Neuromodulation catheter

A catheter comprising:

• an elongate body comprising:
• a multi-filar tube comprising a plurality of filars, the multi-filar tube defining an inner diameter of 457 micrometers or less and an outer diameter of 635 micrometers or greater, and
• a proximal portion and a distal portion;
• and
• a plurality of electrodes carried by the distal portion, wherein:
• the distal portion of the elongate body is configured to transform from a low-profile delivery state to a radially expanded deployed state in which at least some electrodes of the plurality of electrodes are deployed at different circumferential positions of the radially expanded deployed state,
• a ratio of a deployed electrode length to a diameter of the distal portion of the elongate body in the radially expanded deployed state is less than or equal to 2.0,
• the deployed electrode length is a distance between, in the radially expanded deployed state, a proximal-most point of a proximal-most electrode of the plurality of electrodes and a distal-most point of a distal-most electrode of the plurality of electrodes,
• the distal portion of the elongate body is defined by a portion of the elongate body from the proximal-most point of the proximal-most electrode of the plurality of electrodes to the distal-most point of the distal-most electrode of the plurality of electrodes, wherein the diameter of the distal portion is configured to be constrained by a vessel in which the distal portion is positioned, the vessel having a diameter of between 3 mm and 8 mm, and
• the plurality of electrodes are configured to deliver radio frequency (RF) energy in a substantially continuous toroid shape.