Systems and methods for performing spinal surgery

• US 20170143426A1
• Filed: 03/12/2013
• Published: 05/25/2017
• Est. Priority Date: 03/12/2012
• Status: Active Grant

• Current Assignee: Nuvasive Incorporated
• Original Assignee: Nuvasive Incorporated
• Inventors: Isaacs, Robert E., Finley, Eric, Scholl, Thomas, Barnes, Jeff
• Granted Patent: US 11,207,132 B2
• Time in Patent Office: Days
• CPC Class Codes: A61B 17/7011 Longitudinal element being non-straight, e.g. curved, angled or branched adjustable length longitudinal elements A61B17/7014; A61B17/7019 takes precedence, e.g. coil springs
• CPC Class Codes: A61B 17/8863 Apparatus for shaping or cutting osteosynthesis equipment by medical personnel
• CPC Class Codes: A61B 2034/108 Computer aided selection or customisation of medical implants or cutting guides
• CPC Class Codes: A61B 2034/2055 Optical tracking systems
• CPC Class Codes: A61B 2090/3983 Reference marker arrangements for use with image guided surgery
• CPC Class Codes: A61B 34/10 Computer-aided planning, simulation or modelling of surgical operations
• CPC Class Codes: A61B 34/20 Surgical navigation systems; Devices for tracking or guiding surgical instruments, e.g. for frameless stereotaxis
• CPC Class Codes: A61B 90/39 Markers, e.g. radio-opaque or breast lesions markers
• CPC Class Codes: G16H 20/40 relating to mechanical, radiation or invasive therapies, e.g. surgery, laser therapy, dialysis or acupuncture
• CPC Class Codes: G16H 30/40 for processing medical images, e.g. editing
• CPC Class Codes: G16H 50/50 for simulation or modelling of medical disorders

Abstract

A method is provided for correcting a curvature or deformity in a patient'"'"'s spine based on the digitized locations of implanted screws. 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 the spine of a patient during a spinal surgical procedure, said method comprising the steps of:

(a) placing a digitizer within a screw head associated with each of a plurality of implanted screws, said digitizer communicatively linked to a processing system;

(b) digitizing spatial position information associated with the locations of each of the plurality of implanted screws such that the spatial position information associated with each of the implanted screws is received by said processing system;

(c) developing a bend curve function to approximate the location of each of the plurality of implanted screws;

(d) placing at least one non-digitized point at a location selected by a user;

(d) applying at least one correction input to the bend curve function based on a desired surgical correction, wherein the at least correction input comprises at least one of at least one of a coronal, sagittal, and global alignment correction, wherein the at least one correction input comprises at least one digitized screw locations and at least one non-digitized point;

(e) generating a revised bend curve based on the at least one applied correction input wherein said revised bend curve includes an offset indicator indicative of the relative position between the implanted screw location and a revised screw location based on the at least one correction input; and

(f) generating bend instructions to approximate the revised bend curve, said bend instructions to be performed on the rod by a bending tool.

2. The method of claim 1, wherein the spatial position information associated with each of the implanted screws is averaged using a mean calculation.

3. The method of claim 1, wherein the non-digitized screw point location is an adjusted distance from the digitized screw location.

4. The method of claim 3, wherein a color depicts the adjusted distance.

5. The method of claim 3, wherein the adjusted distance is limited by a maximum distance.

6. The method of claim 1, wherein the non-digitized screw point location is between a superior-most digitized screw location and an inferior-most digitized screw location.

7. The method of claim 1, wherein the bend instructions are for a pre-bent rod.

8. The method of claim 1, wherein the bend instructions incorporate an addition or subtraction of lordosis or kyphosis.

9. The method of claim 1, further comprising measuring superior and inferior lumbar lordosis angles, and adjusting the angles based on a lateral radiographic image of the patient.

10. A method for correcting the curvature of the spine of a patient during a spinal surgical procedure, said method comprising the steps of:

sensing a plurality of implanted screws;

creating digitized spatial position information associated with locations of said plurality of implanted screws;

receiving said spatial position information by said processing system;

developing a bend curve that is dependent on digitized screw locations and non-digitized point locations, wherein the non-digitized point locations are user selected independently of a curve fitting algorithm; and

generating bend instructions to approximate said bend curve, said bend instructions to be performed on a rod by a bending tool.

12. The method of claim 10, wherein at least one of the non-digitized point location is in one of a sagittal plane and a coronal plane.

13. The method of claim 12, further comprising increasing or decreasing a desired angle correction of the spine in a sagittal plane.

14. The method of claim 12, further comprising measuring an amount of lordosis in the spine and adjusting angles in a sagittal plane.

15. The method of claim 10, further comprising altering the bend curve into a natural shape.

16. The method of claim 10, further comprising altering the bend curve to have a smoother bend.

17. The method of claim 10, further comprising correcting the spine to a shape of the rod.

18. The method of claim 10, wherein the bend instructions is a pre-bent rod solution if the digitized screw locations are within a curve fitting tolerance.

11. (canceled)