What is the difference between a lumbar puncture needle and an epidural needle?

Lumbar puncture is actually the traditional name for subarachnoid puncture.

First of all, subarachnoid puncture mainly refers to an invasive examination procedure, which is clinically used to extract cerebrospinal fluid for relevant examination, but it can also be anesthetized by injecting local anesthetic drugs by subarachnoid puncture (also known as "subarachnoid block" or "lumbar anesthesia").

In fact, these two kinds of anesthesia are collectively referred to as intraspinal anesthesia. The anatomical levels in the spinal canal are ligamentum flavum, spinal dura, arachnoid and spinal cord. Between the ligamentum flavum and the spinal dura is the epidural space, and placing the anesthetic here is called epidural anesthesia. While there is an underlying anatomical gap between the dura and arachnoid membranes that is generally not clinically distinguishable, there is a gap between the arachnoid membranes and the spinal cord called the subarachnoid space. So one of the differences between these two types of anesthesia is the level of injection.

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