Abstract: Systems, methods, and catheters for endovascular treatment of a blood vessel are disclosed. In one aspect, a catheter for endovascular treatment of a blood vessel. The catheter comprises a housing. The catheter further comprises a treatment portion. The catheter further comprises a fistula forming element. And the catheter further comprises an intravascular ultrasound imaging device.

Abstract: A system for forming a fistula, including a catheter including a catheter body, an electrode, one or more arrays of magnets, and a plurality of biasing rails. The one or more arrays of magnets are arranged longitudinally along the catheter body. The plurality of biasing rails extend along a length of the catheter body and are configured to radially arch away from the catheter body between a proximal point positioned proximal a first end of at least one array of magnets and a distal point positioned distal to a second end of the at least one array of magnets. The plurality of biasing rails bias the working site and the one or more arrays of magnets against a blood vessel wall. The plurality of biasing rails are joined by a connecting rail that laterally extends between the plurality of biasing rails.