Surgery – Instruments – Orthopedic instrumentation
Reexamination Certificate
2000-03-07
2001-09-04
Smith, Jeffrey A. (Department: 3732)
Surgery
Instruments
Orthopedic instrumentation
C623S017160, C623S902000
Reexamination Certificate
active
06283968
ABSTRACT:
SUMMARY OF THE INVENTION
The invention disclosed herein is a posterior approach laminectomy procedure for placing a prosthesis within the intradiscal space between adjacent vertebrae. The procedure includes the steps of retracting the nerve root and the dural and inserting a disc space spreader within the intradiscal space. The direction of the disc space spreader insertion is recorded and a single tang retractor is inserted within the intradiscal space in a direction substantially parallel to the disc space spreader recorded direction. Further, the steps of forming the surfaces on the adjacent vertebrae to receive the prosthesis and positioning the prosthesis in contact with the formed surfaces using the single tang retractor as a guide are included.
A further aspect of the invention relates to a posterior approach laminectomy procedure for placing a prosthesis into the space between adjacent vertebrae which includes the steps of retracting the dural to an out of the way position and spreading the adjacent vertebrae. A single tang retractor is inserted into the space between the adjacent vertebrae and the direction of insertion of the single tang retractor is recorded. Opposing surfaces on the adjacent vertebrae are formed to receive the prosthesis using the single tang retractor as a guide. The prosthesis is positioned between the opposing surfaces along the single tang insertion direction.
In yet another aspect of the invention a posterior approach laminectomy procedure for placing a split prosthesis having a first half and a second half within the intradiscal space between adjacent vertebrae is disclosed. The halves of the split prosthesis are placed in positions on one side of and an opposite side of the spinal column center line. The procedure includes the steps of retracting the nerve root and dural and inserting a disc space spreader within the intradiscal space on the one side. The direction of the disc space spreader insertion is recorded and a single tang retractor is inserted within the intradiscal space on the opposite side in a direction substantially parallel to the disc space spreader recorded direction. Surfaces on the adjacent vertebrae are formed on the opposite side to receive the prosthesis second half The prosthesis second half is positioned in contact with the formed surfaces on the opposite side using the single tang retractor as a guide. The single tang retractor is removed from the opposite side and the disc space spreader is removed from the one side. The single tang retractor is inserted within the intradiscal space on the one side in the position vacated by the disc space spreader and substantially parallel with the disc space spreader recorded direction. The surfaces on the adjacent vertebrae on the one side are formed to receive the prosthesis first half. The prosthesis first half is positioned in contact with the formed surfaces on the one side using the single tang retractor as a guide. Thereafter, the single tang retractor is removed from the one side.
REFERENCES:
patent: 3848601 (1974-11-01), Ma et al.
patent: 4545374 (1985-10-01), Jacobson
patent: 5803904 (1998-09-01), Mehdizadeh
patent: 5961522 (1999-10-01), Mehdizadeh
patent: 6030390 (2000-02-01), Mehdizadeh
Robert Eduardo C.
Smith Jeffrey A.
Stanley Henry M.
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