Variable stiffness stem for prosthetic implants

A - Human Necessities – 61 – F

Patent

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A61F 2/30 (2006.01)

Patent

CA 2664425

A method for forming an implant for a bone comprises the step (20) of generating a first general shape for the implant having a length extending along a long axis of the bone. A step (40) determines an area moment of inertia of a cross section of the implant. Step (40) also determines an area moment of inertia for a cross section of bone coplanar to the cross section of the implant. A percent stress shielding is calculated (50) from the area moments of inertia of the implant and the bone. A step (60) compares the calculated percent stress shielding to a preset threshold. Iteratively, additional general shapes are generated (80) for the implant by locally adjusting the cross section of the implant until the calculated percent stress shielding meets the preset threshold.

L'invention porte sur un procédé de formation d'un implant osseux, qui comprend les étapes suivantes: on commence par produire (20) une première forme générale d'implant dont la longueur s'étend le long d'un axe long de l'os; on détermine ensuite (40) un moment d'inertie d'une section transversale de l'implant, et l'on détermine également (40) un moment d'inertie d'une section transversale de l'os coplanaire par rapport à la section transversale de l'implant; on calcule (50), à partir des moments d'inertie de l'implant et de l'os, un pourcentage d'effet bouclier anti-contraintes; on compare (60) le pourcentage calculé d'effet bouclier anti-contraintes à un seuil prédéterminé; et l'on produit de manière itérative (80) des formes générales supplémentaires de l'implant, en ajustant localement la section transversale de l'implant jusqu'à ce que le pourcentage calculé d'effet bouclier anti-contraintes atteigne le seuil prédéterminé.

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