Single phase liquid refrigerant cryoablation system with...

A - Human Necessities – 61 – B

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A61B 18/02 (2006.01)

Patent

CA 2756263

Single phase liquid refrigerant cryoablation systems and methods are described herein. The cryoablation systems drive liquid cryogen or refrigerant along a closed fluid pathway without evaporation of the liquid cryogen. A cryoprobe includes a distal energy delivery section to transfer energy to the tissue. A plurality of cooling microtubes positioned in a distal section of the cryoprobe transfer cryogenic energy to the tissue. The plurality of microtubes in the distal section are made of materials which exhibit flexibility at cryogenic temperature ranges, enabling the distal section of the cryoprobe to bend and conform to variously shaped target tissues.

L'invention porte sur des systèmes et des procédés de cryoablation à liquide réfrigérant monophase. Les systèmes de cryoablation entraînent un cryogène liquide ou un liquide de réfrigération sur un trajet de fuite fermé sans évaporation du cryogène liquide. Une cryosonde comprend une section distale de distribution d'énergie destinée à transférer de l'énergie au tissu. Une pluralité de microtubes de refroidissement positionnés dans une section distale de la cryosonde transfèrent l'énergie cryogénique au tissu. Les microtubes de la pluralité dans la section distale sont constitués de matériaux présentant une flexibilité dans des plages de température cryogénique, permettant d'incurver la section distale de la cryosonde et de la rendre conforme à des tissus cibles de diverses formes.

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