A weighted retractor is in the vaginal cavity .

阴道内有一个加了重量的牵引器。

Emergency locking retractor with higher resopnse threshold ( type 4n )

具有较高响应极限值的紧急锁止式卷收器（4n型）

Comparison of retraction pressure between novel and conventional retractor systems-a cadaver study .

新型牵开器与传统牵开器牵张压力的比较一项尸体研究。

I need to see more here . Retractor .

我要更多看下这里，牵引器。

Yuanyan brand cervical vertebra retractor designs according to physiological characteristics of human body , applying biological mechanics theory .

远燕牌颈椎牵引器根据人体生理特点，运用生物理论设计。