A - Human Necessities – 61 – F
Patent
A - Human Necessities
61
F
A61F 2/06 (2006.01) A61F 2/90 (2006.01) A61L 27/16 (2006.01) A61L 27/50 (2006.01)
Patent
CA 2361063
A method is disclosed for making vascular prostheses from ePTFE said prostheses having a diameter which is larger, and a wall thickness which is smaller than previously achievable using ram extrusion techniques. The method consists of extruding a PTFE tube, finish processing the tube into an ePTFE tube, laterally dilating it by expansion in incremental steps, calendering the tube after each dilating step, while the tube is being maintained at an elevated temperature. Once the tube is dilated it can be sintered with another tube to form a laminate. Alternatively, a wire stent may be joined with one or more tubes, thereby biasing the laminate to a cylindrical configuration.
Cette invention concerne un procédé de fabrication de prothèses vasculaires à partir de polytétrafluoroéthylène (PTFE), lesdites prothèses ayant un diamètre plus importants et des parois moins épaisses que les prothèses obtenues jusqu'ici au moyen de techniques d'extrusion à coulisseau. Ce procédé consiste à extruder un tube de PTFE, de transformer ce tube en tube ePTFE (polytétrafluoroéthylène expansé), à dilater latéralement ce tube par expansion progressive, à calendrer ce tube après chaque opération de dilatation tout en le maintenant à une température élevée. Après dilatation, le tube peut être fritté avec un autre tube et former un ensemble stratifié. Une autre solution consiste à relier un stent en fil métallique à un ou plusieurs tubes, en donnant à force une forme cylindrique au stratifié.
Colone William M.
Creer William L.
Farl Kevin G.
Sinnott Joseph B.
Teeter Barbara L.
Endomed Inc.
Gowling Lafleur Henderson Llp
Lemaitre Acquisition Llc
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