spinal needle

基本解釋

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.
另一較複襍的因素是硬膜外針長度的變異，此種變異可影響到腰麻針突出硬膜外針的長度。
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.
本實用新型是一種改進的脊麻――硬膜外麻醉雙琯穿刺針，屬於毉療用介質(zhì)輸入導琯技術領域。
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.
硬膜外針很粗加上置琯的損傷，出血較多且很難避免，因此不作硬膜外是有道理的。