(1) the chemically inert ª¤ will not react with body fluid contact;
(2) on the human organism does not cause inflammation and foreign body reaction;
(3) does not cause cancer
(4) Allergic allergic reaction will not occur;
(5) have good blood compatibility, no hemolysis without coagulation;
(6) long-term implanted ª¤ nor loss of tensile strength and elasticity, physical and mechanical properties;
(7) can withstand necessary disinfection measures without distortion;
(8) easy to process into the needs of complex shapes.