Medical device formed of ultrahigh molecular weight polyolefin

Details Medical device formed of ultrahigh molecular weight polyolefin Medical device formed of ultrahigh molecular weight polyolefin

A - Human Necessities

61

L

A61L 29/04 (2006.01) A61L 27/16 (2006.01)

Patent

CA 2394267

Medical devices having at least a component, such as a catheter balloon, stent cover and vascular graft, formed of ultrahigh molecular weight polyolefin, such as ultrahigh molecular weight polyethylene. The device component is formed from ultrahigh molecular weight polyethylene that has been processed so that it is microporous and has an oriented node and fibril structure. The device component expands compliantly at low strains and are substantially less compliant at higher strains. The invention also comprises methods for making such medical devices, including the steps of compacting a polyethylene powder and deforming it to impart the oriented structure.

L'invention concerne des dispositifs médicaux ayant au moins un composant, par exemple un cathéter à ballonnet, une enveloppe d'extenseur, un implant vasculaire, en polyoléfine d'un poids moléculaire élevé, par exemple le polyéthylène à poids moléculaire très élevé, qui a été traité de façon à le rendre microporeux et à lui donner un noeud orienté et une structure de fibrilles. Le composant du dispositif se dilate de façon compliante à de faibles contraintes et sensiblement moins compliante à des contraintes plus élevées. L'invention concerne également les procédés de fabrication de tels dispositifs médicaux, y compris les étapes de compactage d'une poudre de polyéthylène et de sa déformation pour lui conférer la structure orientée.

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