切割套管然后迅速转动穿刺针获取组织样本。
A cutting cannula then rotates quickly over the needle to obtain the tissue sample.
目前血管穿刺针无法判断外套管是否进入血管，穿刺后置入外套管成功率不高。
The current vascular puncture needle cannot judge whether an outer sleeve enters the blood vessel or not, and the success rate of inserting the outer sleeve after puncture is not high.
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