Implant peg with multiple components

Patent metadata

Field	Value
Publication number	US-10568744-B2
Application number	US-201615559739-A
Country	US
Kind code	B2
Filing date	Oct 5, 2016
Priority date	Oct 5, 2016
Publication date	Feb 25, 2020
Grant date	Feb 25, 2020

Abstract

An implant system comprises an implant plate adapted to be positioned on a surface of a resected bone. The implant plate has a plurality of openings. A plurality of independently positionable pegs attach the implant plate to the bone. Each peg has a longitudinal axis and comprises: a peg body and a retaining device. The peg body is inserted into a peg hole in the bone. The peg body has a transverse dimension in a direction normal to the longitudinal axis, the transverse dimension larger than the openings of the plate. The retaining device is separate from the peg body, and is configured to attach to the peg body, with at least a first portion of the retaining device positioned above an upper surface of the implant plate, and a connecting portion of the retaining device extending through one of the openings of the implant plate.

First claim

What is claimed is:

1. An implant system, comprising:
an implant plate adapted to be positioned on a surface of a resected bone, the implant plate having a plurality of openings therethrough;
a plurality of independently positionable pegs for attaching the implant plate to the resected bone, each peg having a longitudinal axis and comprising:
a peg body adapted to be inserted into a respective peg hole in the resected bone, the peg body having a transverse dimension in a direction normal to the longitudinal axis, the transverse dimension larger than the plurality of openings, and
a retaining device separate from the peg body, the retaining device configured to attach to the peg body, with at least a first portion of the retaining device positioned above an upper surface of the implant plate, and a connecting portion of the retaining device extending therethrough.

2. The implant system of claim 1 , wherein:
the peg body of at least one of the plurality of pegs has a cylindrical portion with an outer diameter greater than an outer diameter of a corresponding one of the plurality of openings, the peg body having an inner wall defining an interior cavity along a longitudinal axis thereof, and
the retaining device of the at least one of the plurality of pegs is an inner component having a proximal head larger than the corresponding one of the plurality of openings and a distal body sized to fit through the corresponding one of the plurality of openings, the body of the inner component configured to engage the inner wall of the peg body.

3. The implant system of claim 2 , wherein the inner wall is threaded, and the inner component is a screw.

4. The implant system of claim 2 , wherein the inner wall has a taper and the outer peg body has a corresponding taper.

5. The implant system of claim 4 , wherein the taper is a Morse taper.

6. The implant system of claim 4 , wherein the outer peg body has a plurality of radial slots extending downward from a top of the outer peg body, so that the outer peg body is adapted to deflect radially when the inner component is inserted into the outer peg body.

7. An implant system, comprising:
an implant plate configured to be positioned on a surface of a resected bone, the implant plate having a plurality of openings therethrough;
a plurality of independently positionable pegs for attaching the implant plate to the resected bone, each peg having a longitudinal axis and comprising:
a peg body adapted to be inserted into a respective peg hole in the resected bone, the peg body having a transverse dimension in a direction normal to the longitudinal axis, the transverse dimension larger than a diameter of at least one of the plurality of openings, the peg body further comprising a proximal connecting portion penetrating one of the openings of the implant plate, and
a retaining device separate from the peg body, the retaining device configured to attach to the peg body, with at least a first portion of the retaining device above an upper surface of the implant plate.

8. The implant system of claim 7 , wherein the transverse dimension is at a central portion of the peg body.

9. The implant system of claim 8 , wherein the transverse dimension is a diameter of the peg body.

10. The implant system of claim 7 , wherein each of the plurality of openings is configured to receive a second portion of the retaining device or the connecting portion of the peg body at a plurality of different angles.

11. The implant system of claim 10 , wherein and each peg in the plurality of pegs is adapted to be inserted at a respective angle relative to the implant plate, independently from the angle of each remaining peg in the plurality of pegs.

12. The implant system of claim 10 , wherein the implant plate is a talar plate adapted to be positioned on a surface of a resected talus.

13. The implant system of claim 7 , wherein each peg in the plurality of pegs is adapted to be positioned at a respectively different angle.

14. The implant system of claim 7 , wherein the peg body of the at least one peg has a textured surface on a portion thereof.

15. The implant system of claim 7 , wherein the peg body has a thread on at least the connecting portion of the peg body, and the retaining device is a threaded cap configured to engage the thread of the connecting portion when the thread extends through the corresponding one of the plurality of openings.

16. The implant system of claim 7 , wherein:
the peg body of at least one of the plurality of pegs has a cylindrical portion with a diameter greater than a diameter of a corresponding one of the plurality of peg holes,
the connecting portion of the peg body of the at least one of the plurality of pegs is a threaded member, the threaded member having an outer diameter smaller than a diameter of a corresponding one of the plurality of openings, and
the retaining device of the at least one of the plurality of pegs comprises a threaded cap configured to engage the threaded member when the threaded member extends through the corresponding one of the plurality of openings.

17. The implant system of claim 7 , wherein:
the connecting portion of the peg body of the at least one of the plurality of pegs has a tapered outer surface, the tapered outer surface having a maximum outer diameter smaller than a diameter of a corresponding one of the plurality of openings, and
the retaining device of the at least one of the plurality of pegs comprises a tapered inner surface configured to engage the tapered outer surface when the tapered outer surface extends through the corresponding one of the plurality of openings.

18. The implant system of claim 17 , wherein the tapered outer surface and the tapered inner surface form a Morse taper joint.

19. The implant system of claim 7 , further comprising a talar dome having a mounting surface attachable to the implant plate and an articulating surface opposite the mounting surface.

20. The implant system of claim 7 , wherein the plurality of pegs includes at least one of the group consisting of:
at least two different peg body lengths,
at least two different peg body diameters, or
at least two different peg configurations.

21. A method, comprising:
(a) drilling at least two peg holes into a resected surface of a bone;
(b) assembling at least two pegs to an implant plate, the implant plate having a plurality of openings, each of the two pegs having a longitudinal axis and a peg body with a transverse dimension in a direction normal to the longitudinal axis, the transverse dimension larger than the plurality of openings
(c) inserting a screw through the implant and into the peg body of at least one of the at least two pegs; and
(d) attaching the implant to the bone so that the at least two pegs are inserted in the at least two peg holes.

22. The method of claim 21 , wherein each peg has a retaining device, and step (b) includes attaching the one of the peg bodies to the retaining device, with at least a first portion of the retaining device positioned above the implant plate, and either a second portion of the retaining device or a portion of the peg body penetrating a respective opening in the implant plate.

23. The method of claim 21 , wherein step (b) includes inserting a tapered member through the implant and through the peg body of at least one of the at least two pegs to form a Morse taper joint.

24. The method of claim 21 , wherein step (b) incl

Assignees

• Wright Medical Tech Inc

Inventors

• Dhillon Braham K
• Free Daniel E
• Luna Ramon

Classifications

• A61F2002/30433

  using additional screws, bolts, dowels, rivets or washers e.g. connecting screws · CPC title

• A61F2002/30594

  slotted, e.g. radial or meridian slot ending in a polar aperture, non-polar slots, horizontal or arcuate slots · CPC title

• A61F2002/30154

  square · CPC title

• A61F2002/30332

  Conically- or frustoconically-shaped protrusion and recess · CPC title

• A61F2002/30143

  hexagonal · CPC title