System for corrective spinal surgery and method of use

Patent metadata

Field	Value
Publication number	US-9517099-B2
Application number	US-201414541222-A
Country	US
Kind code	B2
Filing date	Nov 14, 2014
Priority date	Nov 15, 2013
Publication date	Dec 13, 2016
Grant date	Dec 13, 2016

Abstract

A pedicle screw locking system includes a reduction tube and a locking driver. The reduction tube includes an inner shaft, a pair of grips, a reduction sleeve, and a rotatable tube. The inner shaft has a threaded end and reduction arms distally extending from the threaded end. Each grip of the pair of grips has a finger configured to engage the receiver of a pedicle screw. The reduction sleeve and the rotatable tube are disposed over and coaxially aligned with the inner shaft. The rotatable tube is coupled to the reduction sleeve. The rotatable tube moves the reduction sleeve relative to the reduction arms. The locking driver includes a threaded portion and a blunt tip. The threaded portion is configured to thread into threads in the receiver of the pedicle screw until the blunt tip locks the receiver of the pedicle screw.

First claim

What is claimed:

1. A pedicle screw locking system comprising:
a reduction tube, including:
an inner shaft having a threaded end and reduction arms extending distally from the threaded end, each reduction arm defining a groove in an outer surface thereof;
a pair of grips each having a finger adjacent a distal end thereof, each grip of the pair of grips received within the groove of a respective reduction arm, each finger configured to engage a receiver of a pedicle screw;
a reduction sleeve disposed over and coaxially aligned with the inner shaft, the reduction sleeve radially fixed relative to the inner shaft; and
a rotatable tube disposed over and coaxially aligned with the threaded end of the inner shaft, the rotatable tube coupled to a proximal end of the reduction sleeve, the rotatable tube moving the reduction sleeve relative to the reduction arms; and

a locking driver including a locking shaft defining a proximal end and a distal end thereof, the distal end of the locking shaft including a threaded portion and a blunt tip extending from the threaded portion, the locking shaft insertable through the reduction tube and configured to lock the pedicle screw engaged by the pair of grips.

2. The system of claim 1 , wherein the rotatable tube is rotatably coupled to the proximal end of the reduction sleeve.

3. The system of claim 2 , wherein the rotatable tube is rotated about the threaded end of the inner shaft to move the reduction sleeve relative to the reduction arms.

4. The system of claim 1 further comprising a release button received within a button opening of the rotatable tube, the button opening being a blind hole orthogonal to a longitudinal axis of the rotatable tube, the release button including a shaft slot that receives the threaded end of the inner shaft therethrough.

5. The system of claim 4 , wherein the shaft slot includes a threaded portion configured to engage the threaded end of the inner shaft.

6. The system of claim 5 , wherein the release button has a first position, wherein the threaded portion is engaged with the threaded end of the inner shaft such that as the rotatable tube is rotated the release button engages the rotatable tube to move the reduction sleeve relative to the reduction arms, and a second position, wherein the threaded portion is spaced-apart from the threaded end of the inner shaft.

7. The system of claim 6 , wherein the rotatable tube includes a button biasing member urging the release button towards the first position.

8. The system of claim 1 , wherein the inner shaft defines a recess between the threaded end and the reduction arms and each grip of the pair of grips includes a ring portion, the ring portion of each grip of the pair of grips received within the recess to longitudinally fix each grip of the pair of grips relative to the inner shaft.

9. The system of claim 1 , wherein the reduction sleeve retains the pair of grips within the grooves of the reduction arms.

10. The system of claim 1 , wherein the reduction arms define a reduction slot therebetween.

11. The system of claim 1 , wherein the locking driver includes a handle defining an opening, the proximal end of the locking shaft received within the opening of the handle.

12. The system of claim 11 , wherein the opening and the proximal end are shaped such that the locking shaft cooperates with rotation of the handle.

13. A method for locking a pedicle screw comprising:
engaging a receiver of a pedicle screw with fingers of a pair of grips of a reduction tube, the reduction tube including:
an inner shaft having a threaded end and reduction arms extending distally from the threaded end, each reduction arm defining a groove in an outer surface thereof, each grip of the pair of grips received within a respective groove;
a reduction sleeve; and
a rotatable tube; and

inserting a locking shaft through the reduction tube; and
threading a threaded portion of the locking shaft into threads in the receiver of the pedicle screw until a blunt tip of the locking shaft extending distally from the threaded portion engages a portion of the pedicle screw to lock the pedicle screw.

14. The method of claim 13 further comprising manipulating the reduction tube to reposition a vertebra engaged by the pedicle screw after the pedicle screw is locked by the locking shaft.

15. The method of claim 14 further comprising unthreading the locking shaft from the receiver of the pedicle screw to unlock the pedicle screw.

16. The method of claim 13 further comprising inserting a spinal rod through a reduction slot defined between the reduction arms.

17. The method of claim 16 further comprising seating the spinal rod inserted through the reduction slot into the receiver of the pedicle screw.

18. The method of claim 17 , wherein seating the spinal rod includes rotating the rotatable tube about the inner shaft.

19. The method of claim 17 further comprising securing the spinal rod to the receiver of the pedicle screw with a set screw after the spinal rod is seated.

20. The method of claim 14 , wherein manipulating the reduction tube positions the vertebra in a desired position.

21. A pedicle screw locking system comprising:
a rod reduction assembly including a pair of grips extending from a housing, the housing having a longitudinal passage therethrough and each grip of the pair of grips having a finger adjacent a distal end thereof configured to engage a receiver of a pedicle screw; and
a locking driver including a locking shaft defining a proximal end and a distal end thereof, the distal end of the locking shaft including a threaded portion and a blunt tip extending from the threaded portion, the locking shaft insertable through the longitudinal passage of the rod reduction device and the threaded portion configured to engage threads on the pedicle screw such that when the threaded portion engages the pedicle screw threads, the blunt tip locks the pedicle screw engaged by the pair of grips.

22. A pedicle screw locking system comprising:
a pedicle screw including a shank, a receiver moveable relative to the shank and configured to receive a spinal rod, and threads configured to receive a set screw to secure a spinal rod within the receiver and lock the pedicle screw such that the shank and the receiver are fixed relative to one another; and
a locking shaft defining a proximal end and a distal end thereof, the distal end of the locking shaft including a threaded portion and a blunt tip extending from the threaded portion, the threaded portion threadably coupled to the threads of the receiver of the pedicle screw, the blunt tip engaging the shank of the pedicle screw to lock the pedicle screw when the threaded portion is threadably coupled to the receiver.

23. A method for locking a pedicle screw comprising:
engaging a receiver of a pedicle screw with fingers of a pair of grips of a reduction device, the reduction device including a longitudinal passage therethrough;
inserting a locking shaft through the longitudinal passage of the reduction device; and
threading a threaded portion of the locking shaft into threads in the receiver of the pedicle screw until a blunt tip of the locking shaft distally extending from the threaded portion engages a portion of the pedicle screw to lock the pedicle screw.

24. A locking driver comprising:
a locking shaft defining a proximal end and a distal end thereof, the distal end of the locking shaft including a th

Assignees

• K2M Inc

Inventors

• Bess Robert Shay
• Schwab Frank
• Dreusicke David
• Choi Theo
• Errico Thomas

Classifications

• A61B17/8894 Primary

  holding the implant into or through which the screw is to be inserted (A61B17/7082, A61B17/7091 take precedence) · CPC title

• A61B17/7086

  Rod reducers, i.e. devices providing a mechanical advantage to allow a user to force a rod into or onto an anchor head other than by means of a rod-to-bone anchor locking element; rod removers · CPC title

• A61B17/708 Primary

  with tubular extensions coaxially mounted on the bone anchors · CPC title