传统的微导管有效的扭转方向是依赖可控的导丝。导丝的后端的旋转必需是one to one 传到弯曲导丝的头端。
Effective torque is generated by a steerable guidewire
Guidewires with "one to one” transmission
Lower in thinner versions due to thinner cores？
Steerable microcatheter 
- Manipulation with contrast injection ! 手动造影剂注射
- High stability with the dial rock 刻度盘. (Wire driving 导丝驱动)
Simple procedure without insertion and taking-off of guidewire. 简单操作不同插入并撤除导丝
Great innovation ! 大发明
Still, room for improvement.还有改进的空间
Tri-axial system with steerable microcatheter
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