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Patent Application
App. No. 13/233,514

Metatarsal Implant

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Quick Facts
Patent No.
US None
App. No.
13/233,514
Abstract

The present invention comprises a metatarsal head implant comprising a generally convex, hollow portion that fits over the metatarsal head of the great toe, a serrated stem, and one or more locking screws. The implant of the present invention may work in conjunction with either the patient's existing phalanx or one-piece phalanx implants designed and/or manufactured independently from the metatarsal implant.

Claims (47)

1 . A metatarsal implant comprising:

a substantially concavo-convex shaped body;

a concave portion of the shaped body conforming generally to the shape of an end of a metatarsal bone;

a convex surface of the body forming a bearing surface for a further bone of the foot;

the shaped body having at least one stem, the stem having a dorsal side and a plantar side, the stem being adapted for affixing the shaped body to the metatarsal bone.

2 . The implant of claim 1 wherein the metatarsal bone is the first metatarsal bone.

3 . The implant of claim 1 wherein the further bone is a phalanx.

4 . The implant of claim 1 wherein the metatarsal bone is surgically shaped to conform to the concavity of the shaped body.

5 . The implant of claim 1 wherein the stem projects perpendicularly from the concave portion of the shaped body, away from the convex surface of the shaped body

6 . The implant of claim 1 wherein the shaped body projects substantially over the dorsal side of the stem.

7 . The implant of claim 1 wherein the stem has a square cross-section.

8 . The implant of claim 1 wherein the stem has a rectangular cross-section.

9 . The implant of claim 1 wherein the stem has a triangular cross-section.

10 . The implant of claim 1 wherein the stem has a curved cross-section.

11 . The implant of claim 1 wherein the stem comprises serrations, apertures, or both.

12 . The implant of claim 1 wherein the stem further comprises a trocar tip.

13 . The implant of claim 1 wherein the stem further comprises a sharp, three-sided tip.

14 . The implant of claim 1 wherein the stem further comprises a sharp, four-sided tip.

15 . The implant of claim 1 wherein the stem may accept at least one fastener.

16 . The implant of claim 15 wherein the fastener is a screw.

17 . The implant of claim 15 wherein the fastener is a self-locking screw.

18 . The implant of claim 15 wherein the fastener is a rod.

19 . The implant of claim 15 wherein the fastener is a pin.

20 . The implant of claim 1 wherein the shaped body comprises cobalt chromium, cobalt chromium molybdenum, titanium, stainless steel, ceramic, or aluminum.

21 . A metatarsal implant comprising:

a substantially concavo-convex shaped body;

a concave portion of the shaped body conforming generally to the shape of an end of a metatarsal bone;

a convex surface of the body forming a bearing surface for a further bone of the foot;

the shaped body having at least one hollow stem, the hollow stem having a dorsal side and a plantar side, the stem being adapted for affixing the shaped body to the metatarsal bone.

22 . The implant of claim 21 wherein the metatarsal bone is the first metatarsal bone.

23 . The implant of claim 21 wherein the further bone is a phalanx.

24 . The implant of claim 21 wherein the metatarsal bone is surgically shaped to conform to the concavity of the shaped body.

25 . The implant of claim 21 wherein the hollow stem projects perpendicularly from the concave portion of the shaped body, away from the convex surface of the shaped body

26 . The implant of claim 21 wherein the shaped body projects substantially over the dorsal side of the hollow stem.

27 . The implant of claim 21 wherein the hollow stem has a square cross-section.

28 . The implant of claim 21 wherein the hollow stem has a rectangular cross-section.

29 . The implant of claim 21 wherein the hollow stem has a triangular cross-section.

30 . The implant of claim 21 wherein the hollow stem has a curved cross-section.

31 . The implant of claim 21 wherein the hollow stem comprises at least one of serrations, apertures, or fenestrations.

32 . The implant of claim 21 wherein the hollow stem further comprises a distal portion.

33 . The implant of claim 32 wherein the distal portion further comprises a plurality of cutting surfaces.

34 . The implant of claim 21 wherein the stem is substantially filled with osteogenic material, osteostimulatory material, or both.

35 . The implant of claim 21 wherein the shaped body comprises cobalt chromium, cobalt chromium molybdenum, titanium, stainless steel, ceramic, or aluminum.

36 . A method for implanting a metatarsal implant, the method comprising the steps of providing a metatarsal implant comprising a substantially concavo-convex shaped body; a concave portion of the shaped body conforming generally to the shape of an end of a metatarsal bone; a convex surface of the body forming a bearing surface for a further bone of the foot; the shaped body having at least one stem; the stem being adapted for affixing the shaped body to the metatarsal bone;

conical reaming of the head of a metatarsal bone to form a contoured, anatomical shape;

placing and positioning of the stem and shaped body into the shaft of the metatarsal bone; and

securing the shaped body using fasteners inserted through the stem.

Assignments (1)
SECURITY AGREEMENT Recorded Dec 5, 2011
From: SMALL BONE INNOVATIONS, INC.
To: NEW HEALTH CAPITAL PARTNERS MANAGEMENT LP, AS ADMINISTRATIVE AGENT
Reel/Frame 027323/0919 →