Surgery – Instruments – Orthopedic instrumentation
Reexamination Certificate
2000-03-15
2001-10-30
Hirsch, Paul J. (Department: 3732)
Surgery
Instruments
Orthopedic instrumentation
C606S075000
Reexamination Certificate
active
06309391
ABSTRACT:
This invention relates to orthopedics and spinal surgery, and more particularly relates to a double-hinged bone screw to accommodate the differences in position of adjacent bolts implanted in adjacent vertebrae, which bolts are all mounted to a common spinal rod.
BACKGROUND
Spinal implant systems provide a rod for supporting the spine and properly positioning components of the spine for various treatment purposes. Bolts or screws are typically secured into the vertebrae for connection to a supporting rod. These bolts must frequently be positioned at various angles due to the anatomical structure of the patient, the physiological problem to be treated, and the preference of the physician. It is difficult to provide secure connection between the spinal support rod and these connecting bolts at various angles, and where there are differing distances between the rod and bolts and different heights relative to these components.
SUMMARY OF THE INVENTION
In one aspect, this invention is a bolt for connecting a vertebra to a longitudinal member. The bolt has a mounting portion with a hook or coarse threads to engage a vertebra. The mounting portion is attached to a pivot post in a manner that allows the pivot post to be rotatable about a common axis in respect to the mounting portion of the bolt. The pivot post is then pivotally attached to a connector portion that has machine threads upon which a surgeon may attach other structures.
In another aspect, this invention is an apparatus for maintaining vertebra in a desired relationship. The apparatus has a rod that extends substantially along the spine and one or more bone bolts. At least one of the bone bolt has a mounting portion with a hook or coarse threads to engage a vertebra, and the mounting portion is attached to a pivot post in a manner that allows the pivot post to be rotatable about a common axis in respect to the mounting portion of the bolt. The pivot post of the bone bolt is then pivotally attached to a connector portion of the bone bolt that has machine threads upon which a surgeon attaches a clamp. The clamp, also a part of this embodiment of the invention, has a second bolt and an arm. The second bolt holds the rod and the arm to the clamp. The second bolt has a first channel to hold the rod while the arm has a second channel to hold the bone bolt.
It is an object of this invention to provide a connection assembly that will allow connection between a spinal support rod to a vertebra at a variety of angles relative to the vertical, taken when the patient is lying down.
REFERENCES:
patent: 5002542 (1991-03-01), Frigg
patent: 5196013 (1993-03-01), Harms et al.
patent: 5486174 (1996-01-01), Fournet-Fayard et al.
patent: 5545166 (1996-08-01), Howland
patent: 5569247 (1996-10-01), Morrison
patent: 5591166 (1997-01-01), Bernhardt et al.
patent: 5628740 (1997-05-01), Mullane
patent: 5643263 (1997-07-01), Simonson
patent: 5649926 (1997-07-01), Howland
patent: 5725528 (1998-03-01), Errico et al.
patent: 5743907 (1998-04-01), Asher et al.
patent: 5752957 (1998-05-01), Ralph et al.
patent: 5766254 (1998-06-01), Gelbard
patent: 5800435 (1998-09-01), Errico et al.
patent: 5810819 (1998-09-01), Errico et al.
patent: 5885285 (1999-03-01), Simonson
patent: 5938663 (1999-08-01), Petreto
patent: 5947966 (1999-09-01), Drewry et al.
patent: 5976135 (1999-11-01), Sherman et al.
patent: 5980521 (1999-11-01), Montague et al.
patent: 5989250 (1999-11-01), Wagner et al.
patent: 6017344 (2000-01-01), Errico et al.
patent: 6146383 (2000-11-01), Studer et al.
patent: 6187005 (2001-02-01), Brace et al.
Crandall Dennis
Morrison Matthew M.
Strohkirch Terrance
Bumgarner Melba
Hirsch Paul J.
SDGI Holding, Inc.
Woodard Emhardt Naughton Moriarty & McNett
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