Hook assembly for engaging a spinal column

Details Hook assembly for engaging a spinal column Hook assembly for engaging a spinal column

A - Human Necessities

61

F

128/28

A61F 5/01 (2006.01) A61B 17/70 (2006.01) F16B 7/06 (2006.01)

Patent

CA 1150120

ABSTRACT OF THE DISCLOSURE An apparatus used in the treatment of spinal fractures and scoliosis. A threaded rod carries 2 or more sleeves, each sleeve surrounding a portion of the rod and slidable along the entire length of the rod. Each sleeve engages a hook to inter- connect the rod with the hook. The hook includes a base for en- gaging the sleeve. The base has a bore therethrough which receives the sleeve, and a slot is located parallel to and communicating with the bore. The slot has a width which is greater than the diameter of the rod and less than the outside diameter of the sleeve so that the rod can be placed into the slotted base of the hook and held in position by the sleeve which is slipped over the rod and into the bore. A projecting hook portion is integral- ly connected with the base and is used to engage the bone of the spinal column. A locking system in the form of threaded nuts engages the rod securing the position of the sleeve so that the entire hook assembly may be held in place with respect to the rod. When hooks are faced toward each other on a rod, compression is achieved by advancing the threaded nuts. Likewise, distraction is achieved by reversing the hooks so as to be facing away from each other. The bore in the base may be tapered or may have a smaller portion to prevent the sleeve from sliding completely through the bore. Opposing openings are located on either side of the base for engagement by an instrument, such as a hook holder, to aid in the placement of the hook assembly before inter- connection with the treaded 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.

353350

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