Apparatus for engaging a hook assembly to a spinal column

• US 4,411,259 A
• Filed: 11/24/1981
• Issued: 10/25/1983
• Est. Priority Date: 02/04/1980
• Status: Expired due to Term

• Current Assignee: Denis S. Drummond
• Original Assignee: Denis S. Drummond
• Inventors: Drummond, Denis S.
• Primary Examiner(s): Apley, Richard J.
• Assistant Examiner(s): Wallen, T. J.
• Application Number:
  US06/324,422
• Time in Patent Office: 700 Days
• Field of Search: 128/69, 128/92, 128/303 R, 403/43-47, 403/342, 403/343, 24/263 A
• US Class Current: 606/86.00A
• CPC Class Codes: A61B 17/7002 Longitudinal elements, e.g. rods
• CPC Class Codes: A61B 17/7008 with parts of, or attached to, the longitudinal elements, bearing against an outside of the screw or hook heads, e.g. nuts on threaded rods A61B17/7007 takes precedence
• CPC Class Codes: A61B 17/7032 Screws or hooks with U-shaped head or back through which longitudinal rods pass
• CPC Class Codes: A61B 17/7056 Hooks with specially-designed bone-contacting part
• CPC Class Codes: A61B 17/7076 for driving, positioning or assembling spinal clamps or bone anchors specially adapted for spinal fixation

Abstract

A method and apparatus for use in the treatment of spinal fractures and scoliosis. Windowed hook holders are used to firmly grasp and position hooks having a slotted base and a projecting hook on the spinal column. The projecting hook is used to engage the bone of the spinal column.

Two or more hooks are held firmly in place on the spinal column with the hook holders. A threaded rod carrying two or more sleeves which are slideable along the length of the rod and locking nuts are aligned with the hooks and the sleeves and nuts spaced along the rod to correspond approximately to the spacing of the positioned hooks.

The threaded rod, sleeves and nuts are then passed through the window openings of the hook holders and aligned with the hooks without disengaging the hook holders from the hooks. The threaded rod is then dropped into the slots and the sleeve slid into the hook base to hold the rod in the hook. Opposing openings are located on either side of the base for engagement by the hook holder, to aid in the placement of the hook and to hold the hook before and during interconnection with the threaded rod. Preferably, the hook assembly forms a part of a Harrington compression rod or a tensioning means which interconnects a Harrington distraction rod and a Harrington compression rod. Adjustment of the locking nut locks the hook to the rod.

Claims

1. Apparatus comprising hooks, a rod and a windowed hook holder, said windowed hook holder comprising two shank members operably connected by hinge means, said hinge means providing scissor action between the shank members, said shank members each having first and second ends, the first ends of the shank members forming two opposing jaws for firmly grasping said hooks, said jaws of said hook holder containing two opposing purchasing nubs for engaging mating openings in the sides of said hooks to firmly hold said hooks, the area behind the jaws consisting of an enlarged opening forming a window, said window opening cooperating with said jaws and being of sufficient size to allow passage through the opening of said rod when said jaws are grasping an object, said second ends of said shank members each forming means facilitating grasping of said shank members, each said shank member further including interengageable releasable locking means located between said facilitating means and said hinge means for locking the scissor action of said shank members in a fixed position, so that an object can be firmly held in the jaws without having to maintain pressure on the facilitating means of said shank members.

2. The apparatus of claim 1 wherein the windowed opening in said jaw portion of said shank members is of sufficient size to allow passage of a threaded rod with sleeves and nuts assembled on the rod.

3. The apparatus of claim 1 wherein the windowed opening in the jaw portion of said shank members is of sufficient size to allow passage of a threaded compression rod with assembled parts to pass through the window without opening said hook holder and without disengaging said hook holder from a hook held by the holder.

4. The apparatus of claim 1 wherein the releasable locking means consists of two opposing step-bar members, extending inwardly from the shank members towards each other and in an overlapping relationship.

5. Apparatus comprising hooks, a threaded rod with sleeves and nuts and a windowed hook holder, said windowed hook holder comprising two shank members operably connected by hinge means, said hinge means providing scissor action between the shank members, said shank members each having first and second ends, the first ends of the skank members forming two opposing jaws for firmly grasping hooks, said jaws of said hook holder containing two opposing purchasing nubs for engaging mating openings in the sides of said hooks to firmly hold said hooks, the area behind the jaws consisting of an enlarged opening forming a window, said window opening cooperating with said jaws and being of sufficient size to allow passage through the opening of said threaded rod with sleeves and nuts assembled on the rod when said jaws are grasping a hook, and the second ends of the shank members opposite the jaws form substantially circular openings for holding fingers, further wherein there is disposed proximate said substantially circular openings, releasable locking means consisting of two opposing step-bar members extending inwardly from the shank members toward each other and in an overlapping relationship for releasably locking the scissor action of said shank members in a fixed position, so that an object may be firmly held in the jaws without having to maintain pressure on said substantially circular openings.

6. The apparatus of claim 5 wherein the windowed opening in the jaw portion of said shank members is of sufficient size to allow passage of a threaded compression rod with assembled parts to pass through the window without opening said hook holder and without disengaging said hook holder from a hook held by the holder.