Multi-axial bone screw assembly

Details Multi-axial bone screw assembly Multi-axial bone screw assembly

A - Human Necessities

61

B

A61B 17/68 (2006.01) A61B 17/86 (2006.01)

Patent

CA 2382033

A bottom-loading multi-axial bone anchor apparatus is disclosed. The apparatus includes a receiver member (30), a crown member (70), a bone anchor (50) and a retaining member (90). The receiver member (30) defines an upper opening (31a) and a lower opening (31b), which may form part of the same opening (32), a channel (45), and a grove (41). The crown member (70) and bone anchor (50) are loaded into the lower opening (31b) of the receiver member (30), and the retaining member (90) fits around the bone anchor (50) and into the groove (41) in the receiver member (30). The bone anchor (50) is capable of multi-axial positioning with respect to the receiver member (30). An elongated member (R) is placed in the channel (45) of the receiver member (30), contacting the crown member (70), and a compression member (120) is applied via the upper opening (31a). The compression member (120) presses down on the elongated member (R), which presses down on the crown member (70) and locks the bone anchor (50) between the crown member (70) and the retaining member (30).

L'invention concerne un appareil d'ancrage multiaxial de l'os à chargement par le bas, qui comprend un logement (30), une bague (70), un ancrage d'os (50) et un élément de retenue (90). Le logement (30) définit une ouverture supérieure (31a) et une ouverture inférieure (31b), qui peuvent former une partie de la même ouverture (32), un canal (45) et une rainure (41). La bague (70) et l'ancrage d'os (50) sont chargés par l'ouverture inférieure (31b) du logement (30), l'élément de retenue (90) épousant l'ancrage d'os (50) et se logeant dans la rainure (41) à l'intérieur du logement (30). L'ancrage d'os (50) peut se placer de façon multiaxiale par rapport au logement (30). Un élément allongé (R) est placé dans le canal (45) du logement (30) en contact avec la bague (70), et un élément de compression (120), appliqué par le biais de l'ouverture supérieure (31a), appuie sur l'élément allongé (R), lequel presse la bague (70) et verrouille l'ancrage d'os (50) entre la bague et l'élément de retenue (90).

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