Variable prosthesis

Patent metadata

Field	Value
Publication number	US-9326862-B2
Application number	US-201414257526-A
Country	US
Kind code	B2
Filing date	Apr 21, 2014
Priority date	Dec 2, 2011
Publication date	May 3, 2016
Grant date	May 3, 2016

Abstract

The present teachings are directed to a shoulder prosthesis having an adjustable radial offset and/or angular inclination provided by relative rotation of an adapter interdisposed between a stem and a head. In one example, a prosthesis has a stem having a first longitudinal axis. The prosthesis can also include an adaptor including a first taper. The first taper can have a first taper axis. The prosthesis can include a head supported by the adaptor. The head can be selectively oriented and then coupled to the first taper and the combination can be selectively orientated and the coupled to the stem.

First claim

What is claimed is:

1. A prosthesis system comprising:
a head having an articulating surface, a head female taper formed into the head, wherein a head center axis of the head is offset a first radial distance from a head taper center axis of the head female taper;
an adapter having a first side, an opposed second side, an outer surface defining an adapter male taper, an adapter female taper formed into the adapter through the first side, and a stem facing taper surface, wherein an adapter center axis of the adapter is offset a second radial distance from an adapter female taper axis; and
a stem having a body and a neck, wherein the neck has an outer surface that defines a neck male taper,
wherein the head, the adapter, and the neck are selectively connected to form a selected head offset relative to the stem, and
wherein the stem facing taper surface of the adapter is configured to provide clearance between the adapter and the stem.

2. The prosthesis system of claim 1 , wherein a cross section of the stem facing taper surface defines at least one straight line extending from the first side to the outer surface of the adapter.

3. The prosthesis system of claim 1 , wherein the articulating surface of the head is configured to articulate within at least one of an acetabular prosthesis or an acetabulum of a patient.

4. The prosthesis system of claim 3 , wherein the articulating surface of the head defines more than one-half of a sphere.

5. A prosthesis system comprising:
a head including an articulating surface and a head female taper formed into the head, wherein a head center axis of the head is offset a first radial distance from a head taper center axis of the head female taper;
an adapter including a first side, an opposed second side, an outer surface defining an adapter male taper, an adapter female taper formed into the adapter through the first side, and a stem facing taper surface, wherein an adapter center axis of the adapter is offset a second radial distance from an adapter female taper axis; and
a stem including a body and a neck, wherein the neck has an outer surface that defines a neck male taper,
wherein the stem facing taper surface of the adapter provides clearance between the adapter and the stem.

6. The prosthesis system of claim 5 , wherein the head center axis of the head is defined through a center of the articulating surface.

7. The prosthesis system of claim 6 , wherein the head taper center axis of the head female taper is defined through a center of the head female taper and a taper angle of the head female taper is defined relative to the head taper center axis.

8. The prosthesis system of claim 7 , wherein the first radial distance is between 1 mm and 10 mm.

9. The prosthesis system of claim 5 , wherein the adapter center axis of the adapter is defined through a center of the adapter.

10. The prosthesis system of claim 9 , wherein the adapter female taper axis of the adapter female taper is defined through a center of the adapter female taper and a taper angle of the adapter female taper is defined relative to the adapter female taper axis.

11. The prosthesis system of claim 10 , wherein the second radial distance is between 1 mm and 10 mm.

12. The prosthesis system of claim 5 , wherein the head female taper and the adapter male taper are operable to lock together.

13. The prosthesis system of claim 5 , wherein the adapter is operable to be rotated relative to the head to achieve an offset.

14. A prosthesis system comprising:
a head sized and shaped for articulation with at least one of an acetabulum or an acetabular prosthesis, the head including:
an articulating surface defining more than a hemisphere and a diameter,
an opposite surface generally opposed to the articulating surface,
a head female taper formed into the head through the opposite surface,
wherein a head center axis of the head is offset a first radial distance from the head taper center axis of the head female taper, and wherein the head center axis is defined through a center portion of the articulating surface of the head that is configured to articulate with a pelvis of a patient;

an adapter having a first side and a second side generally opposed to the first side, the adapter further having an adapter outer surface defining an adapter male taper and an adapter female taper formed into the adapter from the first side, wherein the adapter has an adapter center axis offset a second radial distance from an adapter female taper axis;
a stem having a body and a neck, wherein the neck extends at an angle relative to the body and the neck has a neck outer surface that defines a neck male taper;
wherein the head, the adapter, and the neck are selectively connected to achieve a selected head offset relative to the stem.

15. The prosthesis system of claim 14 , wherein the adapter is operable to be rotated relative to the head to achieve an offset of the head center axis and the adapter female taper axis between a maximum offset and substantially no offset.

16. The prosthesis system of claim 15 , wherein the articulating surface defining more than the hemisphere defines at least 80% of a sphere.

17. The prosthesis system of claim 14 , wherein the first radial distance is between 1 mm and 10 mm.

18. The prosthesis system of claim 14 , wherein the second radial distance is between 1 mm and 10 mm.

19. The prosthesis system of claim 14 , wherein the head is the acetabular prosthesis, and wherein the acetabular prosthesis is operable to be placed in an acetabulum of the patient and articulate with the articulating surface of the head.

20. The prosthesis system of claim 14 further comprising:
a first demarcation on the head; and
a second demarcation on the adapter,
wherein the first demarcation and the second demarcation are operable to be aligned to determine whether the selected head offset relative to the stem is achieved.

Assignees

• Biomet Mfg Llc

Inventors

• Smith Aaron P
• Stone Kevin T
• Cordaro Nicholas M

Classifications

• A61F2002/30593

  hollow · CPC title

• A61F2002/30339

  Double cones, i.e. connecting element having two conical connections, one at each of its opposite ends · CPC title

• A61F2002/365

  Connections of heads to necks · CPC title

• A61F2002/30392

  Rotation · CPC title

• A61F2002/30474

  using an intermediate sleeve interposed between both prosthetic parts to be coupled · CPC title