Ask for advice: How to locate the lumbar crypt puncture? Ask for advice?

Under strict aseptic operation, use a 16G puncture needle to operate according to the method of lumbar epidural puncture catheterization, pay attention to the needle tip slightly to the affected side, after confirming the success of the epidural puncture, adjust the oblique mouth of the needle tip to the affected side. Insert the epidural catheter so that the catheter follows the arc of the needle tip and enters the crypt of the affected side along the outer space of the epidural space. At this time, there may be anesthesia in the lower limbs of the affected side. After the catheter was withdrawn without blood and fluid, the experimental dose of 2% lidocaine was quickly injected from the catheter, and the expected effect of localized epidural block was observed after 5 to 15 minutes, and no signs of "spinal anesthesia" were given before treatment Drugs, finally withdraw the puncture needle and catheter and observe for 5-10 minutes. This is our method, there is a good method and I hope everyone will discuss it

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