Perfusion balloon and radioactive wire delivery system

A - Human Necessities – 61 – N

Patent

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Details

A61N 5/00 (2006.01) A61N 5/10 (2006.01)

Patent

CA 2291092

This invention is a catheter (320) capable of irradiating blood vessel walls to inhibit restenosis after angioplasty. Catheters (320) are capable of simultaneous irradiation, angioplasty, and in some devices drug infusion. Preferred catheters (320) include a helical perfusion balloon (336) having strand windings (346) spaced apart when inflated, and defining a perfusion lumen (356) within. A tubular sheath (374) over the helical strands (346), and distal shaft region (326) is used in some embodiments and defines an outer wall for the perfusion lumen (356). A spiral, inter-strand space (376) is defined between the sheath outer wall, and the blood vessel inner wall providing a confined volume for controlled delivery of drugs to the vessel wall in conjunction with irradiation. A device having a radiation wire distally closed end tube is provided. A device having a radiation wire open ended tube terminating proximally of the perfusion lumen is also provided.

L'invention concerne un cathéter (320) pouvant irradier les parois du vaisseau sanguin pour inhiber une resténose après une angioplastie. Les cathéters (320) de l'invention peuvent à la fois effectuer une irradiation, une angioplastie et, dans certains dispositifs, une infusion de médicaments. Des cathéters préférés (320) incluent un ballonnet de perfusion (336) muni d'enroulements de fils (346) espacés lorsque le ballonnet est gonflé et délimitant une lumière de perfusion (356) placée à l'intérieur. Une gaine tubulaire (374) recouvrant les fils spiralés (346) et une partie de manchon distale (326) est utilisée dans certaines formes de réalisation et délimite une paroi externe pour la lumière de perfusion (356). Un espace spiralé (376) entre les fils est délimité entre la paroi externe de la gaine et la paroi interne du vaisseau sanguin et présente un volume captif pour combiner un apport régulé de médicaments à la paroi vasculaire et une irradiation. L'invention concerne en outre un dispositif comprenant un tube terminal à fil radioactif et fermeture distale; elle concerne enfin un dispositif comprenant un tube extensible à fil radioactif arrivant à proximité de la lumière de perfusion.

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