Easy-to-control interventional instrument delivery device

A method for delivering an implantable device to a delivery site by a delivery device, wherein the implantable device comprises at least one connecting portion, and the delivery device comprises:

• a core tube,
• an outer sheath surrounding the core tube and movable relative to the core tube,
• a fixing head fixed on the core tube and having at least one positioning portion, and
• at least one bar having a movable distal end and a proximal end which is fixed with at least one of the core tube and the fixing head, and
• the delivery device having an initial state in which state the at least one bar is released from the outer sheath and the distal end of the at least one bar is further away from the core tube in a radial direction relative to the proximal end of the at least one bar, and a delivering state in which state the at least one bar is constrained by the outer sheath, and
• the implantable device having a loaded state in the delivery device and a completely released state from the delivery device, wherein, in the loaded state, the at least one bar maintains engagement between the at least one connecting portion of the implantable device and the at least one positioning portion of the fixing head under a constraint of the outer sheath, and in the completely released state, the implantable device is completely exposed out of the outer sheath,
• the method comprising:
• coupling the at least one connecting portion of the implantable device to the at least one positioning portion of the fixing head in the initial state and advancing the outer sheath to completely surround the implantable device,
• delivering the delivery device with the implantable device in the loaded state to the delivery site, and
• retracting the outer sheath until the at least one bar is released from the constraint of the outer sheath and thus moves radially and outwardly, thereby releasing the entire implantable device at the delivery site;
• wherein the positioning portion is configured as a positioning protrusion, the connecting portion is a connecting ear having a U-shape or an annular shape, and in the loaded state, the connecting ear surrounds the respective positioning protrusion.