Glenoid prosthesis and a modular system with glenoid prostheses

• US 6,406,495 B1
• Filed: 12/15/1999
• Issued: 06/18/2002
• Est. Priority Date: 12/22/1998
• Status: Expired due to Term

• Current Assignee: Zimmer GmbH (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Sulzer Orthopedics Inc. (Centerpulse Orthopedics Incorporated)
• Inventors: Schoch, Roland
• Primary Examiner(s): WEHNER, CARY ELLEN
• Application Number:
  US09/464,329
• Time in Patent Office: 916 Days
• Field of Search: 623/19.11, 623/19.12, 623/19.13, 623/18.11, 623/18.12, 623/19.14, 623/22.32, 623/22.34, 623/22.35, 623/22.37, 623/22.38
• US Class Current: 623/19.13
• CPC Class Codes: A61F 2/30749 Fixation appliances for connecting prostheses to the body
• CPC Class Codes: A61F 2/4081 Glenoid components, e.g. cups
• CPC Class Codes: A61F 2002/30112 Rounded shapes, e.g. with rounded corners
• CPC Class Codes: A61F 2002/30158 trapezoidal
• CPC Class Codes: A61F 2002/30235 tubular, e.g. sleeves
• CPC Class Codes: A61F 2002/30405 made by screwing complementary threads machined on the parts themselves
• CPC Class Codes: A61F 2002/30606 Sets comprising both cemented and non-cemented endoprostheses
• CPC Class Codes: A61F 2002/30797 internally-threaded
• CPC Class Codes: A61F 2002/30845 with cutting edges
• CPC Class Codes: A61F 2002/30878 with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
• CPC Class Codes: A61F 2002/30884 Fins or wings, e.g. longitudinal wings for preventing rotation within the bone cavity
• CPC Class Codes: A61F 2002/30886 externally-threaded
• CPC Class Codes: A61F 2002/30892 parallel
• CPC Class Codes: A61F 2002/30894 inclined obliquely with respect to each other
• CPC Class Codes: A61F 2002/30909 Nets
• CPC Class Codes: A61F 2002/4631 the prosthesis being specially adapted for being cemented
• CPC Class Codes: A61F 2220/0025 Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2230/0004 Rounded shapes, e.g. with rounded corners
• CPC Class Codes: A61F 2230/0026 trapezoidal
• CPC Class Codes: A61F 2230/0069 cylindrical
• CPC Class Codes: A61F 2310/00023 : Titanium or titanium-based alloys, e.g. Ti-Ni alloys

Abstract

A glenoid prosthesis including a bearing shell, the reverse side of which has a plurality of anchoring pins which are arranged to one another. At least one anchoring pin has a coupling element, and at least one sleeve with a fitting securable coupling element and an outer anchoring structure is provided in order to selectively enable a cementing in of the anchoring pin or a mechanical hammering in of the pin together with the sleeve which is fixed to it.

Claims

1. A glenoid prosthesis comprising a plastic bearing shell including a plurality of integral anchoring pins that are arranged parallel to one another at a reverse side of the bearing shell, wherein at least one anchoring pin has a thread element and a corresponding metal sleeve that is preoperative solidly screwable to the at least one anchoring pin, and wherein the corresponding metal sleeve is provided with protruding longitudinal ribs for a mechanical hammering in of the metal sleeve into an undersized bone hole.

2. A prosthesis in accordance with claim 1, wherein all anchoring pins are provided with outer threads.

3. A prosthesis in accordance with claim 1, wherein the bearing shell and the pins consist of polyethylene.

4. A prosthesis in accordance with claim 1, wherein each metal sleeve is closed at a front end and consists of a titanium alloy.

5. A prosthesis in accordance with claim 1, wherein each metal sleeve has longitudinal ribs which are equally distributed over their periphery.

6. A prosthesis in accordance with claim 1, wherein the longitudinal ribs are designed in the manner of knives.

7. A prosthesis in accordance with claim 1, wherein with the exception of the anchoring pins, the reverse side of the bearing shell has a metallic mesh.

8. A prosthesis in accordance with the claim 1, wherein the anchoring pins became integral to the shell through friction welding.

9. A prosthesis in accordance with claim 1, wherein the bearing surface of the bearing shell and the reverse side of the bearing shell are sections of spherical surfaces, and wherein the bearing shell has a wall thickness between 3 mm and 7 mm.

10. A modular system comprising glenoid prosthesis, each prosthesis comprising a plastic bearing shell including a plurality of integral anchoring pins that are arranged parallel to one another at a reverse side of the bearing shell, wherein at least one anchoring pin has a thread element and a corresponding metal sleeve that is preoperative solidly screwable to the at least one anchoring pin, and wherein the corresponding metal sleeve is provided with protruding longitudinal ribs for a mechanical hammering in of the sleeve into an undersized bone hole, the modular system consisting of bearing shells with different outer dimensions, wherein the thread diameter of the pins are equally large for all bearing shells in order to be able to manage with one sleeve size.

11. A modular system in accordance with claim 10, wherein bore gauges are provided for the bearing shells, the guide diameter of which is furnished for borers with diameter D₂>

d≧

0.9D₁, with diameter D₂ corresponding to the diameter which is measured over the ribs and the diameter D₁ corresponding to the diameter over the sleeve body.