Endoscopic ultrasound ablation needle

摘要: A radiofrequency tissue ablation device includes an elongate outer cannula having proximal and distal ends intermediate length therebetween where a longitudinal region of the is configured as electrode. lumen extends longitudinally through cannula. stylet slidably secured to between electrode end. The plurality substantially parallel helical apertures disposed around extending circumference. be circumferentially expandable such that in first state, it essentially cylindrical with uniform diameter along its entire length, second are expanded intervening portions form greater than