A delivery tool for the implantation of an intracorporeal capsule, comprising an operating handle and a steerable catheter, wherein the catheter comprises an internal tube and an external tube, coaxial to each other, mounted telescopically into each other, with possibilities of mutual rotation and mutual axial translation, the internal tube comprising at least one central lumen (46, 48) extending from a proximal end to a distal end of the catheter, the at least one lumen housing a security wire moving freely in the lumen, the internal tube being coupled in translation and in rotation at its distal end to the intracorporeal capsule, wherein the catheter further comprises, over the length of the external tube, at least one steering cable adapted to undergo a traction exerted from the proximal end of the catheter, wherein the operating handle is mounted at the proximal end of the catheter and comprises: a handle body adapted to be held in hand by an operator, the handle body being coupled to the external tube of the catheter; a piston, axially mobile in rotation and in translation inside the handle body, and coupled in rotation and in translation to the internal tube of the catheter; and a first control mechanism, comprising a bending actuator operable to modify in a controlled manner the tension of the steering cable whereby controlling the steering of the catheter, wherein the traction exerted on at least one steering cable generates in a given plane a bending of a corresponding distal region of the catheter, and said at least one steering cable is offset with respect to the internal tube, and characterised in that said first control mechanism comprises a drum to which is fixed said at least one steering cable for winding said at least one steering cable, and said bending actuator is operable to control a rotation of the drum, whereby modifying in a controlled manner the tension of said at least one steering cable. wherein the catheter further comprises, over the length of the external tube, at least one steering cable adapted to undergo a traction exerted from the proximal end of the catheter, wherein the operating handle is mounted at the proximal end of the catheter and comprises: a handle body adapted to be held in hand by an operator, the handle body being coupled to the external tube of the catheter; a piston, axially mobile in rotation and in translation inside the handle body, and coupled in rotation and in translation to the internal tube of the catheter; and a first control mechanism, comprising a bending actuator operable to modify in a controlled manner the tension of the steering cable whereby controlling the steering of the catheter, a handle body adapted to be held in hand by an operator, the handle body being coupled to the external tube of the catheter; a piston, axially mobile in rotation and in translation inside the handle body, and coupled in rotation and in translation to the internal tube of the catheter; and a first control mechanism, comprising a bending actuator operable to modify in a controlled manner the tension of the steering cable whereby controlling the steering of the catheter, wherein the traction exerted on at least one steering cable generates in a given plane a bending of a corresponding distal region of the catheter, and said at least one steering cable is offset with respect to the internal tube, and characterised in that said first control mechanism comprises a drum to which is fixed said at least one steering cable for winding said at least one steering cable, and said bending actuator is operable to control a rotation of the drum, whereby modifying in a controlled manner the tension of said at least one steering cable.