Granted Patent
B2
US 12,544,117 · App. 18/298,509 · Granted Feb 10, 2026
Screw tower and rod reduction tool
Inventors:
Matthew Bechtel (Philadelphia, PA); Caelan Allen (Ambler, PA); Neil R. Crawford (Chandler, AZ); Thomas Calloway (Pelham, NH); Steven Chang (Phoenix, AZ); Norbert Johnson (North Andover, MA); Jeffrey Forsyth (Cranston, RI)
Assignee:
Globus Medical, Inc.
A61B17/708A61B17/7082A61B17/7083A61B17/7085A61B17/7086A61B17/7091A61B2017/00477A61B34/20A61B2034/2055A61B2034/2065
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Abstract
A system includes a screw tower, an instrument, and a housing. The instrument includes a driver shaft extendable longitudinally through the screw tower, and a threaded sleeve mounted on a proximal portion of the driver shaft. The housing includes one or more retention members coupleable to the screw tower, and a threaded button threadably coupleable to the threaded sleeve. The threaded sleeve is rotatable about a longitudinal axis to urge the driver shaft longitudinally relative to the screw tower.
Claims (33)
1 . A tracking system for tracking bone screw towers configured to be attached to vertebral bodies during a minimally invasive surgical procedure, the system comprising:
a first screw tower adapted to be attached to a pedicle screw attached to a vertebral body of a patient, the first screw tower having a plurality of spaced stripes in a selected pattern;
a second screw tower having a plurality of spaced stripes and adapted to be attached to a second pedicle screw attached to the same vertebral body as the first pedicle screw;
a processor; and
a plurality of position sensors in communication with the processor and including a plurality of stereo-photogrammetric cameras;
wherein the processor is configured to determine a 3D pose of the spaced stripes on the first screw tower from camera images obtained from the stereo-photogrammetric cameras based on a stereo-photogrammetry process,
wherein the processor is configured to determine a 3D pose of the spaced stripes on the second screw tower based on images obtained from the stereo-photogrammetric cameras based on stereo-photogrammetry, and
wherein the plurality of spaced stripes on the first screw tower is spaced apart differently than the plurality of spaced stripes on the second screw tower to allow the processor to distinguish between the first and second screw tower based on the spaced stripes of the first and second screw tower.
2 . The system of claim 1 , wherein the processor is configured to transfer registration to the spaced stripes on the first screw tower for use as a dynamic reference base.
3 . The system of claim 1 , wherein the spaced stripes of the first screw tower include a plurality of parallel stripes.
4 . The system of claim 1 , wherein the processor determines the 3 D pose of the spaced stripes of the first screw tower by comparing an image from the position sensor to a geometrical model of the stripes.
5 . The system of claim 1 , wherein the spaced stripes of the first screw tower include:
a first set of stripes;
a second set of stripes longitudinally spaced from the first set.
6 . The system of claim 5 , wherein the spaced stripes of the first screw tower further include a single stripe disposed between the first and second sets of stripes.
7 . The system of claim 5 , wherein a thickness of at least one of the spaced stripes in the first screw tower is different from at least one of the spaced stripes in the second screw tower.
8 . The system of claim 1 , wherein the spaced stripes of the first and second screw towers are retro-reflective detectable by the position sensors.
9 . A tracking system for tracking bone screw towers configured to be attached to vertebral bodies during a minimally invasive surgical procedure, the system comprising:
a first screw tower adapted to be attached to a pedicle screw attached to a vertebral body of a patient, the first screw tower having a cylindrical body and a plurality of spaced stripes in a selected pattern on the cylindrical body, the cylindrical body having a pair of longitudinal recesses for receiving a rod to be fixed to the pedicle screw;
a second screw tower having a plurality of spaced stripes and adapted to be attached to a second pedicle screw attached to the same vertebral body as the first pedicle screw;
a processor;
a plurality of position sensors in communication with the processor and including a plurality of stereo-photogrammetric cameras;
wherein the processor is configured to determine a center of the spaced stripes on the first screw tower from camera images obtained from the stereo-photogrammetric cameras based on a stereo-photogrammetry process, and
wherein the plurality of spaced stripes on the first screw tower is spaced apart differently than the plurality of spaced stripes on the second screw tower to allow the processor to distinguish between the first and second screw tower based on the spaced stripes of the first and second screw tower.
10 . The system of claim 9 , wherein the processor is configured to transfer registration to the spaced stripes on the first screw tower for use as a dynamic reference base.
11 . The system of claim 9 , wherein the spaced stripes of the first screw tower include a plurality of parallel stripes.
12 . The system of claim 9 , wherein the processor determines the 3 D pose of the spaced stripes of the first screw tower by comparing an image from the position sensor to a geometrical model of the stripes.
13 . The system of claim 9 , wherein the spaced stripes of the first screw tower include:
a first set of stripes;
a second set of stripes longitudinally spaced from the first set.
14 . The system of claim 13 , wherein the spaced stripes of the first screw tower further include a single stripe disposed between the first and second sets of stripes.
15 . The system of claim 13 , wherein a thickness of at least one of the spaced stripes in the first screw tower is different from at least one of the spaced stripes in the second screw tower.
16 . The system of claim 9 , wherein the spaced stripes of the first and second screw towers are retro-reflective detectable by the position sensors.
Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST
Recorded Apr 11, 2023
From: BECHTEL, MATTHEW; ALLEN, CAELAN; CRAWFORD, NEIL R.; CALLOWAY, THOMAS; CHANG, STEVEN, DR.; JOHNSON, NORBERT; FORSYTH, JEFFREY
To: GLOBUS MEDICAL, INC.
Reel/Frame 063286/0855 →
Continuity (3)
Continuation
17382782
· Jul 22, 2021
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