Fixing instrument for spinal fusion members

Details Fixing instrument for spinal fusion members Fixing instrument for spinal fusion members

1994-12-27

1996-10-29

Buiz, Michael Powell

Surgery

Instruments

Orthopedic instrumentation

606 69, A61B 1770, A61B 1780

Patent

active

055692460

ABSTRACT:
Two posterior spinal fusion members are secured to a plurality of vertebrae which constitute a spine. The posterior spinal fusion members are fixed to both sides of the spinous processes of the vertebrae. A fixing instrument is attached to each posterior spinal fusion member. The fixing instrument includes a rod-shaped connecting member and two hooks slidably attached to both ends of the connecting member. Elongated holes are formed in the portions of the connecting member where the hooks are attached. Male screws are driven through the elongated holes. The surface around the opening of each elongated hole where the head of the associated male screw slides is formed as the bottom of a recess which is shallow on the associated end side of the fixing instrument and is deep on the connecting member side. When a hexagonal wrench is inserted in a hexagonal hole formed in the end face of the head of this male screw and is manipulated to drive the male screw into the associated hook, the head of the male screw slides on the bottom of this recess, causing the hook to move toward the connecting member. Therefore, force is applied to the two posterior spinal fusion members to shift the posterior spinal fusion members toward each other.

REFERENCES:
patent: 5084049 (1992-01-01), Asher et al.
patent: 5147361 (1992-09-01), Ojima et al.
patent: 5176680 (1993-01-01), Vignaud et al.
patent: 5334203 (1994-08-01), Wagner
patent: 5391168 (1995-02-01), Sanders et al.
Stuart Spine Division Product Brochure entitled "Instruments for Proper Implantation," dated Nov. 1992.
Dir Co. Ltd. Product Brochure entitled "Spinal Fixation Diapason," published by Dismo Innovation Research in English and Japanese.

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