Set For Creating An Offset-Resurfacing Hip-Joint Implant

• US 20090018666A1
• Filed: 07/09/2008
• Published: 01/15/2009
• Est. Priority Date: 07/09/2007
• Status: Active Grant

• Current Assignee: Orthodynamics GmbH
• Original Assignee: Eska Implants GmbH & Co. KG.
• Inventors: Gerdesmeyer, Ludger, Grundei, Hans
• Granted Patent: US 7,628,820 B2
• Time in Patent Office: Days
• US Class Current: 623/22.210
• CPC Class Codes: A61F 2/32 for the hip
• CPC Class Codes: A61F 2/34 Acetabular cups
• CPC Class Codes: A61F 2/3603 implanted without ablation of the whole natural femoral head endoprosthetic cartilage A61F2/30756
• CPC Class Codes: A61F 2/4684 Trial or dummy prostheses
• CPC Class Codes: A61F 2002/30324 differing in thickness
• CPC Class Codes: A61F 2002/30326 differing in height or in length
• CPC Class Codes: A61F 2002/30331 made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2002/30593 hollow
• CPC Class Codes: A61F 2002/30841 Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
• CPC Class Codes: A61F 2002/30892 parallel
• CPC Class Codes: A61F 2002/3403 Polar aperture
• CPC Class Codes: A61F 2002/3414 Polar protrusion, e.g. for centering two concentric shells
• 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 2250/0036 differing in thickness
• CPC Class Codes: A61F 2250/0037 differing in height or in length
• CPC Class Codes: A61F 2310/00011 Metals or alloys

Abstract

A set is provided for creating an offset-resurfacing hip-joint implant. The set includes a 1 to 1.5 mm thick metallic acetabulum shell (1) for insertion into the natural acetabulum, from which only cartilage has been removed, a metallic head cap (2) for placement on the natural hip-joint head, from which only cartilage has been removed, and an inlay (3) for insertion into the acetabulum shell (1) as a sliding partner for the head cap (2). The inlay has a material thickness of 2 to 5 mm. The head cap (2) has a wall thickness which increases constantly from a thickness of 2 mm to 6 mm viewed in cross section in the region of the base edge (6) of the head cap, so that an eccentricity is produced in its outer shape

Claims

1. A set for creating an offset-resurfacing hip-joint implant, the set comprising a 1 to 1.5 mm thick metallic acetabulum shell (1) shaped for insertion into a natural acetabulum, from which acetabulum only cartilage has been removed, a metallic hip-joint head cap (2) shaped for placement on a natural hip-joint head, from which head only cartilage has been removed, wherein the head cap (2) has a wall which increases constantly from a thickness of 2 mm to 6 mm viewed in cross section in a region of a base edge (6) of the head cap, such that an eccentricity is produced in an outer shape of the head cap, and an inlay (3) shaped for insertion into the acetabulum shell (1) as a sliding partner for the head cap (2), the inlay having a material thickness of 2 to 5 mm.

2. The set according to claim 1, further comprising a guiding pin (7) connected to the head cap proximally and in an exact center in a pole region of the head cap (2).

3. The set according to claim 1, further comprising at least two anti-rotation elements (8) projecting into an interior of the head cap (2).

4. The set according to claim 3, wherein the anti-rotation elements (8) have a shield-shaped construction.

5. The set according to claim 3, wherein the anti-rotation elements (8) have a pin-shaped construction.

6. The set according to claim 2, further comprising at least two anti-rotation elements (8) projecting into an interior of the head cap (2).

7. The set according to claim 6, wherein the anti-rotation elements (8) have a shield-shaped construction.

8. The set according to claim 6, wherein the anti-rotation elements (8) have a pin-shaped construction.