Spinal instruments, particularly for a rod

Details Spinal instruments, particularly for a rod Spinal instruments, particularly for a rod

A - Human Necessities

61

B

A61B 17/70 (2006.01)

Patent

CA 2215485

Spinal instruments, particularly for an adjustable connecting rod, including a bone anchor element (1) with an anchoring portion (2) separated from a projecting threaded head (3) engaging a nut (5) by an intermediate body (4) having a polygonal cross-section (19) and forming an abutment (7) in the upper portion thereof, and an assembly (8) for receiving and locking a connecting head. Said receiving and locking assembly consists of a clamping element with two arms joined together at a connecting region and provided with facing apertures (17, 18) through which the threaded head can be inserted as far as the abutment (7), a recess being defined between the arms of the clamp. Said assembly further consists of a compressible ring (24) housed in the recess and provided with a central channel for receiving the connecting rod, whereby the recess and the ring together form a ball joint so that clamping the two arms using the nut engaging the threaded head locks the ring and the connecting rod in a desired angular position.

L'invention concerne une instrumentation rachidienne notamment pour tige d'union orientale, comprenant un élément d'ancrage osseux (1), ledit élément comportant une partie d'ancrage (2) séparée d'une tête filetée saillante (3), associée à un écrou (5), par un corps intermédiaire (4) de section polygonale (19) formant butée (7) en sa partie supérieure, et un ensemble (8) de réception--blocage d'une tête d'union. Ledit ensemble de réception-blocage est formé: d'un élément formant pince, comprenant deux branches réunies par une zone de liaison, les branches étant pourvues d'orifices (17, 18) en vis-à-vis, au travers desquels peut être engagée la tête filetée jusqu'à la butée (7), et la pince délimitant entre les branches une cavité; une bague compressible (24) logée dans la cavité et munie d'un passage central pour recevoir la tige d'union, l'ensemble cavité-bague formant un montage à rotule, de sorte que le serrage des deux branches au moyen de l'écrou engagé sur la tête filetée provoque le blocage de la bague et de la tige d'union dans la position angulaire souhaitée.

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