Still referring to FIG. 2, note that a power mask (PDN) is active for the entire multi-slot period.
仍然参考图2，注意在整个多时隙期间，功率屏蔽（PDN）始终是活动的。
2
In double lesion, anterior extraperitoneal approach in 3 cases, L4, 5 received intervertebral disk replacement and L5S1 received single PDN replacement.
双节段3例则采用前路腹膜外入路，L 4, 5进行人工椎间盘置换术，L5S 1行单枚人工髓核植入。
3
Objective To evaluate the clinical value of prosthetic disc nucleus (PDN-solo) replacement for lumbar disc herniation by comparing it with traditional solely discectomy.