Systems and methods for performing spine surgery

• US 9,848,922 B2
• Filed: 10/09/2014
• Issued: 12/26/2017
• Est. Priority Date: 10/09/2013
• Status: Active Grant

• Current Assignee: Nuvasive Incorporated
• Original Assignee: Nuvasive Incorporated
• Inventors: Tohmeh, Antoine G., Scholl, Thomas
• Primary Examiner(s): Merene, Jan Christopher
• Assistant Examiner(s): COTRONEO, STEVEN J
• Application Number:
  US14/511,038
• Publication Number:
  US 20150100091A1
• Time in Patent Office: 1,174 Days
• CPC Class Codes: A61B 17/7083 Tools for guidance or insertion of tethers, rod-to-anchor connectors, rod-to-rod connectors, or longitudinal elements
• CPC Class Codes: A61B 17/7086 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 Class Codes: A61B 17/808 Instruments for holding or positioning bone plates, or for adjusting screw-to-plate locking mechanisms
• CPC Class Codes: A61B 17/8863 Apparatus for shaping or cutting osteosynthesis equipment by medical personnel
• CPC Class Codes: A61B 2034/2055 Optical tracking systems
• CPC Class Codes: A61B 2034/254 being adapted depending on the stage of the surgical procedure
• CPC Class Codes: A61B 2090/3983 Reference marker arrangements for use with image guided surgery
• CPC Class Codes: A61B 34/25 User interfaces for surgical systems

Abstract

A method is provided for correcting a curvature or deformity in a patient'"'"'s spine based on the digitized locations of implanted screws and tracking the placement of the rod as it is placed in a minimally invasive fashion. The method is implemented by a control unit through a GUI to digitize screw locations, accept one or more correction outputs, and generate one or more rod solution outputs shaped to fit at locations distinct from the implanted screw locations.

Claims

1. A method for correcting the curvature of a spine of a patient, comprising the steps of:

implanting a plurality of bone screws at various locations along a spine, each of the plurality of bone screws having an anchor portion and a rod housing, the anchor portion adapted to provide purchase within bone and the rod housing configured to receive at least a portion of a spinal rod therein;

digitizing the locations of said plurality of implanted screws using a digitizing pointer comprised of a housing having shutters manually operable between an open position and a closed position, whereby said shutters expose reflective markers attached to said housing in the open position upon squeezing a handle of said housing, and whereby a digitizing pointer sensor detects said locations of said plurality of implanted screws when the shutters are in the open position;

digitizing a distal end of a spinal rod attached to a rod inserter that enables the spinal rod to advance through an operative corridor;

seating, with a rod pusher, the spinal rod in at least one of said rod housings;

wherein at least one of the rod inserter and the rod pusher has an emitting component thereon that can be sensed by a sensor;

continuously generating a dynamic visual output on a graphic user interface corresponding to the relative locations of the digitized screws and the digitized distal end; and

advancing the distal end of the spinal rod through the operative corridor toward a first of the implanted screws while receiving the dynamic visual output on the graphic user interface.

2. The method of claim 1, wherein each implanted screw has an extension guide removeably attached to the rod housing, the extension guide adapted to transiently receive at least a portion of the spinal rod therein, the extension guide further adapted to receive at least a portion of the rod pusher.

3. The method of claim 2, wherein the rod pusher is adapted to mate with the extension guide, the rod pusher having at least one rod engaging surface adapted to contact the spinal rod.

4. The method of claim 3, further comprising the step of calibrating a distal end of the rod pusher with the distal end of the spinal rod.

5. The method of claim 4, further comprising the step of advancing the rod pusher along the extension guide until the at least one rod engaging surface is positioned near the rod housing.

6. The method of claim 5, further comprising the step of advancing the distal end of the spinal rod through the extension guide removeably attached to the first implanted bone screw.

7. The method of claim 6, further comprising the step of advancing a second rod pusher along a second extension guide, the second extension guide removeably attached to a second implanted bone screw.

8. The method of claim 7, further comprising the step of advancing the distal end of the spinal rod toward the second extension guide removeably attached to the second implanted bone screw.

9. The method of claim 8, further comprising the step of advancing the distal end of the spinal rod through the second extension guide removeably attached to the second implanted bone screw.

10. The method of claim 9, further comprising the steps of:

advancing the first rod pusher along the first extension guide until the at least one rod engaging surface contacts the portion of the spinal rod present within the rod housing;

securing the spinal rod within the first rod housing;

advancing the second rod pusher along the second extension guide until the at least one rod engaging surface contacts the portion of the spinal rod present within the second rod housing; and

securing the spinal rod within the second rod housing.