外套管表面有焊接缝。
喷管插在一个外套管上并可在外套管中伸缩，外套管上设置有把手。
The nozzle is inserted into an outer sleeve and can be retracted into the outer sleeve, and the outer sleeve is provided with a handle.
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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