A tissue-piercing device includes two piercing members, and an operation section to which a proximal end of each of the piercing members is connected. Each of the piercing members includes a flexible outer sheath, a slidable inner sheath which is slidably inserted in the outer sheath, and a slidable...http://www.google.de/patents/US7306613?utm_source=gb-gplus-sharePatent US7306613 - Endoscopic instruments
