Modular socket prosthesis

• US 20020049500A1
• Filed: 07/30/2001
• Published: 04/25/2002
• Est. Priority Date: 07/29/2000
• Status: Active Grant

• Current Assignee: Thurgauer Kantonalbank
• Original Assignee: Klaus Draenert
• Inventors: Draenert, Klaus
• Granted Patent: US 6,682,566 B2
• Time in Patent Office: Days
• US Class Current: 623/22.12
• 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. Hip joint socket system to replace the natural hip socket comprising a shell and an insert module constructed such that said insert module accepts an insert that articulates with the artificial head, or is rigidly connected to it, constructed such that a margin, if it is present, does not prevent the descent of the cone (FIG. 01/80)

2. The hip joint socket system of claim (1), constructed such that a margin is formed that has a clearance angle that is located at the transition of the shell and insert module and that allows a conical insert module to descend in a conical seat on the shell (FIGS. 01/31 and 01/32).

3. The hip joint socket system of claims (1) and (2), designed such that the insert module can change the location of the center of rotation of the hip joint socket in various ways.

4. The hip joint socket system of claims (1) to (3), designed such that the insert module prevents luxation.

5. The hip joint socket system of claims (1) to (4), constructed such that the insert module can smoothly change the socket entry level within a specific angular range by means of rotation.

6. The hip joint socket system of claim (5), constructed such that the socket entry plane can be adjusted between 45 °

and 32 °

, preferably 38 °

.

7. The hip joint socket system of claims (1) to (6), constructed such that the outer shell is spherical with a flattened dome, and the mounting for the insert module has a conical design.

8. The hip joint socket system of claims (1) to (7), constructed such that the inclination of the cone (cone angle) is between 3 °

and 15 °

, preferably 7 °

, which corresponds, for example, to a slope of 39/35 for each 13 mm.

9. The hip joint socket system of claims (1) to (8), constructed such that the outer shell is made of titanium, a titanium alloy, tantalum, a tantalum alloy, a CoCrMo alloy, or of stainless steel, and the insert module is made of the same material, that it is configured in an essentially conical shape and accommodates an insert that articulates with the artificial head and is made of ceramic or plastic, or is rigidly attached to said head.

10. The hip joint socket system of claims (1) to (9), constructed such that the HDPE insert is inserted in a metal module or is rigidly attached to said metal module, which largely prevents the deformation of the plastic.

11. The hip joint socket system of claims (1) to (9), constructed such that a trial insert can be inserted into the spherical shell and can be easily removed.

12. The hip joint socket system of claims (1) to (11), constructed such that for each insert module there exists a corresponding 1- or 2-piece trial insert that can be used to perform a trial positioning and that is constructed in such a way that it can be removed easily.

13. A socket setting instrument (FIG. 04/200) for the atraumatic press-fit anchoring of a socket in the pelvis, comprising a central rod (FIG. 04/210) with an attachment means on its free end (FIG. 04/211) for the socket shell (FIG. 04.210) and a handle construction that is moveable relative to said central rod and has an end piece at the end (FIG. 04/220) that fits into the socket entry and that is rigidly attached by means of a handle (FIG. 04/222) to the hammer mallet impact point (FIG. 04/223).

14. The socket setting instrument of claim (13), constructed such that the central rod (FIG. 04/210) can be fixed in a smooth range of positions relative to the handle assembly (FIG. 04/220).

15. The socket setting instrument of claims (13) and (14), constructed such that the central rod (FIG. 04/210) is movable in the impact direction relative to the handle assembly (FIG. 04/220) with a spring-like action.

16. The socket setting instrument of claims (13) to (15) embodied such that the spring system of the central rod is constructed in such a way that the tensioning torque of the socket being inserted can be measured in a relative position and in a fixed position of the central rod relative to the handle construction.