The utility model discloses the associated system of a catheter device. The catheter device comprises an expandable netted structure used for endovascular renal neuromodulation. The catheter treatment device comprises an expandable netted structure for positioning an energy conveying element to be in contact with a renal artery through an endovascular path. The netted structure adopts an expandable construction capable of releasing heat and/or discharging electricity indirectly and/or directly so as to heat nerve fibers contributing to renal functions or perform electrical modulation on the nerve fibers. The shrinkage construction facilitates the insertion and/or the removal of a catheter or the re-positioning of the energy conveying element in the renal artery.