic internal fixation devices for the femoral head or neck A61B17/74
• CPC Class Codes: A61F 2002/30125 elliptical or oval
• CPC Class Codes: A61F 2002/30153 rectangular
• CPC Class Codes: A61F 2002/30332 Conically- or frustoconically-shaped protrusion and recess
• CPC Class Codes: A61F 2002/30616 Sets comprising a plurality of prosthetic parts of different sizes or orientations
• CPC Class Codes: A61F 2002/3082 Grooves
• CPC Class Codes: A61F 2002/30879 Ribs
• CPC Class Codes: A61F 2002/3092 having an open-celled or open-pored structure
• CPC Class Codes: A61F 2002/365 Connections of heads to necks
• CPC Class Codes: A61F 2002/3652 Connections of necks to shafts
• CPC Class Codes: A61F 2002/4631 the prosthesis being specially adapted for being cemented
• CPC Class Codes: A61F 2220/0033 made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2230/0008 elliptical or oval
• CPC Class Codes: A61F 2230/0019 rectangular

Abstract

Provided is a novel hip replacement implant system that includes a ball assembly having a ball trunion, the ball assembly being configured as a replacement for the head of the femur and capable of being secured by the ball assembly trunion to a calcar implant element that can be securely seated in the calcar bone of the femoral neck, thus maintaining the load transfer function of the calcar bone of the femoral neck. A method of using the device is also provided.

Claims

1. A novel hip replacement implant system the system comprising:

a ball assembly having a ball with a securely connected and downwardly directed trunion;

a calcar implant element configured to be securely implanted into the calcar bone of the femoral neck of a subject,

wherein said calcar implant element is implanted in the upper portion of the femoral neck calcar bone so as to leave intact the load transferring calcar bone of the femur.

2. The system of claim 1, further comprising an acetabular component that is sized and configured to articulate with said ball, said acetabular component being capable of being securely attached to the hip socket of a subject.

3. The system of claim 1, wherein said ball is metal.

4. The system of claim 3, wherein said acetabular component is metal.

5. The system of claim 1, wherein said trunion has a first end and a second end and a centrally disposed trunion shaft, said trunion shaft having a Morse taper in the direction of each of said first end and said second end.

6. The system of claim 5, wherein said second end of said trunion is configured to be securely connected within a trunion receptacle defined in said calcar implant element.

7. The system of claim 5, wherein said first end of said trunion is configured to be securely connected within a trunion receptacle defined in an underside of said ball.

8. The system of claim 1, wherein said ball is selected from a group of ball manufactured from the group of materials consisting of titanium, steel, cobalt chromium alloys, ceramic, and layered metal and ceramic.

9. The system of claim 1, said calcar implant element comprising a porous coating.

18. A method of implanting the system of claim 1 in a subject in need thereof, the method comprising:

providing the system of claim 1;

resecting the head of the femur at a level immediately below the head;

providing a broach, said broach being sized and configured to machine into the calcar bone exposed in the femoral neck at the point where said head was resected;

using said broach to machine a receiving cavity in the most proximal portion of said calcar bone in said neck, said receiving cavity being sized and configured to have a generally wedge shape proceeding into said calcar bone and a generally oval shape cross-sectional configuration;

securely inserting a calcar implant element into said receiving cavity, said calcar implant element having a shape generally corresponding to the shape of said receiving cavity;

securely connecting said ball assembly to said calcar implant element.

19. The method of claim 18, further comprising securely inserting an acetabular component into the hip socket of the subject, whereby said ball assembly and said acetabular component are in a ball and socket joint functional relationship.

20. The method of claim 18, wherein said method is performed as minimally invasive.

21. The method of claim 20, wherein said method is arthroscopically performed.

22. A kit for implanting a hip replacement into a subject in need thereof;

the kit comprising;

at least one of the devices of claim 1;

at least one additional surgical tool or instrument.

23. The kit of claim 22, wherein two or more of the devices of claim are included, said devices being of different sizes relative one to the other.

24. The kit of claim 22, wherein said at least one additional surgical tool or instrument is a broach.

25. The kit of claim 22 wherein said at least one additional surgical tool or instrument is a trochar.

26. The kit of claim 22, further comprising sterile packaging whereby said kit can be opened directly in surgery prior to use.

10. A femoral head calcar loading prosthesis, comprising:

a ball assembly having a ball with a securely connected and downwardly directed trunion, said ball being configured to be capable of articulation with a natural acetabulum of a subject or with a manufactured acetabulum replacement;

a calcar implant element configured to be securely implanted into the calcar bone of the femoral neck of a subject,

wherein said calcar implant element is implanted in the upper portion of the femoral neck calcar bone so as to leave intact the load transferring calcar bone of the femur.

11. The prosthesis of claim 10, wherein said ball is metal.

12. The prosthesis of claim 10, wherein said acetabular component is manufactured and is configured to be capable of being implanted as an acetabulum replacement in the hip socket of a subject.

13. The prosthesis of claim 10, wherein said trunion has a first end and a second end and a centrally disposed trunion shaft, said trunion shaft having a Morse taper in the direction of each of said first end and said second end.

14. The prosthesis of claim 13, wherein said second end of said trunion is configured to be securely connected within a trunion receptacle defined in said calcar implant element.

15. The prosthesis of claim 13, wherein said first end of said trunion is configured to be securely connected within a trunion receptacle defined in an underside of said ball.

16. The prosthesis of claim 10, wherein said ball is selected from a group of ball manufactured from the group of materials consisting of titanium, steel, cobalt chromium alloys, ceramic, and layered metal and ceramic.

17. The prosthesis of claim 10, said calcar implant element comprising a porous coating.