Active infusion sheath for ultrasound ablation catheter

An intravascular nerve modulation system comprising:

• an outer tubular member having a proximal end and a distal end and a lumen extending therebetween;
• an inner tubular member disposed within the lumen of the outer tubular member, the inner tubular member having a proximal end and a distal end region, the distal end region of the inner tubular member extending distally beyond the distal end of the outer tubular member;
• at least one ablation transducer affixed to the distal end region of the inner tubular member;
• an infusion sheath having a proximal end and a distal end, the proximal end of the infusion sheath fixedly secured adjacent to the distal end of the outer tubular member.

An intravascular nerve modulation system comprising:

• a first tubular member having a proximal end and a distal end and a lumen extending therebetween;
• a second tubular member extending longitudinally along the first tubular member, the second tubular member having a proximal end and a distal end region, the distal end region of the second tubular member extending distally beyond the distal end of the first tubular member;
• an ultrasound transducer affixed to the distal end region of the second tubular member;
• an infusion sheath having a proximal end and a distal end, the proximal end of the infusion sheath fixedly secured adjacent to the distal end of the first tubular member.