Zero profile small stature pedicle screw assembly and associated method of use

Patent metadata

Field	Value
Publication number	US-2025000551-A1
Application number	US-202318342097-A
Country	US
Kind code	A1
Filing date	Jun 27, 2023
Priority date	Jun 27, 2023
Publication date	Jan 2, 2025
Grant date	—

Abstract

A pedicle screw assembly that includes at least one head fixation assembly having an upper body and a lower body with an opening in a bottom portion of the lower body, at least one bone screw positioned between the upper body and the lower body of the head fixation assembly and extends outward from the opening in the bottom portion of the lower body, at least one lateral interconnecting member to stabilize at least one bone in a patient, wherein the at least one head fixation assembly is transversely attached to the at least one lateral interconnecting member; and a securing mechanism to lock the upper body to the lower body to prevent polyaxial motion and translation along the at least one interconnecting member. The interconnecting member can be at least one plate, a c-shaped member, or a walled member with slots. Navigatable screwdriver instruments can be utilized.

First claim

What is claimed is:

1 . A pedicle screw assembly, comprising:
at least one head fixation assembly having an upper body and a lower body with an opening in a bottom portion of the lower body; at least one bone screw positioned between the upper body and the lower body of the head fixation assembly that extends outward from the opening in the bottom portion of the lower body; at least one lateral interconnecting member to stabilize at least one bone in a patient, wherein the at least one head fixation assembly is transversely attached to the at least one lateral interconnecting member; and at least one securing mechanism to lock the upper body to the lower body to prevent polyaxial motion and translation along the at least one interconnecting member.

2 . The pedicle screw assembly according to claim 1 , wherein the at least one lateral interconnecting member is a lateral plate.

3 . The pedicle screw assembly according to claim 2 , wherein the upper body of the head fixation assembly includes an upward extending prong that interconnects into a downward facing upper groove in the lateral plate, and the lower body of the head fixation assembly includes a downward extending prong that interconnects into an upward facing lower groove in the lateral plate.

4 . The pedicle screw assembly according to claim 1 , further comprising a modular clip that secures the bone screw within the lower body of the head fixation assembly.

5 . The pedicle screw assembly according to claim 1 , wherein the securing mechanism includes a locking bolt that connects the upper body to the lower body of the head fixation assembly.

6 . The pedicle screw assembly according to claim 1 , wherein the at least one interconnecting member includes both a first plate and a second plate positioned in parallel on each side of the head fixation assembly with the upper body of the head fixation assembly includes an upward extending prong that interconnects into a downward facing upper groove in the first lateral plate and a downward facing upper groove in the second lateral plate and the lower body of the head fixation assembly includes a downward extending prong that interconnects into an upward facing lower groove in the first lateral plate and an upwardly facing lower groove in the second lateral plate.

7 . The pedicle screw assembly according to claim 6 , wherein the securing mechanism includes a locking screw that engages the upper body of the head fixation assembly.

8 . The pedicle screw assembly according to claim 1 , wherein the at least one interconnecting member having a cylindrical opening and the upper body of the head fixation assembly includes an upper half circle dovetail prong that interconnects into the cylindrical opening of the interconnecting member and the lower body of the head fixation assembly includes a lower half circle dovetail prong that interconnects into the cylindrical opening of the interconnecting member and allows angulation of the interconnecting member.

9 . The pedicle screw assembly according to claim 8 , wherein the interconnecting member is c shaped.

10 . A method of installing a pedicle screw assembly, the method comprising:
at least partially inserting the at least one bone screw into a bone of the patient with the at least one screw extender instrument; attaching a head fixation assembly to the at least one screwdriver instrument and inserting the head fixation assembly over the at least one bone screw; attaching at least one lateral interconnecting member to the head fixation assembly; further reducing the at least one bone screw into the head fixation assembly with the at least one screwdriver instrument; and connecting a securing mechanism to lock an upper body of the head fixation assembly to the lower body of the head fixation assembly to prevent polyaxial motion and translation along the at least one interconnecting member.

11 . The method of installing a pedicle screw assembly according to claim 10 , wherein the at least one lateral interconnecting member is a lateral plate, and the upper body of the head fixation assembly includes an upward extending prong that interconnects into a downward-facing upper groove in the lateral plate, and the lower body of the head fixation assembly includes a downward extending prong that interconnects into an upward facing lower groove in the lateral plate.

12 . The method of installing a pedicle screw assembly according to claim 10 , wherein the at least one interconnecting member includes both a first plate and a second plate positioned in parallel on each side of the head fixation assembly with the upper body of the head fixation assembly includes an upward extending prong that interconnects into a downward facing upper groove in the first lateral plate and a downward facing upper groove in the second lateral plate and the lower body of the head fixation assembly includes a downward extending prong that interconnects into an upward facing lower groove in the first lateral plate and an upwardly facing lower groove in the second lateral plate.

13 . The method of installing a pedicle screw assembly according to claim 10 , wherein the at least one lateral interconnecting member having a cylindrical opening and the upper body of the head fixation assembly includes an upper half circle dovetail prong that interconnects into the cylindrical opening of the lateral interconnecting member and the lower body of the head fixation assembly includes a lower half circle dovetail prong that interconnects into the cylindrical opening of the lateral interconnecting member and allows angulation of the lateral interconnecting member.

14 . The method of installing a pedicle screw assembly according to claim 10 , wherein the at least one bone screw that includes both a first bone screw and a second bone screw, and the at least one screw extender instrument that includes both a first navigatable screwdriver instrument and a second navigatable screwdriver instrument, wherein each navigatable screwdriver instrument includes a two marker array with fiducial markers aligned along a central axis of the applicable bone screw for navigated and/or robotic screw placement, wherein once the first and second bone screws have been placed, the first and second screwdriver instruments continue to track the location and orientation of a patient's bone using the location and orientation of the placed first and second bone screws.

15 . The method of installing a pedicle screw assembly according to claim 14 , wherein at least one of the first and second navigatable screwdriver instruments function as a local dynamic reference base, thereby improving navigation integrity.

16 . The method of installing a pedicle screw assembly according to claim 14 , the orientation of the central axes of the bone screws and first and second navigatable screwdriver instruments are recorded at an initial position with vectors defining the central axes of the navigatable screw extender instruments are then calculated.

17 . The method of installing a pedicle screw assembly according to claim 14 , wherein the orientation and position of the central axes of the first and second bone screws are recorded at an initial position with locations of the fiducial markers modeled by calculating their distance along the central axes of the first and second screw extenders defining an array to be tracked and recognized

18 . A pedicle screw assembly, comprising:
a plate having upwardly extending walls and at least one slot; and a plurality of bone screws, each havin

Assignees

• Globus Medical Inc

Inventors

• Leff David

Classifications

• A61B2090/3983

  Reference marker arrangements for use with image guided surgery · CPC title

• A61B2034/2055

  Optical tracking systems · CPC title

• A61B17/7004 Primary

  with a cross-section which varies along its length (A61B17/7019 takes precedence) · CPC title

• A61B17/7037

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

• A61B17/7007

  Parts of the longitudinal elements, e.g. their ends, being specially adapted to fit around the screw or hook heads · CPC title