A cylindrically shaped wire frame bearing one or more circularly-configured RF electrodes can be contacted against the inner surface of the aorta, e.g., at the renal artery ostium, such that the circular electrodes ablate the nerve activity circumferentially around the renal artery ostium. The wire frame has a shape memory and can be positioned in a collapsed, non-deployed position at the end of a catheter and encapsulated within a sheath and then advanced longitudinally through the blood vessel, e.g., over a guide wire, to the relevant location within the body lumen. The sheath is then withdrawn, allowing the wire frame to be expanded into its deployed position in which it conforms to the walls of the lumen, so as to thereby allow the electrodes to contact the lumen wall to perform the ablation. The circular RF elements can be positioned around the opening to the renal artery using an imaging catheter that is passed through the hole of the circular RF electrode and at least partially into the entrance of the renal artery, and a balloon can be placed through the imaging catheter into the proximal segment of the renal artery for improved positioning and stabilization. The sheath can also have a longitudinal cut out to allow the imaging catheter to protrude out of the wire frame and into the renal artery to position the device at the renal artery ostium, even while the wire frame is still in its collapsed, non-deployed configuration within the sheath. Once the device has been properly positioned, the sheath is withdrawn and the wire frame is expanded such that the RF electrodes are positioned against the renal artery ostium.하나 이상의 원형으로 구성된 RF 전극을 갖는 원통형 형상의 와이어 프레임이 대동맥의 내표면에 맞대어, 예를 들어, 신장 동맥 소공에서, 접촉하여, 원형 전극이 신장 동맥 소공 둘레에서 신경 활동을 애블레이팅할 수 있다. 와이어 프레임은 형상 기억을 가지며, 카테터의 단부에 접힌, 비-전개 포지션으로 포지셔닝되고 시스 내에 캡슐화되고, 이어서 혈관을 통해 종방향으로, 예를 들어, 가이드 와이어 위로, 신체 내강 내의 관련 위치로 전진될 수 있다. 이어서, 시스가 후퇴되어, 와이어 프레임이 그의 전개 포지션으로 확장되게 하는데, 이때 와이어 프레임은 내강의 벽에 일치하여, 전극이 내강 벽과 접촉하여 애블레이션을 수행하게
