Joint surface replacement system
Inventors
Vitale, Glenn C. • Parisi, Michael • CONLAN, WAYNE
Assignees
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Publication Number
US-10765522-B2
Publication Date
2020-09-08
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 relates to a metatarsal-phalangeal articular surface replacement system that includes a metatarsal component and a phalangeal component. The metatarsal component has an exterior articular surface defined by a partially spherical convex head piece dimensioned to cover an end of a metatarsal bone, and the phalangeal component has an exterior articular surface defined by a partially spherical concave head piece dimensioned to cover an end of a phalangeal bone, where the convex and concave head pieces mate to provide articular surface replacement.
Each component further includes an integral, centrally located screw joined to an interior bone-engaging surface of the respective head piece, with a tapered threaded portion to anchor the component to the corresponding bone. The metatarsal component includes scalloped anti-rotation bone grips integrally formed around a peripheral edge of the convex head piece for gripping the end of the metatarsal bone to allow solid fixation.
For the phalangeal component, channel-shaped anti-rotation bone grips are provided on the concave head piece as radially-extending channels residing in the interior bone-engaging surface, and these channels allow for ingrowth of the phalangeal bone within the channels to solidify fixation. The system also includes one or more one-piece reamer tools configured to countersink and surface grind the metatarsal and phalangeal bones within a single process step for prepping the bones for insertion of the respective components, and each head piece further comprises a centrally located driver hole on the exterior articular surface used for inserting the components.
Claims Coverage
The independent claim identifies six inventive features in an integrated metatarsal-phalangeal joint surface replacement system: partially spherical convex/concave mating head pieces, integral centrally located tapered screws, metatarsal anti-rotation bone grips, phalangeal anti-rotation bone grips with bone ingrowth, one-piece reamer tools for single process-step countersinking and surface grinding, and centrally located driver holes on the exterior articular surfaces.
Metatarsal component with partially spherical convex head piece and integral centrally located tapered screw
A metatarsal component sized and configured to be implanted into a metatarsal bone, where the metatarsal component has an exterior articular surface defined by a partially spherical convex head piece dimensioned to cover an end of the metatarsal bone, and where the metatarsal component has an integral, centrally located screw affixed to an interior bone-engaging surface of the head piece with a tapered threaded portion for anchoring to the metatarsal bone.
Scalloped anti-rotation bone grips around the convex head piece
The metatarsal component further includes scalloped anti-rotation bone grips integrally formed around a peripheral edge of the convex head piece for gripping the end of the metatarsal bone and allowing solid fixation.
Phalangeal component with partially spherical concave head piece and integral centrally located tapered screw
A phalangeal component sized and configured to be implanted into a phalangeal bone, where the phalangeal component has an exterior articular surface defined by a partially spherical concave head piece dimensioned to cover an end of the phalangeal bone, and where the phalangeal component has an integral, centrally located screw affixed to an interior bone-engaging surface of the concave head piece with a tapered threaded portion for anchoring to the phalangeal bone.
Channel-shaped anti-rotation bone grips with radially-extending channels
The phalangeal component includes channel-shaped anti-rotation bone grips on the concave head piece, comprising radially-extending channels in the interior bone-engaging surface that allow for ingrowth of the phalangeal bone within the channels to solidify fixation.
One-piece reamer tools for single process-step bone preparation
One or more one-piece reamer tools configured to countersink and surface grind the metatarsal and phalangeal bones within a single process step for prepping the bones for insertion of the components.
Convex and concave head pieces with centrally located driver holes
The partially spherical convex head piece and the concave head piece mate to provide articular surface replacement, and each head piece further comprises a centrally located driver hole on the exterior articular surface used for inserting the metatarsal and phalangeal components.
The main inventive features are the convex/concave partially spherical mating configuration for articular surface replacement, integral centrally located tapered screws affixed to interior bone-engaging surfaces, metatarsal scalloped anti-rotation bone grips, phalangeal channel-shaped anti-rotation bone grips that allow ingrowth, one-piece reamer tools for countersinking and surface grinding within a single process step, and centrally located driver holes.
Stated Advantages
Low-mass reduced breakage and reduced weight.
Eliminate detritic synovitis.
Preserve subchondral bone and improve shock absorption.
Stable anti-rotation fixation.
Improved radiographic visibility.
Documented Applications
Total first metatarsal-phalangeal joint replacement.
Potential extension to other joints.
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