Multifunctional ablation device

A method of treating cardiac tissue, the method comprising:

• positioning an expandable first thermally transmissive region of a medical device proximate a pulmonary vein, the medical device including an elongate body;
• positioning a non-expandable second thermally transmissive region of the medical device proximate an atrial wall, the non-expandable second thermally transmissive region including a first deflection profile and being disposed between a first adjacent medical device body segment and a second adjacent medical device body segment, each of the first and second adjacent medical device body segment including a deflection profile different from the first deflection profile, the first adjacent medical device body segment being between the expandable first thermally transmissive region and the non-expandable second thermally transmissive region;
• applying a compressive force from a proximal portion of the medical device to the non-expandable second thermally transmissive region, such that the compressive force causes the thermal segment to deflect toward and come into contact with the atrial wall;
• circulating cryogenic fluid through a first fluid flow path in fluid communication with the expandable first thermally transmissive region to ablate a portion of the pulmonary vein;
• and
• circulating cryogenic fluid through a second fluid flow path in fluid communication with the non-expandable second thermally transmissive region to ablate a portion of the atrial wall, the first fluid flow path and the second fluid flow path being fluidly isolated from each other.

A method of treating cardiac tissue, the method comprising:

• positioning an expandable first thermally transmissive region of a medical device proximate a pulmonary vein, the medical device including an elongate body having a proximal portion, a distal portion, and a longitudinal axis;
• positioning a non-expandable second thermally transmissive region of the medical device proximate an atrial wall, the non-expandable second thermally transmissive region including a first deflection profile and being disposed between a first adjacent medical device body segment and a second adjacent medical device body segment, each of the first and second adjacent medical device body segment including a deflection profile different from the first deflection profile, the first adjacent medical device body segment being between the expandable first thermally transmissive region and the non-expandable second thermally transmissive region, the non-expandable second thermally transmissive region, the first adjacent medical device body segment, and the second adjacent medical device body segment together having a continuous fixed diameter;
• applying a compressive force from a proximal portion of the medical device to the non-expandable second thermally transmissive region, such that the compressive force causes the thermal segment to deflect toward and come into contact with the atrial wall;
• circulating cryogenic fluid through a first fluid flow path in fluid communication with the expandable first thermally transmissive region to ablate a portion of the pulmonary vein;
• and
• circulating cryogenic fluid through a second fluid flow path in fluid communication with the non-expandable second thermally transmissive region to ablate a portion of the atrial wall, the medical device further including a first transverse wall within the elongate body between the non-expandable second thermally transmissive region and the first adjacent medical device body segment and a second transverse wall within the elongate body between the non-expandable second thermally transmissive region and the second adjacent medical device body segment, each of the first transverse wall and the second transverse wall lying in a plane that is substantially orthogonal to the longitudinal axis, the first transverse wall preventing a flow of fluid dispersed within the non-expandable second thermally transmissive region to the expandable first thermally transmissive region.