Acetabular cup, method and tool and installing the same

• US 5,486,181 A
• Filed: 08/04/1994
• Issued: 01/23/1996
• Est. Priority Date: 08/04/1994
• Status: Expired due to Term

• Current Assignee: Zimmer Trabecular Metal Technology, Inc. (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Implex Corp. (Consorteum Holdings, Inc.)
• Inventors: Zubok, Rafial, Cohen, Robert C.
• Primary Examiner(s): Willse, David H.
• Assistant Examiner(s): SNOW, BRUCE EDWARD
• Application Number:
  US08/286,003
• Time in Patent Office: 537 Days
• Field of Search: 606/91, 606/99, 606/100, 606/86, 623/22
• US Class Current: 606/91
• CPC Class Codes: A61B 17/86 Pins or screws or threaded wires; nuts therefor A61B17/72 take precedence
• CPC Class Codes: A61F 2/30767 Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
• 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 2/4612 of shoulders
• CPC Class Codes: A61F 2002/30016 differing in hardness, e.g. Vickers, Shore, Brinell
• CPC Class Codes: A61F 2002/30112 Rounded shapes, e.g. with rounded corners
• CPC Class Codes: A61F 2002/30153 rectangular
• CPC Class Codes: A61F 2002/30322 differing in surface structures
• CPC Class Codes: A61F 2002/30337 Inverted concave conical connections, e.g. for opposing disconnection
• CPC Class Codes: A61F 2002/30378 Spherically-shaped protrusion and recess
• CPC Class Codes: A61F 2002/30387 Dovetail connection
• CPC Class Codes: A61F 2002/3071 Identification means; Administration of patients
• CPC Class Codes: A61F 2002/3082 Grooves
• CPC Class Codes: A61F 2002/30879 Ribs
• CPC Class Codes: A61F 2002/30881 Circumferential ribs, flanges or fins
• CPC Class Codes: A61F 2002/30883 dovetail-shaped
• CPC Class Codes: A61F 2002/30968 Sintering
• CPC Class Codes: A61F 2002/3406 Oblong apertures
• CPC Class Codes: A61F 2002/342 : the outer shell having circumferential protrusions parallel to the equatorial plane, e.g. circumferential fins or wings
• CPC Class Codes: A61F 2002/3443 : with an anti-luxation elevated rim portion, e.g. on the inner shell
• CPC Class Codes: A61F 2002/3456 : ellipsoidal or having a flattened polar region
• CPC Class Codes: A61F 2220/0025 : Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• 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 2230/0004 : Rounded shapes, e.g. with rounded corners
• CPC Class Codes: A61F 2230/0019 : rectangular
• CPC Class Codes: A61F 2250/0019 : differing in hardness, e.g. Vickers, Shore, Brinell
• CPC Class Codes: A61F 2250/0026 : differing in surface structures
• CPC Class Codes: A61F 2250/0087 : colour-coded
• 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 2310/00413 : Coating made of cobalt or of Co-based alloys
• CPC Class Codes: A61F 2310/00952 : Coating, pre-coating or prosthesis-covering structure made of bone cement, e.g. pre-applied PMMA cement mantle

Abstract

An acetabular cup having an outer shell of a hard material defining a cavity circumscribed by an annular surface, and a bearing insert of a material which is softer than the material of the outer shell, the bearing insert being disposed within the cavity of the shell, and coupling tracks disposed on the annular surface for coupling a tool to the outer shell, the tool being used for installing the cup in a patient'"'"'s acetabulum, the coupling tracks operating to prevent the tool from damaging the bearing insert during the installation of the cup. The tool for installing the acetabular cup of the present invention, comprises a handle for aligning and driving the acetabular cup into a patient'"'"'s acetabulum which control the rotational, pivotal and axial alignment and an adaptor for coupling the handle to the acetabular cup, the adaptor having leg members for engaging the corresponding coupling tracks positioned on the annular surface of the outer shell when the leg members are brought into contact with the annular surface of the outer shell and the adaptor is rotated relative to the acetabular cup.

Claims

1. A tool for installing an acetabular cup having an outer shell of a hard material with a cavity circumscribed by a peripheral surface, and a bearing insert of a material which is softer than said material of said outer shell disposed within said cavity of said shell, said tool comprising:

handle means for aligning and driving the acetabular cup into said acetabulum;

adaptor means for coupling said handle means to said acetabular cup, said adaptor means having leg means for engaging corresponding leg receiving means positioned on the peripheral surface of the outer shell when said leg means are brought into contact with the peripheral surface of the outer shell and said adaptor means is rotated relative to said acetabular cup, said leg means including a pair of substantially parallel oriented leg members unitarily formed with said adaptor means, and locking means for preventing relative rotation between said adaptor means and the acetabular cup when said leg means of said adaptor means are engaged with the leg receiving means of the outer shell, said locking means being slidably oriented between said pair of leg members.

2. The tool according to claim 1, wherein said handle means includes release means for deactivating said locking means of said adaptor means and allowing relative rotation between said adaptor means and the acetabular cup so that said legs means of said adaptor means can be disengaged form the leg receiving means of the outer shell.

3. The tool according to claim 1, wherein said handle means further includes assist handle means for aligning said cup within said acetabulum.

4. The tool according to claim 1, wherein said adaptor means further includes chuck means and said handle means further includes chuck receiving means, said chuck means on said adaptor means and said chuck receiving means on said handle means coacting to couple and uncouple said adaptor means and said handle means.

5. The tool according to claim 1, wherein said adaptor means further includes indicia means, said indicia means allowing said adaptor to be selectively matched by size with a corresponding acetabular cup.