Disclosed are a sheath-core (100) for delivering an interventional device and a delivery system comprising the sheath-core (100). The sheath-core (100) comprises a core tube (101), wherein the distal end of the core tube (101) is fixed with a guide head (102) and an interventional device-fixing head (103). The position where the core tube (101) is located between the guide head (102) and the interventional device-fixing head (103) is an installation segment (107) for positioning the interventional device, wherein the outer periphery of the installation segment (107) is provided with a tube wall-thickening layer (108). The delivery system comprises a sheath tube (200) and the sheath-core (100), which is placed inside the sheath tube (200) for delivering an interventional device. The sheath-core (100) for delivering an interventional device can prevent the emergence of a discount phenomenon of the delivery system during forward movement, thus being highly safe. The delivery system improves the controllability of the bending direction of the distal end of the sheath tube (200) and enables a doctor to conveniently bend and move the distal end of the sheath tube (200) towards a target direction or site via a traction wire (204), thus reducing the surgical difficulties.Linvention concerne un élément gaine-noyau (100) pour mettre en place un dispositif dintervention et un système de mise en place comprenant lélément gaine-noyau (100). Lélément gaine-noyau (100) comprend un tube central (101), lextrémité distale du tube central (101) étant fixée avec une tête de guidage (102) et une tête fixant le dispositif dintervention (103). La position dans laquelle le tube central (101) est localisé entre la tête de guidage (102) et la tête fixant le dispositif dintervention (103) est un segment dinstallation (107) pour positionner le dispositif dintervention, la périphérie externe du segment dinstallation (107) étant équipée dune couche épaississant la paroi du tube (108). Le système
