Expandable intramedullary systems and methods of using the same

Patent metadata

Field	Value
Publication number	US-9827025-B2
Application number	US-201514946894-A
Country	US
Kind code	B2
Filing date	Nov 20, 2015
Priority date	Nov 20, 2015
Publication date	Nov 28, 2017
Grant date	Nov 28, 2017

Abstract

Intramedullary systems, expandable intramedullary nails, expandable anchors, and methods of using the same. The intramedullary system may include an expandable intramedullary nail configured to extend into an intramedullary canal of a long bone and/or one or more expandable anchors configured to extend at an angle transverse to the intramedullary nail. The intramedullary nails and/or anchors may include one or more integrated expansion mechanisms that allow for insertion in a contracted configuration and expansion into a deployed configuration to lock the relative position and prevent axial rotation and translation of the system.

First claim

What is claimed is:

1. An intramedullary nail comprising:
a longitudinal nail body adapted to be inserted into an intramedullary canal of a long bone, the nail body having a lateral or angled through-hole adapted to receive an anchor;
an adjustment rod including a distal portion and a proximal portion that has a lateral opening through which the anchor is received, wherein a longitudinal length of the lateral opening is longer than a diameter of the received anchor to allow longitudinal movement of the adjustment rod relative to the nail body;
a first fixation member disposed in the nail body and adapted to be radially deployed from the nail body by the longitudinal movement of the adjustment rod; and
a second fixation member disposed in the nail body and adapted to be radially deployed from the nail body simultaneously with the first fixation member by the longitudinal movement of the adjustment rod.

2. The intramedullary nail of claim 1 , wherein the lateral opening has a threaded inner surface, further comprising:
a drive screw threaded to the inner surface of the lateral opening of the adjustment rod and adapted to be rotated by a tool when resting on a shoulder of the nail body such that rotation of the threaded drive screw causes the longitudinal movement of the adjustment rod.

3. The intramedullary nail of claim 1 , wherein the nail body has a threaded inner surface, further comprising:
a locking screw threaded to the inner surface of the nail body and adapted to receive a tool operable to thread the locking screw towards the anchor to lock the anchor to the nail body.

4. The intramedullary nail of claim 1 , further comprising:
a drive screw threaded to an inner surface of the adjustment rod and having a longitudinal through-hole sized and shaped to allow a tool to pass through the threaded drive screw; and
a locking screw threaded to an inner surface of the nail body and having a recess sized and shaped to receive the tool passing through the threaded drive screw, wherein the threaded locking screw is adapted to be threaded towards the anchor by the tool to lock the anchor to the nail body.

5. The intramedullary nail of claim 1 , wherein:
the proximal portion of the adjustment rod includes one or more extension members; and
the nail body is arranged with a pair of oppositely positioned grooves that are sized and shaped to receive a respective one of the extension members to prevent axial rotation of the adjustment rod.

6. The intramedullary nail of claim 1 , wherein:
the adjustment rod has a distal portion arranged with one of a tongue and groove at a predetermined angle relative to a longitudinal axis of the nail body; and
the first fixation member is arranged with the other one of tongue and groove such that the longitudinal movement of the adjustment rod radially deploys the first fixation member from the nail body.

7. The intramedullary nail of claim 6 , wherein:
the other one of tongue and groove is arranged on a tab disposed on an inner surface of the first fixation member; and
the tab extends orthogonally from, and is disposed along a longitudinal edge of, the inner surface of the first fixation member.

8. The intramedullary nail of claim 1 , wherein the first fixation member has an outer surface arranged with teeth that are adapted to contact an inner surface of the intramedullary canal when the first fixation member is radially deployed from the nail body.

9. The intramedullary nail of claim 1 , wherein:
each of the first and second fixation members has an inner surface that is arranged with a plurality of spaced apart tabs that extend orthogonally from, and along longitudinal edges of, the inner surface of their respective fixation members; and
the spaced apart tabs of the first fixation member are adapted to interleave with the spaced apart tabs of the second fixation member after the adjustment rod moves longitudinally within the nail body.

10. An intramedullary nail comprising:
a longitudinal nail body adapted to be inserted into an intramedullary canal of a long bone, the nail body having a lateral or angled through-hole adapted to receive a proximal anchor wherein the nail body has a threaded inner surface;
an adjustment rod including a distal portion and a proximal portion that has a lateral opening through which the proximal anchor is received, wherein a longitudinal length of the lateral opening is longer than a diameter of the received proximal anchor to allow longitudinal movement of the adjustment rod relative to the nail body;
a first fixation member disposed in the nail body and having an outer surface, wherein the first fixation member is adapted to be radially deployed from the nail body by the longitudinal movement of the adjustment rod to have the outer surface of the first fixation member contact an inner surface of the intramedullary canal; and
a locking screw threaded to the inner surface of the nail body and having a recess adapted to receive a tool that is operable to thread the locking screw towards the proximal anchor so as to cause an underside of the locking screw to engage the proximal anchor and lock the proximal anchor to the nail body.

11. The intramedullary nail of claim 10 , wherein the lateral opening has a threaded inner surface, further comprising:
a drive screw threaded to the inner surface of the lateral opening of the adjustment rod and adapted to rest on a shoulder of the nail body, wherein the drive screw is arranged with a longitudinal through-hole sized and shaped to receive a tool that is operable to rotate the threaded drive screw on the shoulder to cause the longitudinal movement of the adjustment rod.

12. The intramedullary nail of claim 10 , further comprising:
a drive screw threaded to an inner surface of the lateral opening of the adjustment rod and having a longitudinal through-hole sized and shaped to allow a tool to pass through the threaded drive screw; and
a locking screw threaded to the inner surface of the nail body and having a diameter that is smaller than the drive screw, wherein the locking screw is arranged with a recess that is adapted to receive the tool passing through the drive screw such that rotation of the locking screw by the tool causes an underside of the locking screw to engage the proximal anchor and lock the proximal anchor to the nail body.

13. The intramedullary nail of claim 10 , wherein:
the proximal portion of the adjustment rod includes a pair of oppositely positioned prongs; and
the nail body is arranged with a pair of oppositely positioned grooves that are sized and shaped to receive a respective one of the prongs, wherein the grooves have a length that is longer than the prongs to allow the prongs to slide in their respective groove as the adjustment rod moves longitudinally within the nail body.

14. The intramedullary nail of claim 10 , wherein:
the distal portion of the adjustment rod is arranged with a plurality of tongues having a predetermined angle relative to a longitudinal axis of the nail body; and
the first fixation member is arranged with a plurality of guide grooves, with each guide groove being adapted to receive a respective one of the tongues such that the longitudinal movement of the adjustment rod radially deploys the first fixation member from the nail body.

15. The intramedullary nail of claim 10 , wherein:
the first fixation member has an inner surface arranged with a plurality of spaced apart tabs, with each tab having a guide groove; and
the plurality of spaced apart tabs extend orthogonally from, and are disposed along longitudinal edges of, the inner surfa

Assignees

• Globus Medical Inc

Inventors

• Jansen David

Classifications

• A61B17/7216 Primary

  for bone lengthening or compression (A61B17/7258 takes precedence) · CPC title

• A61B17/7275

  with expanding cylindrical parts · CPC title

• A61B17/744

  the longitudinal elements coupled to an intramedullary nail · CPC title

• A61B17/7266

  with fingers moving radially outwardly · CPC title

• A61B17/7258 Primary

  with laterally expanding parts, e.g. for gripping the bone · CPC title