Implantable trapezium prosthetic and methodology for treatment of arthritis in the thumb cmc joint
OwnerNathan MORRELL, Dimitri MADDEN +4inventors
InventorsNathan MORRELL, Dimitri MADDEN, Lauren A. OSTERMANN, Diego Enrique RODRIGUEZ, August William FINKE, Ethan C. DARWIN
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Abstract
A procedure and device that resolves CMC arthritis by mimicking a thumb CMC joint fusion, while avoiding common shortcomings of the fusion surgery as well as existing alternative surgeries for thumb CMC arthritis which can also replace the trapezium bone in the carpometacarpal joint with a stemmed trapezial implant. In addition, the trapezial implant device replicates skeletal anatomy and is configured to directly contact native bone and cartilage in order to more evenly distribute stresses.
Claims24
An implant for replacing a trapezium bone in a human hand, the implant comprising:
- a rigid body base sized and shaped to resemble the trapezium bone;
- and
- a rigid body stem sized and shaped to be inserted inside a reamed first metacarpal along a central axis of an intramedullary canal of the reamed first metacarpal;
- wherein the rigid body base includes:
- a first curvature that is configured to fit an opposing surface of an adjacent trapezoid,
- a second curvature that is configured to fit an opposing surface of a distal pole of a scaphoid, and
- a third curvature that is configured to fit a saddle shape at a base of the reamed first metacarpal;
- and
- wherein the rigid body stem is an attachable extrusion extending from the rigid body base for insertion into the reamed first metacarpal.
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An implant kit for replacing at least one trapezium, the implant kit comprising:
- a plurality of bases including a first base and a second base,
- wherein each base, of the plurality of bases, includes:
- first curvature that is configured to fit an opposing surface of an adjacent trapezoid;
- a second curvature that is configured to fit an opposing surface of a distal pole of a scaphoid;
- and
- a third curvature that is configured to fit a saddle shape at a base of a first metacarpal;
- and
- a plurality of stems including a first stem and a second stem,
- wherein the first stem is a first attachable extrusion extending from a first location on the first base, and
- wherein the second stem is a second attachable extrusion extending from a second location on the second base,
- wherein the second location is different than the first location.
An implant kit for replacing a trapezium, the implant kit comprising:
- a base and a plurality of stems;
- wherein the base includes:
- a first curvature that is configured to fit an opposing surface of an adjacent trapezoid;
- a second curvature that is configured to fit an opposing surface of a distal pole of a scaphoid, and
- a third curvature that is configured to fit a saddle shape at a base of a first metacarpal;
- and
- wherein each stem of the plurality of stems is configured to attach to the base at a different angle.
Dependencies are inferred from the claim text.