Compensation assembly for fluid injection line of intravascular catheter system

A cryoablation catheter comprising:

• a catheter shaft;
• a guidewire lumen disposed within and slidable relative to the shaft;
• a cryoballoon having a first end portion secured to a distal end of the shaft, and a second end portion attached to the guidewire lumen distal to the distal end of the shaft;
• a fluid injection line having a fluid discharge region positioned within the cryoballoon, the fluid discharge region including a fluid port so that cryogenic fluid can be distributed from the fluid injection line to within the cryoballoon, the fluid discharge region being movable relative to the guidewire lumen;
• and
• a handle assembly coupled to a proximal end of the shaft and including a handle manifold through which the guidewire lumen and the fluid injection line slidably extend, and further including a guidewire lumen sealer that forms a seal around the guidewire lumen.

A cryoablation catheter comprising:

• a catheter shaft;
• a guidewire lumen disposed within and slidable relative to the shaft;
• a cryoballoon having a first end portion secured to a distal end of the shaft, and a second end portion attached to the guidewire lumen distal to the distal end of the shaft;
• a fluid injection line having a fluid discharge region positioned within the cryoballoon, the fluid discharge region including a fluid port so that cryogenic fluid can be distributed from the fluid injection line to within the cryoballoon, the fluid discharge region being movable relative to the guidewire lumen;
• a fluid injection line stop that is positioned within the cryoballoon;
• a distal bias stop that is secured to the fluid injection line;
• and
• a fluid injection line bias that imparts a bias force upon the distal bias stop to bias the fluid injection line in a direction toward the fluid injection line stop.