Controllable pressure cryogenic balloon treatment system and...

A - Human Necessities – 61 – B

Patent

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A61B 18/18 (2006.01)

Patent

CA 2528011

Devices, systems, and methods controllably cool blood vessels and other body lumens. The blood vessel will often be treated for atherosclerotic or other diseases by inflating a balloon so as to engage the surrounding luminal wall. Controlled cooling of the balloon effected by a change in phase of a cryogenic fluid within the balloon typically a change from a liquid phase to a gas phase can be provided with a controlled, gradual inflation of the balloon. A single control system can be used for any of a variety of alternative selectable balloon catheters having significantly differing cooling fluid flow characteristics.

L'invention concerne des dispositifs, des systèmes et des procédés pour refroidir de manière contrôlée les vaisseaux sanguins ou d'autres lumières du corps. Un vaisseau sanguin est souvent traité en cas de maladies athérosclérotiques ou autres par le gonflement d'un ballonnet permettant de mettre en contact la paroi luminale environnante. Le refroidissement contrôlé du ballonnet obtenu par un changement de phase d'un fluide cryogénique a l'intérieur du ballonnet, normalement sous la forme d'un changement de phase entre phase liquide et phase gazeuse, peut être assuré par l'inflation graduelle du ballonnet. Un système de commande unique peut être utilisé pour n'importe lequel d'une pluralité de cathéters à ballonnets pouvant être sélectionnés, qui possèdent des caractéristiques sensiblement différentes de fluide de refroidissement.

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