Apparatus for trialing a modular humeral head
AssigneeBiomet Manufacturing, LLC
InventorNathan A. Winslow
Life of this patent
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Abstract
The present disclosure is directed to a modular shoulder prosthesis measuring device having an adjustable radial offset provided by relative rotation of an adapter interdisposed between the stem and the head. Specifically, the interface configuration between the stem and the adapter, as well as between the adapter and the head are designed such that relative positioning of these components provides a continuous adjustment in the radial offset. Indicia are provided to precisely determine the magnitude and direction of the adjustment being made.
Claims20
An adjustable prosthesis comprising:
- a stem having a proximal face;
- a humeral head having an articulation surface and a bottom face opposite the articulation surface, the bottom face defining an elongated aperture having first and second ends defining a generally flat interface surface;
- and
- an adapter interposed between the proximal face and the bottom surface, the adapter defining a cylindrical coupling tapered portion having a centerline which is generally perpendicular to the interface surface, the adapter having a generally planar bearing surface configured to engage the interface surface so as to allow selective linear movement of the generally planar bearing surface with respect to the interface surface and of the humeral head with respect to the adapter from a first position to a second position in a direction perpendicular to the centerline and within the elongated aperture, the adapter and elongated aperture defining a variable sized cavity therebetween when the generally planar bearing surface is engaged with the interface surface.
A method of trialing an implant, the method comprising:
- coupling a head portion to an adapter having a coupling axis;
- displacing the head with respect to an articulating surface;
- rotating the head about a coupling axis with respect to the articulating surface;
- and
- displacing the head from a first position to a second position along a straight linear path defined by a pair of flat bearing surfaces of the adapter, generally perpendicular to the coupling axis with respect to the adapter.
An adjustable prosthesis comprising:
- a member having an articulating surface;
- a cylindrical coupling taper coupled to a bearing member, the coupling taper having an axis which is generally parallel to a pair of generally flat planar parallel bearing surfaces formed on the bearing member;
- and
- a means for measuring a linear offset of the member from an implanted fixation component, wherein the means for measuring a linear offset includes the pair of generally flat planar parallel bearing surfaces which are configured to allow linear translation of the coupling taper with respect to the member in a direction perpendicular to the axis.
Dependencies are inferred from the claim text.