Spinal stabilization device

Patent metadata

Field	Value
Publication number	US-9655650-B2
Application number	US-201414518914-A
Country	US
Kind code	B2
Filing date	Oct 20, 2014
Priority date	Jun 28, 2007
Publication date	May 23, 2017
Grant date	May 23, 2017

Abstract

A bone attachment device comprises an attachment collar having a hinged lid is disclosed. The bone attachment device may also comprise a bone fastener (such as a bone screw). A bone attachment device including an attachment collar and a spinal rod locking device is disclosed. A bone attachment device as described herein may be used together with a spinal stabilization rod and one or more additional bone attachment devices. Such devices are adapted to clamp and hold a spinal stabilization rod. Methods for implanting a spinal stabilizer having a bone attachment device including a hinged lid are disclosed.

First claim

What is claimed is:

1. A method for implanting a spinal stabilization device comprising:
delivering a first bone attachment device to a first pedicle, wherein the first bone attachment device comprises:
a first bone fastener having a distal portion adapted to pierce bone and a proximal portion having a head; and
a first collar comprising:
a collar wall defining cavity and having at least one wall aperture;
a distal portion comprising an opening and a collar seat projecting inward and supporting a head of the bone fastener;
a proximal portion having a hinged lid; and
a spinal rod locking device, wherein at least a portion of the spinal rod locking device is within the cavity defined by the collar wall, wherein the spinal rod locking device comprises a nut comprising a distal cam surface adapted to impart distal force to a clamp member, whereby force imparted by turning the nut about an axis is directed distally, wherein the spinal rod locking device comprises the clamp member comprising a proximal cam surface;

fastening the distal portion of the first bone fastener to the first pedicle;
placing a rod within the aperture of the first bone attachment device;
locking the first bone attachment device, wherein the locking comprises:
pivoting the hinged lid toward the first collar over the rod;
engaging an overhang of the first collar with a collar engagement member of the spinal rod locking device of the first collar, wherein the proximal cam surface of the clamp member interacts with the distal cam surface of the nut to receive distal force from the nut and impart distal force to the rod extending through the wall aperture.

2. A method for using a collar of a bone attachment device, comprising:
providing a collar comprising:
(i) a collar wall having a cavity and a collar overhang;
(ii) a hinged lid coupled to the collar wall with a pivot pin, the hinged lid having a central aperture; and
(iii) a spinal rod locking device extending through at least a portion of the central aperture, the spinal rod locking device comprising:
(a) a nut having a distal cam surface and a collar engagement member projecting radially from only a segment of an outer diameter surface of the nut; and
(b) a clamp member having a proximal cam surface;

rotating the nut from an unlocked configuration wherein the collar engagement member does not engage the collar overhang to a locked configuration wherein the collar engagement member engages the collar overhang and the distal cam surface imparts a force to the proximal cam surface.

3. The method of claim 2 , further comprising extending a bone fastener through an opening of the collar.

4. The method of claim 3 , wherein the bone fastener has polyaxial movement with the collar.

5. The method of claim 2 , further comprising pivoting the hinged lid about the pivot pin from an open configuration to a closed configuration.

6. The method of claim 5 , further comprising locking the hinged lid with the collar wall in the closed configuration.

7. The method of claim 2 , further comprising inserting a rod through an aperture in the collar wall.

8. The method of claim 2 , wherein rotating the nut further comprises imparting a force to a rod extending through an aperture in the collar wall.

9. The method of claim 2 , wherein rotating the nut further comprises imparting a force to a bone fastener extending through an opening in the collar.

10. The method of claim 2 , wherein rotating the nut further comprises locking the position and orientation of a bone fastener relative to the collar.

11. The method of claim 2 , wherein the collar engagement member does not extend around the entire outer diameter of the nut.

12. A method for using a collar of a bone attachment device, comprising:
providing a collar comprising: a collar wall, a hinged lid coupled to the collar wall with a pivot pin, and a spinal rod locking device comprising a nut and a clamp, wherein at least a portion of the spinal rod locking device is within the hinged lid;
inserting a rod into the collar;
pivoting the hinged lid and the spinal rod locking device about a pivot pin;
locking the hinged lid to the collar;
rotating the nut to engage an outer surface of the nut with an inner surface of the collar wall and engage a distal cam surface of the nut with a proximal cam surface of the clamp, thereby translating rotational motion of the nut into axial motion of at least the clamp distally along an axis.

13. The method of claim 12 , further comprising extending a bone fastener through an opening of the collar.

14. The method of claim 13 , wherein the bone fastener has polyaxial movement with the collar.

15. The method of claim 12 , wherein rotating the nut further comprises imparting a force to a rod extending through an aperture in the collar wall.

16. The method of claim 12 , wherein rotating the nut further comprises imparting a force to a bone fastener extending through an opening in the collar.

17. The method of claim 12 , wherein rotating the nut further comprises locking the position and orientation of a bone fastener relative to the collar.

18. The method of claim 12 , wherein the collar engagement member does not extend around the entire outer diameter of the nut.

19. The method of claim 12 , wherein rotating a nut of the spinal rod locking device comprises rotating the nut from an unlocked configuration wherein a collar engagement member of the outer surface of the nut does not engage a collar overhang of the collar wall to a locked configuration wherein the collar engagement member engages the collar overhang.

20. The method of claim 12 , further comprising rotating the nut after locking the hinged lid to the collar.

Assignees

• Spinal Elements Inc

Inventors

• Blain Jason
• Martin Gregory
• Lake Matthew

Classifications

• A61B17/7037

  wherein pivoting is blocked when the rod is clamped · CPC title

• A61B17/7032 Primary

  Screws or hooks with U-shaped head or back through which longitudinal rods pass · CPC title

• A61B17/7002 Primary

  Longitudinal elements, e.g. rods · CPC title