A - Human Necessities – 61 – F
Patent
A - Human Necessities
61
F
A61F 2/06 (2006.01) B29C 35/02 (2006.01) B29C 55/00 (2006.01) A61F 2/00 (2006.01)
Patent
CA 2603159
The vascular graft is for implantation within a body and has a PTFE tube structure (12b) including a length and inner and outer wall surfaces. The tube structure (12b) has a non-expanded portion (50, 54, 58, 60, 64, 70, 76, 78, 84, 86, 88, 92, 94) formed from sintering a PTFE green tube extrudate and an expanded portion (23b, 24b) formed subsequent to the sintering. The expanded (24b) and non-expanded portions (50) are of the same extrudate. The expanded portion (24b) has a region which adjoins the non-expanded portion (50) wherein a degree of expansion of the region is limited by the non-expanded portion (50). The limiting of the expansion by the non-expanded portion (50) is attenuated at a location of the region which is remote from the non-expanded portion (50). A method for making the vascular graft facilitates the formation of the non-expanded and expanded portions of the PTFE tube structure.
L'invention concerne un greffon vasculaire destiné à être implanté dans un corps et comprenant une structure tubulaire de PTFE (12b) possédant une longueur et des surfaces de paroi intérieure et extérieure. La structure tubulaire (12b) comprend une partie non expansée (50, 54, 58, 60, 64, 70, 76, 78, 84, 86, 88, 92, 94) formée par frittage d'un extrudat tubulaire brut de PTFE et une partie expansée (23b, 24b) formée après le frittage. Les parties expansée (24b) et non expansée (50) proviennent du même extrudat. La partie expansée (24b) comprend une zone reliée à la partie non expansée (50), un degré d'expansion de cette zone étant limité par la partie non expansée (50). La limitation de l'expansion par la partie non expansée (50) est atténuée au niveau d'un emplacement de la zone distante par rapport à la partie non expansée (50). Un procédé de fabrication de ce greffon vasculaire facilite la formation des parties non expansée et expansée de la structure tubulaire de PTFE.
Boston Scientific Limited
Piasetzki & Nenniger Llp
LandOfFree
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