Per Elgaard Pedersen,Allan Torp,Raimo Urban Butzbacker,Rune T. Paamand
申请号：
US15079975
公开号：
US20160278839A1
申请日:
2016.03.24
申请国别(地区):
US
年份:
2016
代理人:
摘要：
RF ablation system includes a catheter having a lumen therein and a first electrode. Second electrode is disposed around the catheter proximate the distal end of the catheter and spaced from the first electrode by an insulating spacer which may be a part of the catheter or a sleeve on the first electrode. The first electrode is able to slide in and out of the catheter to vary the exposed length of the first electrode and as a result to alter the energy density at the first electrode in order to exhibit different heating effects. Control unit controls current through the electrodes and also the exposed length of the first electrode. The second electrode has a surface area at least twice that of the first electrode. Consequently, negligible heat is generated at the second electrode and therefore no blood clotting or other ablation material is formed over the catheter.
