The invention relates to a coring device for producing an opening in a tissue wall, said device comprising: - a body having a longitudinal axis, said body having a proximal end and a distal end, said body comprising an internal housing, - a head core (13) having a transsection blade (14), which head is movable between a resting position and an actuated position, - an actuating mechanism for moving said head between said positions, said mechanism comprising an actuating rod (15) at one end of which is placed said movable head, - a lumen (20) extending through at least the proximal end of said body, said actuating rod (15) and said coring head (13) for the passage of a flexible guiding element, and - the distal end of said body forms a surgical tool support (21), this tool support (21) being configured for * on the one hand, receiving nesting a hollow surgical tool (22) and supporting the tool, which tool surrounds the distal end of said body when placed on said tool support (21), being coaxial with said core axis, and on the other hand, allow linear guidance of said surgical tool (22) during its outward movement of the coring device. L'invention concerne un dispositif de carottage pour réaliser une ouverture dans une paroi tissulaire, ce dispositif comprenant : - un corps ayant un axe longitudinal, ledit corps ayant une extrémité proximale et une extrémité distale, ledit corps comportant un logement interne, - une tête de carottage (13) comportant une lame de transsection (14), cette tête étant mobile entre une position de repos et une position actionnée, - un mécanisme d'actionnement pour déplacer ladite tête entre lesdites positions, ledit mécanisme comportant une tige d'actionnement (15) à une extrémité de laquelle est placée ladite tête mobile, - une lumière (20) s'étendant à travers au moins l'extrémité proximale dudit corps, ladite tige d'actionnement (15) et ladite tête de carottage (13) pour le passage d'un élément de guidage souple,
