Modular socket prosthesis

• US 6,682,566 B2
• Filed: 07/30/2001
• Issued: 01/27/2004
• Est. Priority Date: 07/29/2000
• Status: Expired due to Fees

• Current Assignee: Thurgauer Kantonalbank
• Original Assignee: Klaus Draenert
• Inventors: Draenert, Klaus
• Primary Examiner(s): Lewis, Ralph A.
• Application Number:
  US09/919,177
• Publication Number:
  US 20020049500A1
• Time in Patent Office: 911 Days
• Field of Search: 623/22.21, 623/22.24, 623/22.25, 623/22.28, 606/91
• US Class Current: 623/22.24
• CPC Class Codes: A61F 2/34 Acetabular cups
• CPC Class Codes: A61F 2/4603 for insertion or extraction of endoprosthetic joints or of accessories thereof
• CPC Class Codes: A61F 2/4609 of acetabular cups
• CPC Class Codes: A61F 2/4684 Trial or dummy prostheses
• CPC Class Codes: A61F 2002/30014 differing in elasticity, stiffness or compressibility
• CPC Class Codes: A61F 2002/30324 differing in thickness
• CPC Class Codes: A61F 2002/30332 Conically- or frustoconically-shaped protrusion and recess
• CPC Class Codes: A61F 2002/3054 about a connection axis or implantation axis for selecting any one of a plurality of radial orientations between two modular parts, e.g. Morse taper connections, at discrete positions, angular positions or continuous positions
• CPC Class Codes: A61F 2002/30563 having elastic means or damping means, different from springs, e.g. including an elastomeric core or shock absorbers
• CPC Class Codes: A61F 2002/3071 Identification means; Administration of patients
• CPC Class Codes: A61F 2002/30787 inclined obliquely with respect to each other
• CPC Class Codes: A61F 2002/3233 having anti-luxation means for preventing complete dislocation of the femoral head from the acetabular cup
• CPC Class Codes: A61F 2002/3401 with radial apertures, e.g. radial bores for receiving fixation screws
• CPC Class Codes: A61F 2002/3403 Polar aperture
• CPC Class Codes: A61F 2002/3429 with an integral peripheral collar or flange, e.g. oriented away from the shell centre line
• CPC Class Codes: A61F 2002/3456 ellipsoidal or having a flattened polar region
• CPC Class Codes: A61F 2002/3459 made of different partially-spherical portions
• CPC Class Codes: A61F 2002/3469 with non-radial inner bores or canals
• CPC Class Codes: A61F 2002/4681 by applying mechanical shocks, e.g. by hammering
• 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 2250/0018 : differing in elasticity, stiffness or compressibility
• CPC Class Codes: A61F 2250/0036 : differing in thickness
• CPC Class Codes: A61F 2250/0087 : colour-coded
• CPC Class Codes: A61F 2310/00017 : Iron- or Fe-based alloys, e.g. stainless steel
• CPC Class Codes: A61F 2310/00023 : Titanium or titanium-based alloys, e.g. Ti-Ni alloys
• CPC Class Codes: A61F 2310/00029 : Cobalt-based alloys, e.g. Co-Cr alloys or Vitallium
• CPC Class Codes: A61F 2310/00131 : Tantalum or Ta-based alloys
• CPC Class Codes: A61F 2310/00179 : Ceramics or ceramic-like structures

Abstract

The present invention essentially relates to a hip joint socket system for a “press-fit” anchorage in the bony acetabulum that allows the inserts that articulate with the artificial head to be connected securely, and, using said inserts, also allows the center of the rotation of the socket to be reconstructed, the risk of luxation to be eliminated, and the plane of load application to be varied across an infinite range of positions within a defined angular range.

Claims

1. An artificial hip socket comprising:

an outer shell adapted to be fitted in a patient'"'"'s pelvis, the outer shell having a conical interior surface defining an interior cavity, and a rim that surrounds the interior cavity;

an insert module that can be fitted in the outer shell, the insert module having a conical exterior surface that matches the conical interior surface of the outer shell, the insert module having a collar that extends over the rim of the outer shell when the insert module is fitted in the outer shell; and

an articulating insert that is separate from the insert module and can be fitted in the insert module, the articulating insert having an interior cavity for receiving a femur head.

2. An artificial hip socket according to claim 1, wherein the outer shell defines an interior cavity that is bounded by said conical interior surface and by a flattened dome.

3. An artificial hip socket according to claim 1, wherein the cone angle of said conical interior surface is between 3°

and 15°

.

4. An artificial hip socket according to claim 1, wherein the outer shell is made of titanium, a titanium alloy, tantalum, a tantalum alloy, a CoCroMo alloy, or stainless steel, the insert module is made of the same material as the outer shell and the articulating insert is made of ceramic or plastic.

5. An artificial hip socket according to claim 1, further comprising a trial insert that can be fitted into and removed from the outer shell.

6. An artificial hip socket according to claim 1, wherein the outer shell includes a formation for attaching the outer shell to a setting instrument for anchoring the shell in a patient'"'"'s pelvis.

7. An artificial hip socket according to claim 1, wherein the outer shell has a peripheral wall formed with passages that permit elastic deformation of the outer shell.

8. An artificial hip socket comprising:

an outer shell adapted to be fitted in a patient'"'"'s pelvis, the outer shell having a conical interior surface;

an insert module that can be fitted in the outer shell, the insert module having a conical exterior surface that matches the conical interior surface of the outer shell, the insert module having a conical interior surface, and

an articulating insert that is separate from the insert module and can be fitted in the insert module, the articulating insert having a conical exterior surface that matches the conical interior surface of the insert module, and the articulating insert having an interior cavity for receiving a femur head.

9. An artificial hip socket comprising:

an outer shell adapted to be fitted in a patient'"'"'s pelvis, the outer shell having a conical interior surface,

an insert module that can be fitted in the outer shell, the insert module having a conical exterior surface that matches the conical interior surface of the outer shell, and

an articulating insert fitted in the insert module, the articulating insert having an interior cavity for receiving a femur head and being made of a different material from the insert module, wherein the insert module has a conical interior surface and the articulating insert has a conical exterior surface that matches the conical interior surface of the insert module.

10. An artificial hip socket according to claim 9, wherein the outer shell is made of titanium, a titanium alloy, tantalum, a tantalum alloy, a CoCrMo alloy, or stainless steel, the insert module is made of the same material as the outer shell and the articulating insert is made of ceramic or plastic.

11. An artificial hip socket according to claim 9, wherein the outer shell has a peripheral wall formed with passages that permit elastic deformation of the outer shell.

12. A method of assembling an artificial hip socket, comprising:

a) providing an outer shell adapted to be fitted in the patient'"'"'s pelvis, the outer shell having a conical interior surface,

b) fitting a trial insert in the outer shell and subsequently removing the trial insert,

c) fitting an insert module in the outer shell, the insert module having a conical exterior surface that matches the conical interior surface of the outer shell, and

d) fitting an articulating insert in the insert module, the articulating insert having an interior cavity for receiving a femur head.