Nitinol instrumentation and method for treating scoliosis

Details Nitinol instrumentation and method for treating scoliosis Nitinol instrumentation and method for treating scoliosis

A - Human Necessities

61

B

A61B 17/70 (2006.01)

Patent

CA 2146438

A method and implant for the surgical treatment of scoliosis is disclosed. The method involves the segmental fixation of a rigid rod or rods (38) to the abnormally curved portion of the spine. The rod is constructed of a shape memory alloy such as nitinol. Prior to implementation, the rod is annealed and contoured into an ideal shape for a given patient. At the time of surgery, the rod is deformed to accommodate the existing curvature of the patient's spine and segmentally fixed thereto. The rod is then inductively heated to the transition temperature postoperatively to effect shape recovery and thereby apply corrective forces to the spine. Also disclosed are clamps (20, 24), constructed of shape memory material, for securing the rod to a vertebra (23, 35).

Procédé et implant destinés au traitement chirurgical de la scoliose. Ce procédé consiste à fixer par segments une ou des tiges rigides (38) à la partie anormalement incurvée de la colonne vertébrale. La tige est composée d'un alliage à mémoire de forme tel que le nitinol. Avant son implantation, la tige est recuite et profilée sous une forme idéalement adaptée à un patient particulier. Au moment de l'intervention, la tige est déformée afin de s'adapter à la courbure réelle de la colonne vertébrale du patient, puis fixée par segments à cette dernière. La tige est ensuite chauffée par induction lors d'un stade post-opératoire jusqu'à atteindre la température de transition entraînant la reprise de forme, afin d'appliquer des forces correctives à la colonne vertébrale. L'invention se rapporte également à des clamps (20, 24) fabriqués en un matériau à mémoire de forme et permettant de fixer la tige aux vertèbres (23, 25).

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