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Ni-Ti shape memory alloy, is “a living alloy", with "biological" nature. Placed in the human body, can resist the corrosion of secretion , and non-toxic, for any steriliz ation methods are adapted. So it is widely used in the system of medical equipme nt, artificial hip, knee, shoulder joint, skull, active heart valve, bone clip. Compatib ility well with the human body, in the medical field is called "biological memory mat erial". The company for the blood vessels and blood flow unreasonable situation of elderly, in the medical field use micro-titanium alloy implanted into the blood vessels of body , the use of it in a certain temperature changes in shape, the blood ve ssels can be washed up, so that make the blood smooth flow, Reduce the other cardiovascular diseases caused by blood clogging.