Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Implantable prosthesis – Bone
Patent
1995-02-08
1997-03-11
Isabella, David
Prosthesis (i.e., artificial body members), parts thereof, or ai
Implantable prosthesis
Bone
606 61, A61F 244, A61B 1756
Patent
active
056096348
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an intervertebral prosthesis.
BACKGROUND OF THE INVENTION
Various types of intervertebral retention prostheses have previously been made, either rigid or flexible, the function of which is to eliminate lumbar vertebral frontal and sagittal rotatory instability. The rigid prostheses comprise plates, rods with hooks, and the flexible prostheses are formed by ligaments associated with rigid or flexible blocks.
However, these known ligamentary systems do not make it possible to stabilize flexion/extension and rotation in a satisfactory manner.
OBJECT OF THE INVENTION
The aim of the invention is therefore to produce an intervertebral prosthesis of the ligamentary type, arranged so as to be capable of stabilizing flexion/extension and rotation in an entirely satisfactory manner.
SUMMARY OF THE INVENTION
According to the invention, the intervertebral prosthesis comprises: small thickness, and a second, wide part in continuation of the first, of greater width and thickness than the first part, the first part being intended to make possible lacing in a figure of eight around the spinous processes of two adjacent vertebrae, while the second part is adapted to carry out a perispinous encircling, ducts of different section are cut, which are adapted for passage of the two respective parts of the ligament,
According to an advantageous embodiment of the invention, the two ducts for passage of the thin part are juxtaposed in the central part of the block and intercommunicate via a central opening which makes it possible to cross two strands of the thin part of the ligament.
The prosthesis according to the invention therefore makes it possible to carry out simultaneously stabilization of the vertebrae in flexion/extension by virtue of the perispinous encircling of the wide part of the ligament and stabilization in rotation by virtue of oblique passage between the spinous processes of the thin part of the ligament.
The latter can be made of an appropriate material, for example polyester or the material known under the trade mark "DACRON" (polyethylene terephthalate), made of a braiding in different directions.
BRIEF DESCRIPTION OF THE DRAWINGS
Other features and advantages of the invention will appear in the course of the descripition which follows and is given with reference to the attached drawing which illustrates en embodiment thereof by way of non-limiting example.
FIG. 1 is a view in perspective of an embodiment of the ligament of the intervertebral prosthesis according to the invention.
FIGS. 2 and 3 are views in partial perspective of lengths of the thin and wide parts respectively of the ligament in FIG. 1, showing the difference in section.
FIG. 4 is a view in perspective of an embodiment of the block of the prosthesis according to the invention.
FIG. 5 is a view from above of the block in FIG. 4.
FIG. 6 is a view in perspective of the block at a different angle to that in FIG. 4.
FIG. 7 is a view in perspective of the intervertebral prosthesis in FIGS. 1 to 6 in the course of mounting on the spinous processes of two adjacent lumbar vertebrae.
FIG. 8 is a view in perspective similar to FIG. 7, showing the mounting of the prosthesis when completed.
FIG. 9 is a view in rear elevation of the lumbar vertebrae provided with the intervertebral prosthesis in FIG. 8.
DETAILED DESCRIPTION OF THE INVENTION
The prosthesis to which the invention relates comprises a flexible ligament 1 consisting of two parts: a first, thin part 2, of small width and of small thickness, and a second, wide part 3, in continuation of the first part 2, of greater width and thickness than the part 2. By way of non-limiting indicative numerical example, the width 11 (FIG. 2) of the thin part 1 may be 4 mm and its thickness el 1 mm, while the width 12 of the wide part 3 may be 8 mm, its thickness e2 being 2 mm.
The ends of the two parts 2, 3 are extended by threads 4, 5 intended to make possible passage of the ligament 1. The ligament is sewn on itself via four or five points i
REFERENCES:
patent: 4643178 (1987-02-01), Nastari et al.
patent: 4728329 (1988-03-01), Mansat
patent: 4795466 (1989-01-01), Stuhmer et al.
patent: 4917700 (1990-04-01), Aikins
patent: 5011484 (1991-04-01), Breard
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