Intramedullary nail assembly

Patent metadata

Field	Value
Publication number	US-11617604-B2
Application number	US-202016849009-A
Country	US
Kind code	B2
Filing date	Apr 15, 2020
Priority date	Apr 15, 2020
Publication date	Apr 4, 2023
Grant date	Apr 4, 2023

Abstract

An intramedullary nail assembly includes a body and an inlay. The body has an outer surface and an opposing inner surface. The outer surface extends from a leading end of the body to a trailing end of the body. The inner surface defines a cannulation that extends into the trailing end towards the leading end. The body comprises a leading body portion that defines the leading end, and a trailing body portion that defines the trailing end. The inlay is positionable within the cannulation of at least one of the leading body portion and the trailing body portion. The inlay includes an engagement member configured to engage the body to removably lock the inlay within the cannulation of the body.

First claim

What is claimed is:

1. An intramedullary nail assembly, comprising:
an intramedullary nail having an outer surface and an opposing inner surface, the outer surface extending from a leading end of the intramedullary nail to a trailing end of the intramedullary nail, the inner surface defining a cannulation that extends into the trailing end towards the leading end about a central axis of the intramedullary nail, the intramedullary nail defining at least one nail hole that extends into the outer surface and through the inner surface; and
an inlay having an outer surface and an opposing inner surface positionable within the cannulation, the inlay defining at least one inlay hole that extends into the outer surface of the inlay and through the inner surface of the inlay, the at least one nail hole being aligned with a respective at least one inlay hole when the inlay is positioned within the cannulation, the at least one nail hole having a cross-sectional dimension that is greater than a cross-sectional dimension of the respective at least one inlay hole,
wherein the inlay includes at least one engagement feature that extends from the outer surface and is configured to engage the intramedullary nail when the inlay is inserted into the cannulation through the trailing end so as to limit both of (1) translation of the inlay relative to the intramedullary nail along the central axis of the intramedullary nail toward the trailing end and (2) rotation of the inlay relative to the intramedullary nail about the central axis, and
wherein the at least one engagement feature includes an engagement member configured to engage the intramedullary nail to removably lock the inlay within the cannulation of the intramedullary nail, wherein the engagement member is configured flex inwardly toward a central axis of the intramedullary nail during insertion of the inlay into the cannulation.

2. The intramedullary nail assembly of claim 1 , wherein the intramedullary nail includes a receiving element, the receiving element being configured to engage the engagement member of the inlay to removably lock the inlay within the cannulation of the body.

3. The intramedullary nail assembly of claim 1 , wherein the engagement member is positioned adjacent to one of the at least one inlay hole.

4. The intramedullary nail assembly of claim 1 , wherein the inlay is a first inlay, and wherein the at least one nail hole is a first at least one nail hole, the first inlay being positionable within the cannulation of a trailing body portion of the intramedullary nail that extends from the trailing end toward the leading end, the intramedullary nail further comprising:
a second inlay having an outer surface and an opposing inner surface positionable within the cannulation of a leading body portion of the intramedullary nail that extends from the leading end toward the trailing end, the second inlay defining a second at least one inlay hole that extends into the outer surface of the second inlay and through the inner surface of the second inlay, wherein a second at least one nail hole of the intramedullary nail us aligned with a respective second at least one inlay hole when the second inlay is positioned within the cannulation, the alignment of the second at least one nail hole and the second inlay hole defining another assembly hole that extends through the intramedullary nail assembly.

5. The intramedullary nail assembly of claim 4 , wherein the engagement member is a first engagement member, wherein the second inlay includes a second engagement member configured to engage the intramedullary nail to removably lock the second inlay within the cannulation of the intramedullary nail.

6. The intramedullary nail assembly of claim 1 , wherein the at least one nail hole and the at least one inlay hole comprise fastener holes, and wherein the at least one nail hole is substantially congruent to the at least one inlay hole.

7. The intramedullary nail assembly of claim 1 , wherein the at least one nail hole and the at least one inlay hole comprise compression slots, and wherein the at least one nail hole is substantially congruent to the at least one inlay hole.

8. The intramedullary nail assembly of claim 1 , wherein the inner surface of the intramedullary nail defines a nail shoulder, and wherein the outer surface of the inlay defines an inlay shoulder, wherein contact between the nail shoulder and the inlay shoulder when the inlay is positioned within the cannulation of the intramedullary nail substantially prevents movement of the inlay relative to the intramedullary nail in an axial direction.

9. An inlay for an intramedullary nail assembly, the intramedullary nail assembly including an intramedullary nail having an outer surface and an opposing inner surface, the outer surface extending from a leading end of the intramedullary nail to a trailing end of the intramedullary nail, the inner surface defining a cannulation that extends into the trailing end towards the leading end about a central axis of the intramedullary nail, and the intramedullary nail defining at least one nail hole that extends into the outer surface to the inner surface, the inlay comprising:
an outer surface and an opposing inner surface positionable within the cannulation, the inlay defining at least one inlay hole that extends into the outer surface of the inlay and through the inner surface of the inlay, the at least one inlay hole being aligned with a respective at least one nail hole when the inlay is positioned within the cannulation, the at least one inlay hole having a cross-sectional dimension that is smaller than a cross-sectional dimension of the respective at least one nail hole; and
at least one engagement feature that extends from the outer surface and is configured to engage the intramedullary nail when the inlay is inserted into the cannulation through the trailing end so as to limit both of (1) translation of the inlay relative to the intramedullary nail along the central axis of the intramedullary nail toward the trailing end and (2) rotation of the inlay relative to the intramedullary nail about the central axis,
wherein the inlay includes a leading body portion that defines a leading end of the inlay, and a trailing body portion that defines a trailing end of the inlay, the trailing body portion being offset from the leading body portion along a trailing direction, wherein a cross sectional dimension of the trailing body portion is different than a cross sectional dimension of the leading body portion such that an interface between the leading body portion and the trailing body portion defines an inlay shoulder.

10. The inlay of claim 9 , wherein the at least one engagement feature includes an engagement member configured to engage the intramedullary nail to removably lock the inlay within the cannulation of the intramedullary nail.

11. The inlay of claim 9 , wherein the inner surface of the inlay defining a cannulation, wherein when the inlay is positioned within the cannulation of the nail body a central axis of the cannulation of the inlay substantially aligns with a central axis of the cannulation of the intramedullary nail.

12. The inlay of claim 11 , wherein the inlay defines a hole that extends into the outer surface of the inlay and through the inner surface of the inlay, the inlay hole being positioned to align with a hole defined by the intramedullary nail that extends into the outer surface of the intramedullary nail and through the inner surface of the intramedullary nail.

13. A method of assembling an intramedullary nail assembly, the method comprising:
aligning an inlay with an intramedullary nail, the intramedu

Assignees

• Depuy Synthes Products Inc

Inventors

• Koch Roger
• Widmer Walter
• Zbinden Heinz
• Allemann Mark

Classifications

• A61B17/7241 Primary

  the nail having separate elements through which screws pass · CPC title

• A61B2017/00526

  Methods of manufacturing · CPC title

• A61B2017/00862

  elastic or resilient · CPC title

• A61B17/7283

  with special cross-section of the nail · CPC title