Lockable intramedullary fixation device

Patent metadata

Field	Value
Publication number	US-9320551-B2
Application number	US-18314208-A
Country	US
Kind code	B2
Filing date	Jul 31, 2008
Priority date	Jan 26, 2007
Publication date	Apr 26, 2016
Grant date	Apr 26, 2016

Abstract

An orthopedic device can include an intramedullary nail with a longitudinal bore, first and second bone fasteners with sleeves and a cannulated movable member received within the longitudinal bore. The movable member defines first and second guiding bores for receiving respectively the first and second fasteners. Each of the first and second guiding bores includes a pair of opposing deformable elongated strips. Each pair of strips can engage the sleeve of a corresponding bone fastener.

First claim

What is claimed is:

1. An orthopedic device comprising:
an intramedullary implant defining a longitudinal bore;
first and second fasteners, each fastener including a threaded shaft and a substantially cylindrical unthreaded sleeve;
a cannulated movable member receivable within the longitudinal bore and telescopically movable relative to the longitudinal bore, the movable member defining first and second guiding bores for respectively receiving the first and second fasteners, each of the first and second guiding bores at an angle relative to the longitudinal bore, each of the first and second guiding bores including a pair of opposing deformable elongated strips formed on walls of each of the first and second guiding bores of the movable member and engageable with the respective unthreaded sleeve, the movable member movable between a fastener engagement position and a fastener disengagement position,
wherein the first guiding bore extends along a first axis, and the pair of opposing deformable elongated strips formed on the wall of the first guiding bore extend in a direction substantially parallel to the first axis.

2. The orthopedic device of claim 1 , further comprising a third fastener having a threaded portion, and wherein the movable member includes a third guiding bore, the third guiding bore including threads engageable with the threaded portion of the third fastener.

3. The orthopedic device of claim 2 , further comprising a locking member threadably engageable to the longitudinal bore and couplable to the movable member, such that rotation the locking member telescopically moves the movable member within the longitudinal bore.

4. The orthopedic device of claim 3 , wherein the locking member includes a resilient portion defining a flange engaging an internal groove of the movable member.

5. The orthopedic device of claim 4 , wherein the locking member includes a thread-interrupting opening and a thread lock receivable in the opening.

6. The orthopedic device of claim 2 , wherein the second guiding bore extends along a second axis substantially parallel to the first axis and the third guiding bore extends along a third axis that intersects the first and second axes.

7. The orthopedic device of claim 6 , wherein the second guiding bore is defined by a first opening, the third guiding bore is defined by a second opening, and the second opening is in communication with the first opening.

8. The orthopedic device of claim 1 , wherein the movable member includes a proximal outer surface having an elongated cross-section and mateably receivable within a proximal inner surface of the longitudinal bore.

9. The orthopedic device of claim 8 , wherein the elongated cross-section is substantially elliptical.

10. The orthopedic device of claim 1 , wherein the intramedullary implant includes an elongated compression slot for a corresponding bone fastener and one of the guiding bores is aligned with the compression slot, such that the movable member can be selectively moved between positions that allow or disallow movement of the fastener relative to the compression slot.

11. The orthopedic device of claim 1 , further comprising a locking member threadably engageable with the longitudinal bore of the intramedullary implant and non-threadably received into the movable member such that rotation of the locking member telescopically moves the movable member within the longitudinal bore of the intramedullary implant.

12. An orthopedic device comprising:
an intramedullary implant defining a longitudinal bore;
first and second fasteners, each of the first and second fasteners including a threaded shaft telescopically received in a corresponding substantially cylindrical unthreaded sleeve;
a third fastener including a threaded shaft;
a cannulated movable member receivable within the longitudinal bore and telescopically movable relative to the longitudinal bore, the movable member defining first, second and third guiding bores for selectively receiving respectively the first, second and third fasteners, the first and second guiding bores extending along axes substantially parallel to each other, the third guiding bore extending along an axis intersecting the axes of the first guiding bore and second guiding bore, the second guiding bore defined by a first opening and the third guiding bore defined by a second opening, the second opening in communication with the first opening, the first, second and third guiding bores oriented at variable angles relative to the longitudinal bore, each of the first and second guiding bores including a pair of opposing deformable elongated strips formed on walls of each of the first and second guiding bores and engageable with the respective unthreaded sleeve, the third guiding bore including a threaded formation engageable with the threaded shaft of the third fastener, the movable member movable between a fastener engagement position and a fastener disengagement position, the pair of opposing deformable elongated strips of the first guiding bore extending in a direction substantially parallel to the axis of the first guiding bore; and
a locking member threadably engageable with the longitudinal bore of the intramedullary implant and non-threadably received into the movable member such that rotation of the locking member telescopically moves the movable member within the longitudinal bore of the intramedullary implant.

13. The orthopedic device of claim 12 , wherein the locking member includes a resilient portion non-rotatably couplable to the movable member.

14. The orthopedic device of claim 13 , wherein the locking member includes a threaded portion threadably couplable to a proximal portion of the longitudinal bore of the intramedullary implant.

15. The orthopedic device of claim 14 , wherein the locking member includes a thread-interrupting opening and a thread lock receivable in the opening.

16. The orthopedic device of claim 12 , wherein the movable member includes a proximal outer surface having an elongated cross-section and mateably receivable within a proximal inner surface of the longitudinal bore.

17. The orthopedic device of claim 12 , wherein the third guiding bore of the movable member intersects the first and second guiding bores of the movable member.

18. The orthopedic device of claim 12 , wherein the intramedullary implant includes an elongated compression slot aligned with one of the guiding bores.

19. The orthopedic device of claim 12 , wherein the first and second guiding bores of the movable member are substantially parallel.

Assignees

• Frank Philip H
• O'Reilly Joseph M
• Elghazaly Timothy M
• Biomet Mfg Llc

Inventors

• Frank Philip H
• O'Reilly Joseph M
• Elghazaly Timothy M

Classifications

• A61B17/7241 Primary

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

• A61B17/7233 Primary

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

• A61B17/725

  with locking pins or screws of special form · CPC title

• A61B17/7225

  for bone compression · CPC title

• A61B17/1725

  for applying transverse screws or pins through intramedullary nails or pins · CPC title