State Key Laboratory on Integrated Optoelectronics;
Institute of Semiconductors;
Chinese Academy of Sciences;
Beijing 100083;
P.R.China;
University of Chinese Academy of Sciences;
Beijing 100049;
P.R.China;
Academy of Advanced Semiconductors and Intelligence Technologies;
Haining 314400;
P.R.China;
nerve root retractor; flexible sensor; force monitoring; lumbar disc herniation(LDH)surgery;