A tissue ablation apparatus comprises a first elongated delivery device including a lumen and an obturator with a tissue piercing distal end. The obturator is positionable in the lumen of the first elongated delivery device. A second elongated delivery device is positionable in the lumen of the first...http://www.google.fr/patents/US6632222?utm_source=gb-gplus-shareBrevet US6632222 - Tissue ablation apparatus
