Ask for advice: how to locate the lumbar lateral recess puncture, ask for advice?

Under strict aseptic operation, use a 16G puncture needle to operate according to the method of lumbar epidural puncture, pay attention to make the needle tip slightly deviated to the affected side, and after confirming that the epidural puncture is successful, adjust the oblique opening of the needle tip to face the affected side. The epidural catheter is inserted, and the catheter is inserted into the recess on the affected side along the curvature of the needle tip along the lateral space of the epidural space. After withdrawing the catheter without blood and blood, the experimental dose of 2% lidocaine was rapidly injected from the catheter, and the expected localized epidural block effect was observed after 5-15 minutes, and there was no sign of "spinal anesthesia". Drugs, finally withdraw the puncture needle and catheter and observe for 5-10 min. This is our method, there is a good method and I hope you can discuss it

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