Shape modification system for a cooling chamber of a medical device

A medical device, comprising:

• a catheter body defining a proximal portion and a distal portion;
• a guidewire lumen at least partially disposed within and movable within the catheter body, wherein the guidewire lumen includes a proximal end and a distal end, the distal end being disposed outside the catheter body;
• an expandable element defining a proximal end and a distal end, wherein the proximal end is coupled to the distal portion of the catheter body and the distal end is coupled to the guidewire lumen;
• and
• a tensioning element coupled to the guidewire lumen wherein the tensioning element biases the guidewire lumen towards a pre-determined configuration, wherein the tensioning element includes a balloon.

A medical device, comprising:

• a catheter body defining a proximal portion and a distal portion;
• a guidewire lumen at least partially movably disposed within the catheter body, wherein the guidewire lumen includes a proximal end and a distal end, the distal end being disposed outside the catheter body;
• an expandable element defining a proximal end and a distal end, wherein the proximal end is coupled to the distal portion of the catheter body and the distal end is coupled to the guidewire lumen;
• a tensioning element coupled to the guidewire lumen, wherein the tensioning element biases the guidewire lumen towards a pre-determined longitudinal configuration, such that when the expandable element is expanded, a force applied by the expandable element on the guidewire lumen at least partially overcomes the bias applied by the tensioning element;
• and
• an actuator element coupled to the guidewire lumen for manipulation of longitudinal movement thereof.