Prosthetic nucleus replacement for surgical reconstruction of in

Details Prosthetic nucleus replacement for surgical reconstruction of in Prosthetic nucleus replacement for surgical reconstruction of in

1999-01-25

2000-11-14

Millio, V.

Prosthesis (i.e., artificial body members), parts thereof, or ai

Implantable prosthesis

Bone

623 1711, A61F 244

Patent

active

061464228

ABSTRACT:
A prosthetic nucleus replacement comprises a solid flattened oval disk. The top surface of the disc is domed and has a crest that is about three times higher than the crest on the domed bottom surface. Both top and bottom surfaces are therefore convex. A peg extends down from the middle of the bottom domed surface and is used to pin the disc to the lower of two vertebrae it fits between. Metal markers are inserted into the peg and an outside edge of the disc so that radiographs can be used to determine the disc's in situ position. The prosthetic nucleus replacement is surgically implanted into the hollowed out intervertebral space through a flap cut in the natural annulus fibrosis. The lower vertebrae is prepared to receive the peg by clearing the material covering the top of the bone matrix. Bone cement is used around the peg to ensure a tight fit and immobile attachment of the disc to the lower vertebrae.

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Casey K. Lee, et al, "Prosthetic Intervertebral Disc," Chapter 96, pp. 2007-2014, The Adult Spine: Principles and Practice: Raven Press, Ltd., New York, 1991.

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