1.  Good performance of dynamic sealing. It can bear pressure is greater than 37 mmHg, clinical required 8~15mmHg;

2.  Resistance of plugging and pulling is very small. Dynamic test data is less than 3.2N/mm, similar imported brands less than 3.2N/mm;

3.  Drag reduction structure of plum membrane flap valve, lower resistance of plugging and pulling;

4.  Puncture cone head has cutting edge with six-sided knife type blade;

5.  Puncture cone universal orientation, without directional insertion.