Artificial disc replacements with natural kinematics

Details Artificial disc replacements with natural kinematics Artificial disc replacements with natural kinematics

A - Human Necessities

61

F

A61F 2/44 (2006.01)

Patent

CA 2483226

This invention improves upon prior aft total disc replacements (TDRs) by more closely replicating the kinematics of a natural disc. The preferred embodiments feature two or more fixed centers of rotation (CORs) and an optional variable COR (VCOR) as the artificial disk replacement (ADR) translates from a fixed posterior COR that lies posterior to the COR of the TDR to facilitate normal disc motion. The use of two or more CORs allows more flexion and more extension than permitted by the facet joints and the artificial facet (AF). AF joint-like components may also be incorporated into the design to restrict excessive translation, rotation, and/or lateral bending.

L'invention améliore l'état de la technique des disques entiers de remplacement (TDRs) par une meilleure réplication de la cinématique d'un disque naturel. Selon les modes de réalisation préférés de l'invention, au moins deux centres de rotation (CORs) fixes et un COR optionnel variable (VCOR) lorsque le disque artificiel de remplacement (ADR) bouge d'un COR postérieur fixe, situé à l'arrière du COR du TDR, facilitent le déplacement normal du disque. Par l'utilisation d'au moins deux CORs, on obtient une meilleure flexion et une meilleure extension que ce que permettent les facettes des vertèbres lombaires et de la facette artificielle (AF). On peut également incorporer les composants de type articulation AF à la conception pour réduire la translation, rotation et/ou flexion latérale excessives.

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