Medical implant such as a stent

Details Medical implant such as a stent Medical implant such as a stent

A - Human Necessities

61

F

A61F 2/06 (2006.01)

Patent

CA 2575364

A medical implant such as a self-expanding shape memory alloy stent with a strut matrix formed by cut patterns in a wall of a tubular workpiece (12) can be enhanced by arranging for the line of the laser beam when cutting the struts (62) to be one that does not pass through the longitudinal rotational axis (10) of the tubular workpiece. Such "off-axis-" cutting can modify the cross-sectional shape and area of each strut, along its length. Such modulation can enhance the fatigue resistance of the stent matrix, or increase the radial force that the stent matrix is capable of exerting on bodily tissue within which it is implanted.

L'invention concerne un implant médical, tel qu'un stent en alliage à mémoire de forme autodéployable comportant une matrice à jambes de force formée par des motifs de découpe réalisés dans une paroi d'une pièce à usiner tubulaire (12). L'implant médical peut être amélioré suivant une configuration du faisceau laser qui fait que, pendant la coupe des jambes de force (62), la raie du faisceau laser ne traverse pas l'axe de rotation longitudinal (10) de la pièce à usiner tubulaire. Une telle découpe à "axe décalé" peut modifier la forme et l'aire transversales de chaque jambe de force, sur sa longueur. Une telle modulation peut améliorer la résistance à l'usure de la matrice de stent, ou augmenter la force radiale que la matrice de stent peut exercer sur un tissu corporel dans lequel elle est implantée.

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