Implant for osseous anchoring with polyaxial head

Details Implant for osseous anchoring with polyaxial head Implant for osseous anchoring with polyaxial head

A - Human Necessities

61

B

A61B 17/70 (2006.01) A61B 17/64 (2006.01)

Patent

CA 2469260

The present invention relates to an osseous anchorage implant comprising fixation means capable of receiving and fixing at least one bar, in particular of osteosynthesis, the implant (1) comprising on the one hand osseous anchoring means (10) and on the other hand a fixation head (11) bearing the fixation means, the fixation head being traversed by at least one channel (12) receiving the bar (2), and comprising clamping means (4) capable of clamping the bar against one inside wall, called support wall (32), the implant (1) being characterized in that the fixation means (4) and said support wall (32) enable obtaining, prior to blocking of the fixation, a determined clearance in rotation around at least one first axis (d3) not parallel to the longitudinal axis of the bar, in that the clamping means comprise a face at the contact of the bar, called the moving clamping surface (120), the moving clamping face (420) of the clamping means (4) being borne by a support head (42) articulated at the end of the clamping means (4) by a ball and socket connection, and in that the channel (12) has the form of an open channel having an aperture (120) opening onto one of the lateral faces of the fixation head (11), an edge (124) of said aperture bearing the clamping means (4), the aperture (120) of the channel and the position of the clamping means thus enabling the introduction (i) of the bar by the lateral route.

L'invention concerne un implant d'ancrage osseux comprenant des moyens de fixation capables de recevoir et de fixer au moins une barre, notamment d'ostéosynthèse. L'implant (1) comprend, d'une part, des moyens d'ancrage osseux (10) et d'autre part, une tête de fixation (11) supportant les moyens de fixation, au moins un canal (12) recevant la barre (2) traversant la tête de fixation, et comprenant des moyens de serrage (4) permettant de serrer la barre contre une paroi intérieure, appelée paroi support (32). L'implant (1) est caractérisé en ce que les moyens de fixation (4) et ladite paroi support (32) permettent d'obtenir, avant le blocage de la fixation, un jeu déterminé en rotation autour d'au moins un premier axe (d3) non parallèle à l'axe longitudinal de la barre, en ce que les moyens de serrage comprennent une surface en contact avec la barre, appelée surface de serrage mobile (120), la surface de serrage mobile (420) des moyens de serrage (4) étant créée par une tête support (42) articulée au niveau de l'extrémité des moyens de serrage (4) par une connexion de rotule, et en ce que le canal (12) présente la forme d'un canal ouvert doté d'une ouverture (120) s'ouvrant sur une des surfaces latérales de la tête de fixation (11), un bord (124) de ladite ouverture supportant les moyens de serrage (4), l'ouverture (120) du canal et la position des moyens de serrage permettant ainsi l'introduction (i) de la barre par voie latérale.

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