**2.2.2.2 Test of hemolysis rate of TiNi SMA after surfacely- modified**

8ml fresh rabbit blood selected was anti-coagulated with 1ml heparin solution, and diluted with 10ml physiological saline. The samples were put in 10ml physiological saline in the water bath at 37℃, then putting in 0.2ml dilution blood, mixing well gently, and continuing to keep the temperature for 60min. Then the fluid was poured into a test tube, separated at a speed of 1000r/min with LXJ-64-01 type of separator, and the up layer solution was taken out to test absorbance value at wave length of 545nm with Lambda 35 type of spectrophotometer. Anode control group used 10ml distilled water + 0.2ml dilution blood, and cathode one 10ml physiological saline + 0.2ml dilution blood. By the formula:

$$\alpha(\%) = \frac{D\_t - D\_{nc}}{D\_{pc} - D\_{nc}} \times 100\,\% \tag{2.1}$$

*Dt* : Sample absorbance; *Dnc* : Cathode control group absorbance; *Dpc* : Anode control group absorbance hemolysis rate was taken out.
