Adjustable intervertebral implant

A - Human Necessities – 61 – F

Patent

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Details

A61F 2/30 (2006.01) A61F 2/44 (2006.01)

Patent

CA 2676616

An expandable intervertebral implant (10) includes a first member (20), a second member (40), and a collar operatively associated with the first and second members, wherein the collar includes a threaded mechanism so that rotation of the collar causes the second member to axially move with respect to the first member. The implant includes a ratchet mechanism (50, 80) so that when at least a predetermined amount of force is applied, the second member moves with respect to the first member in an axial, ratchet-type manner. The collar preferably includes a drive ring (50) rotatably attached to the first member and a ratchet ring (50) operatively associated with the drive ring. The ratchet ring includes an inner bore having at least one corresponding ratchet thread tooth form formed thereon for engaging a ratchet thread tooth form formed on the second member.

L'invention concerne un implant intervertébral expansible qui comprend un premier élément, un deuxième élément et une bague associée exploitable aux premier et deuxième éléments. La bague comprend un mécanisme fileté, de sorte que la rotation de la bague entraîne un déplacement axial du deuxième élément par rapport au premier élément. L'implant comprend un mécanisme de cliquet, de sorte que lors de l'application d'au moins une quantité prédéterminée de force, le deuxième élément se déplace axialement par rapport au premier élément à la manière d'un cliquet. La bague comprend de préférence un anneau d'entraînement fixé rotatif au premier élément, et un anneau de cliquet associé exploitable à l'anneau d'entraînement. L'anneau de cliquet comprend un orifice interne comportant au moins une forme de dent filetée de cliquet correspondante, formée sur celui-ci et destinée à venir en prise avec une forme de dent filetée de cliquet formée sur le deuxième élément.

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