Fig. 4From: Application of a new body surface-assisting puncture device in percutaneous transforaminal endoscopic lumbar discectomyApplication of the body surface-assisting puncture device during surgery. A, B The iron positioning grid was used to locate the puncture point. C To measure the vertical distance between the midpoint of the posterior upper margin of the lower vertebral body to skin on the CT cross-section. D Adjust the height of the body surface-assisting puncture device according to the measured distance to determine the puncture path, then the anesthesia was infiltrated layer by layer. E Use the needle to puncture to the target point through the body surface-assisting puncture deviceBack to article page