spinal needle

基本解释

A further complicating factor is variability in the length of epidural needles, which can vary the amount of spinal needle protruding beyond the end of the epidural needle.
另一较复杂的因素是硬膜外针长度的变异，此种变异可影响到腰麻针突出硬膜外针的长度。
The utility model relates to an improved double-tube puncture needle for spinal analgesia and epidural anesthesia, which belongs to the technical field of a medium inputting tube for medical use.
本实用新型是一种改进的脊麻――硬膜外麻醉双管穿刺针，属于医疗用介质输入导管技术领域。
ip.com
Because they do spinal with only a 25G needle, which is so slim that even puncture of vessel doesn't result in much bleeding.
硬膜外针很粗加上置管的损伤，出血较多且很难避免，因此不作硬膜外是有道理的。