Implant element

A - Human Necessities – 61 – L

Patent

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Details

A61L 27/00 (2006.01) A61L 27/30 (2006.01) A61L 27/32 (2006.01) A61L 27/40 (2006.01) C04B 35/645 (2006.01)

Patent

CA 2309709

The invention relates to an implant element or other medical component made of a material consisting of a core and a surface layer applied thereon, which has a high degree of strength and a favourable biological response to surrounding tissue. The thickness of the surface layer is chosen such that it is less than c in the equation KIC = Y .sigma. c1/2 where KIC is the fracture toughness, Y a position and shape factor, c the critical defect size, and .sigma. the permitted stress for the actual material and the chosen design stress. The surface layer has a thickness preferably less than 30 or even less than 2 micrometres. The layer contains preferably Ca phosphate apatite or an oxide of titanium, zirconium or tantalum.

L'invention concerne un élément implant ou un autre composant médical réalisé dans un matériau consistant en un noyau recouvert d'une couche superficielle et ayant une grande résistance et une réponse biologique favorable au tissu environnant. L'épaisseur de la couche superficielle est choisie de manière à être inférieure à c dans l'équation K¿IC? = Y .sigma. c1/2 où K¿IC? est la ténacité, Y un facteur de position et de forme, c la taille de défaut critique, et .sigma. la contrainte admise du matériau concerné et la contrainte de sécurité choisie. La couche superficielle a une épaisseur, de préférence, inférieure à 30 ou même inférieure à 2 micromètres. La couche contient, de préférence, de l'apatite Ca ou un oxyde de titane, du zirconium ou du tantale.

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