Intraluminal device with lubricious surface

A - Human Necessities – 61 – M

Patent

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Details

A61M 25/09 (2006.01) A61L 31/08 (2006.01) A61M 25/00 (2006.01) A61M 25/01 (2006.01)

Patent

CA 2220121

This invention comprises a guidewire with a tenacious lubricious coating on its surface comprising a finely divided lubricious particulate. The coatings of this invention have a thickness of not more than about 0.00002 inch, a coefficient of friction of not more than about 0.030 and a hardness not less than about 1.0 Mohs. Preferably, the surface coating comprises a monomolecular layer of particulate tungsten disulfide. The guidewire of this invention incorporates an improved distal tip configuration comprising a flexible elongate core member which has at least one tapered section at its distal extremity and a flattened distal portion. The distal portion has two or more flattened regions having cross-sectional areas which decrease in the distal direction. A flexible helical coil is attached to the core member and comprises three or more distinct regions, each having increasing coil spacing in the distal direction. Preferably, the entire length of the guidewire proximal to the helical coil has the lubricious particulate surface coating of the invention.

L'invention concerne un fil-guide présentant à sa surface un revêtement glissant et tenace constitué d'une matière particulaire glissante finement divisée. Le revêtement selon l'invention présente une épaisseur d'au plus environ 0,00002 pouce, un coefficient de frottement d'au plus environ 0,030 et une dureté d'au moins 1,0 Mohs. De préférence, le revêtement de surface comprend une couche monomoléculaire de disulfure de tungstène. Le fil-guide selon l'invention comporte une configuration à pointe distale améliorée constituée d'un élément central allongé et souple à au moins une section conique à son extrémité distale et une partie distale aplatie. La partie distale présente au moins deux régions aplaties à section décroissante dans le sens distal. Une bobine hélicoïdale souple est fixée à l'élément central et comprend au moins trois régions distinctes espacées de manière croissante dans le sens distal. De préférence, la totalité de la longueur du fil-guide à proximité de la bobine hélicoïdale présente le revêtement de surface glissant selon l'invention.

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