An aortic shunt comprising a second tubular member nested within a lumen of a first tubular member, wherein aortic blood flows through the lumen of the first tubular member and oxygenated andor cooled blood is infused through a lumen and distal port of the second tubular member to perfuse the cerebral vasculature. The surface carving is by a sandblasting process, which has long fragrance diffusing time and ability to change fragrance according to circumstances, so as to achieve an object of repeatedly using which is economical and environment-friendly, and prevent the perfume from contacting with the skin or clothes directly. Each MR element row is composed of a plurality of MR elements connected in series. The security system further includes an alarm for alerting a user when the protected item is moved.