Intramedullary nail locking hole arrangement

Patent metadata

Field	Value
Publication number	US-9408645-B2
Application number	US-201114343875-A
Country	US
Kind code	B2
Filing date	Sep 16, 2011
Priority date	Sep 16, 2011
Publication date	Aug 9, 2016
Grant date	Aug 9, 2016

Abstract

An intramedullary nail has a driving end portion and a non-driving end portion with a longitudinal axis. The non-driving end portion comprises a locking hole arrangement with a sequence of four holes, i.e. spaced from non-driving to driving end a first hole, a second hole, a third hole, and a fourth hole. The first hole and the fourth hole have a corresponding first orientation and the second hole and the third hole have a corresponding second orientation.

First claim

The invention claimed is:

1. An intramedullary nail, comprising
a driving end portion, and
a non-driving end portion having a longitudinal axis,
wherein the non-driving end portion comprises a locking hole arrangement with a first hole, a second hole, a third hole and a fourth hole all having a center axis intersecting the longitudinal axis,
wherein the first hole is arranged closer to a non-driving end of the intramedullary nail than the second hole, the second hole is arranged closer to the non-driving end than the third hole, and the third hole is arranged closer to the non-driving end than the fourth hole,
wherein the first hole and the fourth hole have a corresponding first orientation with respect to a circumference of the nail and the second hole and the third hole have a corresponding second orientation with respect to the circumference of the nail different than the first orientation, and
wherein a distance between the center axis of the first hole and the center axis of the second hole is equal to a distance between the center axis of the third hole and the center axis of the fourth hole.

2. The intramedullary nail according to claim 1 , wherein the first orientation is a medio-lateral (ML) orientation and the second orientation is an anterior-posterior (AP) orientation.

3. The intramedullary nail according to claim 1 , wherein the first hole, the second hole, the third hole and the fourth hole are adapted for receiving a distal locking screw.

4. The intramedullary nail according to claim 1 , wherein at least one of the first hole, the second hole, the third hole and the fourth hole being orthogonally oriented with respect to the longitudinal axis of the non-driving end portion.

5. The intramedullary nail according to claim 1 , wherein the distance from a non-driving end of the intramedullary nail to:
the center axis of the first hole is 4 to 44 mm,
the center axis of the second hole is 9 to 49 mm,
the center axis of the third hole is 24 to 64 mm, and
the center axis of the fourth hole is 29 to 69 mm.

6. The intramedullary nail according to claim 1 , further comprising a fifth hole.

7. The intramedullary nail according to claim 6 , wherein at least one of the first hole, the second hole, the third hole, the fourth hole and the fifth hole comprises a thread.

8. The intramedullary nail according to claim 6 , wherein the fifth hole has the same orientation as the first hole and the fourth hole and being arranged half the way between the second hole and the third hole.

9. The intramedullary nail according to claim 6 , wherein the distance from the non-driving end of the intramedullary nail to the fifth hole is 16.5 to 56.5 mm.

10. The intramedullary nail according to claim 1 , further comprising a transponder.

11. The intramedullary nail according to claim 10 , wherein the transponder is arranged in a fifth hole.

12. The intramedullary nail according to claim 10 , wherein the transponder is adapted for generating a signal wherein the transponder has a first preferred radiation direction, in which first preferred radiation direction the signal has symmetry characteristics, allowing determining the orientation of the first preferred radiation direction.

13. The intramedullary nail according to claim 12 , wherein the first preferred radiation direction aligns with the orientation of a fifth hole.

14. The intramedullary nail according to claim 10 , wherein the transponder is adapted for generating a signal being indicative for determining at least one of a spatial position and spatial orientation of the transponder so as to allow determining a respective spatial position and spatial orientation of at least one of the first hole, the second hole, the third hole and the fourth hole based on a predetermined spatial position and spatial orientation of the respective first hole, second hole, third hole, and fourth hole with respect to the transponder.

15. The intramedullary nail of claim 1 , wherein the distance between the center axes of the second and third holes is greater than the distance between the center axes of the first and second holes.

16. A system comprising the intramedullary nail according to claim 10 and a targeting detector, wherein the targeting detector is arranged to detect the signal generated by the transponder.

17. The system according to claim 16 , wherein the targeting detector is adapted to being temporarily fixed to the intramedullary nail via a coupling device.

18. The system according to claim 16 , wherein the detector is arranged to detect the orientation of the transponder, wherein the detector is adapted for signaling the correspondence of the orientation of at least one of the first hole, the second hole, the third hole and the fourth hole and a targeting orientation, based on a predetermined spatial position and spatial orientation of the respective first hole, second hole, third hole, and fourth hole with respect to the transponder.

19. An intramedullary nail, comprising:
a driving end portion;
a non-driving end portion having a longitudinal axis;
wherein the non-driving end portion comprises a locking hole arrangement with a first hole, a second hole, a third hole and a fourth hole;
wherein the first hole is arranged closer to a non-driving end of the intramedullary nail than the second hole, the second hole is arranged closer to the non-driving end then the third hole, and the third hole is arranged closer to the non-driving end then the fourth hole;
wherein the first hole and the fourth hole have the same first angular orientation with respect to the longitudinal axis in first and second parallel transverse planes through the circumference of the nail and the second hole and the third hole have the same angular second orientation with respect to the longitudinal axis in third and fourth parallel transverse planes parallel to the first and second transverse planes through the circumference of the nail, the first angular orientation different that the second angular orientation,
wherein a distance between a center axis of the first hole and a center axis of the second hole is equal to a distance between a center axis of the third hole and a center axis of the fourth hole, and
wherein the first orientation is a medio-lateral (ML) orientation and the second orientation is an anterior-posterior (AP) orientation.

20. The intramedullary nail according to claim 19 , wherein each of the first hole, the second hole, the third hole and the fourth hole are orthogonally oriented with respect to the longitudinal axis of the non-driving end portion.

Assignees

• Graca Claudia
• Homeier Annika
• Howling Ilan
• Kaiser Edgar
• Stryker European Holdings I Llc

Inventors

• Graca Claudia
• Homeier Annika
• Howling Ilan
• Kaiser Edgar

Classifications

• A61B17/72

  Intramedullary devices, e.g. pins or nails · CPC title

• A61B17/7233 Primary

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

• A61B17/1725

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

• A61B19/54

  Human Necessities · mapped topic

• A61B5/06

  Devices, other than using radiation, for detecting or locating foreign bodies {; Determining position of diagnostic devices within or on the body of the patient} · CPC title