An interventional medical closure device (300) is suitable for assisting closure of an opening through a blood vessel wall after completion of an interventional procedure within the internal lumen of the blood vessel. The device (300) comprises a closure element, a grasping element (302) for grasping the closure element, and a delivery element (304) for delivering the closure element into the internal lumen of the blood vessel. The closure element comprises a suture, and an engagement foot at a distal end of the suture. The grasping element (302) is inter-engageable with the closure element to grasp the closure element. The delivery element (304) comprises a main body portion, and a distant nose (314). The distal nose (314) defines a reception space for carrying the engagment foot of the closure element. The delivery element (304) also comprises an engagement foot (316) which is movable relative to the main body portion between a low-profile delivery configuration and a protruding engagement configuration.
