Anterior cervical plate and fixation system

Details Anterior cervical plate and fixation system Anterior cervical plate and fixation system

A - Human Necessities

61

B

A61B 17/68 (2006.01) A61B 17/70 (2006.01) A61B 17/88 (2006.01) A61B 17/80 (2006.01)

Patent

CA 2349544

An anterior cervical plate (22) is disclosed, along with threaded fasteners (24a-24d) for securing the plate to vertebrae (18, 20) or other osseous material. The cervical plate (22) has several pockets or apertures (30a-30d), preferably at least four, to receive a corresponding number of the fasteners (24a-24d). The pockets have spherical surfaces (34), and the fasteners have heads with similarly sized spherical surfaces (48), which when engaged permit each of the fasteners to be oriented at a variety of projection angles with respect to the plate (22). In connection with each pocket (30a-30d), the cervical plate (22) incorporates a fastener retaining feature (40). The feature can take the form of a cantilevered tab or a beam supported at its opposite ends, in each case plastically deformable between an open position for admitting the fastener and a closed position for preventing retraction.

Plaque antérieure cervicale (22) et fixations filetés (24a-24d) pour fixer la plaque aux vertèbres (18, 20) et autres matières osseuses. La plaque cervicale (22) présente plusieurs poches ou ouvertures (30a-30d), de préférence au minimum quatre, pour recevoir un nombre correspondant de fixations (24a-24d). Les poches ont une surface sphérique (34), et les têtes des fixations ont une surface (48) également sphérique et de taille similaire qui, une fois insérée, permet à chaque fixation d'être orientée à plusieurs angles de projection vis-à-vis de la plaque (22). A chaque poche (30a-30d), la plaque cervicale (22) intègre un dispositif de maintien (40) des fixations. Ce dispositif peut se présenter sous forme de languette saillante ou de barre soutenue à ses deux extrémités, plastiquement déformable dans les deux cas entre une position ouverte, pour recevoir la fixation, et une position fermée pour prévenir son escamotage.

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