Joint surface replacement system
Inventors
Vitale, Glenn C. • Parisi, Michael • CONLAN, WAYNE
Assignees
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Publication Number
US-10959851-B2
Publication Date
2021-03-30
Expiration Date
Abstract
The present invention relates to an articular joint replacement system. The system has first and second components. Each component has a tapered head piece for covering the end of a bone and for acting as an articular surface, an integrally formed screw stem having a length sufficient to extend into the medullary canal, and inwardly angled bone grips affixed to the underside of the head piece to allow solid fixation to the bone by compression press fit. The head piece of the first component is provided with a shaped exterior surface which complements the shaped exterior surface of the head piece of the second component and which allows motion in three planes.
Core Innovation
The invention provides a metatarsal or phalangeal articular surface replacement system that includes a first component sized and configured to be implanted into a first bone. The first component comprises an exterior articular surface defined by a head piece dimensioned to cover an end of the first bone, with a centrally located driver hole on the exterior articular surface for inserting the first component into the first bone. The head piece is tapered and includes an exterior surface having a radius of curvature that differs from the radius of curvature of an interior surface.
The first component further includes anti-rotation bone grips for gripping the end of the first bone and for allowing solid fixation. The anti-rotation bone grips are integrally formed with and reside on an interior surface of the head piece or around a peripheral edge of the head piece, and are selected from channel-shaped anti-rotation bone grips, scalloped anti-rotation bone grips, or combinations thereof. The first component also includes an integral, centrally located screw affixed to an interior bone-engaging surface of the head piece, with a tapered threaded portion configured to anchor the first component to the first bone.
The invention also provides a one-piece reamer tool configured to countersink and surface grind the first bone in a single process step for preparing the bone for insertion of the first component therein. The described system is shaped to provide compatible mating articular surfaces and to permit motion in three planes through a complementary convex/concave arrangement of exterior surfaces.
Claims Coverage
The independent claim covers a metatarsal or phalangeal articular surface replacement system with an implantable tapered head piece carrying integrally formed anti-rotation grips, a centrally located integral tapered threaded screw, and a one-piece reamer tool that countersinks and surface grinds in a single process step. The claim set further specifies additional structural and retaining features through dependent claims.
Tapered metatarsal or phalangeal articular surface replacement head piece with different radii
A metatarsal or phalangeal articular surface replacement system wherein the head piece is tapered and is formed by an exterior surface having a radius of curvature different from a radius of curvature of the interior surface.
Integrally formed anti-rotation bone grips for solid fixation
Anti-rotation bone grips on the head piece for gripping the end of the first bone and for allowing solid fixation, the anti-rotation bone grips being integrally formed with and residing on an interior surface of the head piece or around a peripheral edge of the head piece, and selected from channel-shaped anti-rotation bone grips, scalloped anti-rotation bone grips, or combinations thereof.
Integral centrally located tapered threaded screw anchored to the first bone
An integral, centrally located screw for joining the first component to the first bone, the screw being affixed to an interior bone-engaging surface of the head piece and having a tapered threaded portion for allowing the first component to be anchored to the first bone.
One-piece reamer tool countersinking and surface grinding in a single process step
A one-piece reamer tool configured to countersink and surface grind the first bone in a single process step for preparing the bone for insertion of the first component therein.
Centrally located driver hole on the head piece exterior articular surface
A centrally located driver hole on the exterior articular surface of the head piece for inserting the first component into the first bone.
Overall, the claim coverage centers on a tapered head piece with different exterior and interior radii, anti-rotation bone grips selected from channel-shaped or scalloped configurations, an integral centrally located tapered threaded screw for anchoring, and a one-piece reamer tool that countersinks and surface grinds in a single process step.
Stated Advantages
Allows solid fixation through anti-rotation bone grips gripping the end of the first bone.
Enables preparation of the bone for insertion using a one-piece reamer tool configured to countersink and surface grind in a single process step.
Facilitates motion in three planes through complementary convex/concave mating articular surfaces.
Promotes fixation through a coarsely finished interior surface promoting boney ingrowth.
Documented Applications
Metatarsal or phalangeal articular surface replacement.
Preparing a bone for insertion of the first component using a one-piece reamer tool that countersinks and surface grinds the first bone in a single process step.
Using anti-rotation grips and a tapered threaded screw to anchor the first component to a first bone end.
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