Hammertoe implant promoting bony in-growth

Patent metadata

Field	Value
Publication number	US-10321940-B2
Application number	US-201615367932-A
Country	US
Kind code	B2
Filing date	Dec 2, 2016
Priority date	Dec 3, 2015
Publication date	Jun 18, 2019
Grant date	Jun 18, 2019

Abstract

Joint implants, such as joint implants used for placement in toes to treat hammertoe are described. More particularly, joint implants that include a proximal portion configured to be inserted into a first bone, a distal portion configured to be inserted into a second adjacent bone, and an elongated body positioned between the distal and distal portion is described. The elongated body can define a length and include at least one metal rod extending from the proximal portion to the distal portion and a porous mesh extending along at least a portion of the elongated body length. The porous mesh can be configured to allow for bony in-growth upon implantation, wherein the elongated body defines a generally square cross section and is configured to be inserted into drilled circular holes in the first and second hones. Methods of fusing two adjacent phalanges of a two are also described.

First claim

The claimed invention is:

1. A joint implant, comprising:
a proximal portion insertable into a drilled hole disposed in a first bone, the proximal portion having a solid proximal end that is bullet-shaped to ease insertion of the proximal portion into the first bone;
a distal portion insertable into a drilled hole disposed in a second bone, the second bone positioned adjacent to the first bone, the distal portion having a solid distal end that is bullet-shaped to ease insertion of the distal portion into the second bone;
an elongated body extending between the proximal portion and the distal portion and defining a hollow interior, an elongated body length, and an exterior surface, the elongated body comprising at least one metal rod extending from the proximal portion to the distal portion; and
a metallic porous structure positioned within a portion of the hollow interior of the elongated body and projecting outwardly from the exterior surface of the elongated body such that a plurality of voids created by the metallic porous structure extend from an exterior of the elongated body to the hollow interior of the elongated body;
wherein the proximal portion includes a length over which the at least one metal rod and the metallic porous structure do not extend.

2. The joint implant of claim 1 , wherein the first bone comprises a proximal phalanx of a toe and the second bone comprises a middle phalanx of a toe.

3. The joint implant of claim 1 , wherein the first bone comprises a middle phalanx of a toe and the second bone comprises a distal phalanx of a toe.

4. The joint implant of claim 1 , wherein the first bone comprises a metatarsal and the second bone comprises a proximal phalanx of a toe.

5. The joint implant of claim 1 , wherein the metallic porous structure comprises a porous titanium alloy.

6. The joint implant of claim 1 , wherein the at least one metal rod comprises titanium.

7. The joint implant of claim 1 , further comprising first and second tabs extending outwardly from the elongated body, the first and second tabs positioned on opposing sides of the elongated body.

8. The joint implant of claim 7 , wherein the first and second tabs are configured to prohibit the distal portion from being implanted beyond a given distance into the drilled hole of the first or second bone.

9. The joint implant of claim 7 , wherein the first and second tabs have a generally hemispheric profile.

10. The joint implant of claim 7 , wherein the first and second tabs have a generally triangular profile.

11. The joint implant of claim 1 , wherein the at least one metal rod comprises a plurality of metal rods which define a perimeter along the length of the elongated body and correspond to the overall cross-sectional profile.

12. The joint implant of claim 11 , wherein the metallic porous structure is positioned generally between the plurality of metal rods along at least a portion of the elongated body length.

13. The joint implant of claim 12 , wherein at least a portion of the metallic porous structure extends outside of the perimeter defined by the metal rods.

14. The joint implant of claim 12 , wherein at least a portion of the metallic porous structure remains within the perimeter defined by the metal rods.

15. The joint implant of claim 1 , wherein the proximal and distal portions are integrally formed with the at least one metal rod.

16. The joint implant of claim 1 , wherein the proximal and distal portions comprise titanium.

17. The joint implant of claim 1 , wherein the elongated body defines a generally rectangular cross section.

18. The joint implant of claim 1 , wherein the metallic porous structure is structured to mimic a porous structure of human cancellous bone.

19. A joint implant, comprising:
a proximal portion insertable into a drilled hole disposed in a first bone, the proximal portion having a solid proximal end that is rounded to ease insertion of the proximal portion into the first bone;
a distal portion insertable into a drilled hole disposed in a second bone, the second bone positioned adjacent to the first bone, the distal portion having a solid distal end that is rounded to ease insertion of the distal portion into the second bone;
an elongated body extending between the proximal portion and the distal portion and defining a hollow interior, an elongated body length, and an exterior surface, the elongated body comprising a plurality of metal rods extending from the proximal portion to the distal portion; and
a metallic porous structure positioned within a portion of the hollow interior of the elongated body and projecting outwardly from the exterior surface of the elongated body such that a plurality of voids created by the metallic porous structure extend from an exterior of the elongated body to the hollow interior of the elongated body;
wherein the plurality of metal rods, the proximal portion, and the distal portion are integrally formed; and
wherein the proximal portion includes a length over which the plurality of metal rods and the metallic porous structure do not extend.

20. A joint implant, comprising:
a proximal portion insertable into a drilled hole disposed in a first bone, the proximal portion having a solid proximal end that is tapered to ease insertion of the proximal portion into the first bone;
a distal portion insertable into a drilled hole disposed in a second bone, the second bone positioned adjacent to the first bone, the distal portion having a solid distal end that is tapered to ease insertion of the distal portion into the second bone;
an elongated body extending between the proximal portion and the distal portion and defining a hollow interior, an elongated body length, and an exterior surface, the elongated body comprising a plurality of metal rods extending from the proximal portion to the distal portion; and
a metallic porous structure positioned within a portion of the hollow interior of the elongated body and projecting outwardly from the exterior surface of the elongated body such that a plurality of voids created by the metallic porous structure extend from an exterior of the elongated body to the hollow interior of the elongated body;
wherein the elongated body defines a generally rectangular cross section; and
wherein the proximal portion includes a length over which the plurality of metal rods and the metallic porous structure do not extend.

Assignees

• Biomet Mfg Llc

Inventors

• Anderson David M
• Westphal Chad
• Barouk Pierre

Classifications

• A61F2002/30622

  Implant for fusing a joint or bone material · CPC title

• A61B17/7291 Primary

  for small bones, e.g. in the foot, ankle, hand or wrist · CPC title

• A61F2/30771

  applied in original prostheses, e.g. holes or grooves · CPC title

• A61B17/7233 Primary

  with special means of locking the nail to the bone · CPC title

• A61F2/4225

  for feet, e.g. toes · CPC title