Circumferential ablation device assembly and methods of use...

A - Human Necessities – 61 – B

Patent

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A61B 18/14 (2006.01) A61N 7/00 (2006.01)

Patent

CA 2361157

A medical balloon catheter assembly includes a balloon having a permeable region and a non-permeable region. The balloon is constructed at least in part from a fluid permeable tube such that the permeable region is formed from a porous material which allows a volume of pressurized fluid to pass from within a chamber formed by the balloon and into the permeable region sufficiently such that the fluid may be ablatively coupled to tissue engaged by the permeable region. The non-permeable region is adapted to substantially block the pressurized fluid from passing from within the chamber and outwardly from the balloon. Such voids may be created by expanding the fluoropolymer. The porous material extends along both the permeable and non-permeable regions. In one mode of this construction, the material is porous along the permeable region and non-porous along the non-permeable region, such as by expanding only the permeable region. The pores in may also be provided along both permeable and non-permeable sections but are a dip coated, deposited, or extruded material along the non-permeable section in order to prevent fluid from passing therethrough. The insulator material may in one mode be provided in many shapes on the surface of the balloon.

L'invention concerne un ensemble cathéter médical à ballonnet comprenant un ballonnet comportant une zone perméable et une zone non perméable. Le ballonnet est obtenu, du moins en partie, à partir d'un tube perméable au fluide de manière que la zone perméable soit constituée d'une matière poreuse permettant à un certain volume de fluide sous pression de passer d'une chambre formée par le ballonnet à la zone perméable, en quantité suffisante pour que le fluide puisse être couplé de façon ablative aux tissus en contact avec la zone perméable. La zone non perméable est conçue pour empêcher sensiblement le fluide sous pression de passer de la chambre précitée à l'extérieur du ballonnet. Des vides peuvent être créés par expansion d'un fluoropolymère. La matière poreuse s'étend le long des zones perméable et non perméable. Selon un mode de réalisation, la matière est poreuse le long de la zone perméable et non poreuse le long de la zone non perméable, ce que l'on obtient par expansion de la zone perméable uniquement. Les pores peuvent également être formés le long des sections perméable et non perméable mais ils sont sensiblement bouchés par une matière isolante trempée, déposée ou extrudée le long de la section imperméable afin d'empêcher tout passage du fluide. La matière isolante peut, selon un mode de réalisation, être réalisée selon plusieurs formes à la surface du ballonnet.

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