A medical device (100) having a proximal end (110) and a distal end (120), configured to automatically expand from a contracted state, in which it is held within a delivery device, to an expanded state in the which is deployed from the administration device, to administer it in a target area within a body light, the medical device comprising: a tubular structure (130) comprising a plurality of braided threads (135), each braided thread comprising a proximal end (137) of thread and a distal end (138) of thread； a first terminal feature (140), which defines a proximal end (142) and a distal end (144), wherein the proximal end of the first terminal feature (140) substantially coincides with the proximal end (110) of the device, and is configured to receive and fix the proximal ends (137) of wire by the proximal end (142) of the first terminal feature (140), wherein the tubular structure (130) comprises: a portion (180) of expanded volume , close to the first terminal characteristic (140) and at the same end of the device as the first terminal characteristic； and a tapered transition portion (190), which extends between the expanded volume portion (180) and the proximal end (142) of the first terminal feature (140), in which, in the expanded state, the portion ( 180) of expanded volume of the tubular structure (130) defines a diameter (De) of expanded volume and a surface (182), substantially perpendicular to a central axis (A) of the device, and in which, in the expanded state, the tapered transition portion (190) defines a first transition diameter (D1) near the perpendicular surface (182) of the expanded volume portion (180), and a second transition diameter (D2) near the proximal end (142 ) of the first terminal characteristic (140), in which the first transition diameter (D1) is larger than the second transition diameter (D2), is smaller than the diameter (De) of the expanded volume, and is disposed between the second transition diameter (D2) and diameter (De) of t
