The present invention relates to a device for mitral valve cerclage which is used on mitral valve cerclage patients with mitral regurgitation, and the device safely and effectively transfers and maintains the final appropriate tension required for cerclage. The device for mitral valve cerclage of the present invention for protecting the tissues of the coronary sinus and the tricuspid valve and for delivering a knot to maintain the tension of a cerclage string, comprises: (A) a tissue protective device (20) comprising a tube for the coronary sinus (22) which is a hollow cylindrical tube for protecting the tissue of the coronary sinus, a tube for the tricuspid valve (24) which is a hollow cylindrical tube for protecting the tissues of the tricuspid valve and the ventricular septum, and a stalk portion (26) in which the tube for the coronary sinus and the tube for the tricuspid valve are extended to be fixed and combined to each other and (B) a knot delivery device (30) which is a hollow catheter, and has an openable/closable open/close portion (32) at one end, and a through-hole (34) formed longitudinally at a lateral side of the open/close portion.La présente invention concerne un dispositif pour cerclage de valvule mitrale qui est utilisé sur des patients de cerclage de valvule mitrale, le dispositif assurant le transfert sûr et efficace et le maintien de la tension finale appropriée pour le cerclage. Le dispositif pour le cerclage de valvule mitrale selon la présente invention pour la protection des tissus du sinus coronaire et de la valvule tricuspide et pour la pose dun nœud pour maintenir la tension dun fil de cerclage, comporte: (A) un dispositif de protection tissulaire (120) comprenant un tube pour le sinus coronaire (22) qui est un tube creux de forme cylindrique pour protéger le tissu du sinus coronaire, un tube pour la valvule tricuspide (24) qui est un tube creux de forme cylindrique pour protéger les tissus de la valvule tricuspide et du septum ventricul
