# US 10,765,522 B2 · Joint surface replacement system

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- Number: US 10,765,522 B2
- Document ID: US10765522B2
- Status: Granted
- Kind: B2
- Application number: 15/829,495
- Filed: 2017-12-01
- Published: 2018-06-07
- Granted: 2020-09-08
- Earliest claimed: 2016-12-01
- Assignees: Accufix Surgical, Inc.
- Applicants: Glenn C. Vitale; Michael Parisi; Wayne Conlan
- Inventors: Glenn C. Vitale; Michael Parisi; Wayne Conlan
- Web page: https://patentgrep.com/patent/US10765522B2

## CPC

- A61B 17/1659: {Surgical rasps, files, planes, or scrapers}
- A61B 17/1682: {for the foot or ankle}
- A61F 2/30771: {applied in original prostheses, e.g. holes or grooves}
- A61F 2/4225: {for feet, e.g. toes}
- A61F 2/4606: {of wrists or ankles; of hands, e.g. fingers; of feet, e.g. toes}
- A61B 17/1617: {with mobile or detachable parts}
- A61B 2017/564: {Methods for bone or joint treatment}
- A61F 2/30744: {End caps, e.g. for closing an endoprosthetic cavity}
- A61F 2/4603: {for insertion or extraction of endoprosthetic joints or of accessories thereof}
- A61F 2002/30176: {V-shaped}
- A61F 2002/30299: {umbrella-shaped or mushroom-shaped}
- A61F 2002/30378: {Spherically-shaped protrusion and recess}
- A61F 2002/30616: {Sets comprising a plurality of prosthetic parts of different sizes or orientations}
- A61F 2002/30654: {Details of the concave socket}
- A61F 2002/30736: {Augments or augmentation pieces, e.g. wedges or blocks for bridging a bone defect}
- A61F 2002/3082: {Grooves}
- A61F 2002/30841: {Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes}
- A61F 2002/3085: {with a threaded, e.g. self-tapping, bone-engaging surface, e.g. external surface}
- A61F 2002/30873: {Threadings machined on non-cylindrical external surfaces}
- A61F 2002/3093: {for promoting ingrowth of bone tissue}
- A61F 2002/4233: {for metatarso-phalangeal joints, i.e. MTP joints}
- A61F 2310/00017: Iron- or Fe-based alloys, e.g. stainless steel
- A61F 2310/00023: Titanium or titanium-based alloys, e.g. Ti-Ni alloys
- A61F 2310/00179: Ceramics or ceramic-like structures
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C)

## 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.

## Claims

### Claim 1

A metatarsal-phalangeal articular surface replacement system comprising:
a metatarsal component sized and configured to be implanted into a metatarsal bone;
said metatarsal component having an exterior articular surface defined by a partially spherical convex head piece dimensioned to cover an end of said metatarsal bone;
said metatarsal component having an integral, centrally located screw for joining said metatarsal component to said metatarsal bone, said screw being affixed to an interior bone-engaging surface of said head piece and having a tapered threaded portion for allowing said metatarsal component to be anchored to the metatarsal bone;
said metatarsal component further having scalloped anti-rotation bone grips on said convex head piece for gripping said end of said metatarsal bone and for allowing solid fixation, said scalloped anti-rotation bone grips being integrally formed with and reside around a peripheral edge of said convex head piece;
a phalangeal component sized and configured to be implanted into a phalangeal bone;
said phalangeal component having an exterior articular surface defined by a concave head piece dimensioned to cover an end of said phalangeal bone;
said phalangeal component having an integral, centrally located screw for joining said phalangeal component to said phalangeal bone, said screw of the phalangeal component being affixed to an interior bone-engaging surface of said concave head piece and having a tapered threaded portion for allowing said phalangeal component to be anchored to the phalangeal bone;
said phalangeal component having channel-shaped anti-rotation bone grips on said concave head piece comprising radially-extending channels residing in the interior bone-engaging surface of said concave head piece, said channels allowing for ingrowth of said phalangeal bone within said channels to solidify fixation to the phalangeal bone;
one or more one-piece reamer tools each configured to countersink and surface grind said metatarsal and phalangeal bones within a single process step for prepping said metatarsal and phalangeal bones for insertion of said metatarsal and phalangeal components therein;
whereby said partially spherical convex head piece of the metatarsal component mates with said concave head piece of the phalangeal component to provide articular surface replacement,
wherein said scalloped anti-rotation bone grips comprise scalloped underside protrusions having angled edges,
wherein each of said convex head piece and said concave head piece further comprises a centrally located driver hole on the exterior articular surface thereof used for inserting said metatarsal and phalangeal components into said metatarsal and phalangeal bones.

### Claim 2 (depends on 1)

The system of claim 1 wherein said metatarsal component further includes channel-shaped anti-rotation bone grips in combination with the scalloped anti-rotation bone grips.

### Claim 3 (depends on 1)

The system of claim 1 wherein at least a portion of each of said screws is coated with a subchondral bone replacement in-growth coating.

### Claim 4 (depends on 1)

The system of claim 1 further including a subchondral bone replacement component connected to an undersurface of said metatarsal component, the subchondral bone replacement component residing between the metatarsal bone and the partially spherical convex head piece.

### Claim 5 (depends on 1)

The system of claim 1 wherein the metatarsal component has a radius, said radius having curved edges that engage said metatarsal bone.

### Claim 6 (depends on 1)

The system of claim 1 wherein the metatarsal component further includes a cap cover for insertion into said centrally located driver hole that prevents soft tissue and material build up within the driver hole.

### Claim 7 (depends on 1)

The system of claim 1 wherein said screw of the metatarsal component has a non-threaded head portion adjacent said tapered threaded portion and said tapered threaded portion has a length sufficient to extend through intact sub-chondral bone and into the medullary canal in said metatarsal bone.

### Claim 8 (depends on 1)

The system of claim 1 wherein said channels comprising said channel-shaped anti-rotation bone grips having a coarsely finished surface which is adapted to abut said metatarsal bone and which allows for ingrowth of said metatarsal bone to further solidify fixation to the metatarsal bone.

### Claim 9 (depends on 1)

The system of claim 1 wherein each of the head pieces has an outer surface which forms a cartilaginous articular surface and a coarsely finished interior surface for promoting boney ingrowth and thereby facilitating fixation.

### Claim 10 (depends on 1)

The system of claim 1 wherein each of the head pieces is tapered and is formed by an exterior surface having a radius of curvature different from a radius of curvature of an interior surface.

### Claim 11 (depends on 1)

The system of claim 1 wherein said metatarsal component is formed from a material selected from the group consisting of titanium, a titanium alloy, stainless steel and a chromium alloy.

### Claim 12 (depends on 1)

The system of claim 1 wherein each of said head pieces has an outer surface covered by a ceramic material.