Spinal prostheses

Details Spinal prostheses Spinal prostheses

A - Human Necessities

61

F

A61F 2/44 (2006.01)

Patent

CA 2587624

A spinal prosthesis has a prosthetic vertebral body in the form of a hollow cylinder (1) with perforated wall and attached prosthetic intervertebral discs formed by springs (7, 8) moulded into silicone-rubber beads (9, 10). Anchoring of the cylinder (1) to the damaged vertebra (II) is by means of entrapment of an elongate lug (12) of the cylinder 1 within a slot (16) of a plate (11) retained by screws (12) within a recess (13) of the damaged vertebra (II). The springs (7, 8) of the resilient beads (9, 10) are attached to the natural vertebrae (I, III) superior and inferior to the damaged vertebra (II) by fixing plates (3, 4) which have flanges (20, 21) that are held by screws (22) to those vertebrae (I, III). Where adjoining vertebrae are damaged, two or more prosthetic cylinder (1) for anchoring to the individual vertebra are used with interconnecting resilient beads (9, 10).

L~invention concerne une prothèse rachidienne comportant un corps vertébral de prothèse revêtant la forme d~un cylindre creux (1) dont la paroi est perforée et des disques intervertébraux de prothèse fixés formés par des ressorts (7, 8) moulés dans des billes en caoutchouc de silicone (9, 10). L~ancrage du cylindre (1) à la vertèbre endommagée (II) est effectué par blocage d~une saillie allongée (12) du cylindre 1 dans une fente (16) d~une plaque (11) retenue par des vis (12) dans un évidement (13) de la vertèbre endommagée (II). Les ressorts (7, 8) des billes résilientes (9, 10) sont fixés aux vertèbres naturelles (I, III) situées au-dessus et en dessous de la vertèbre endommagée (II) par des plaques de fixation (3, 4) comportant des brides (20, 21) maintenues par des vis (22) à ces vertèbres (I, III). Lorsque des vertèbres adjacentes sont endommagées, on utilise deux cylindres de prothèse (1) ou plus pour l~ancrage à la vertèbre individuelle, ainsi que des billes résilientes d~interconnexion (9, 10).

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