Features：
1. Adult waist model, include posterior superior iliac
spine, arch of lumbar vertebra, etc
2. Allow sitting or lateral position puncture position
3. 1st lumbar for observation, 3rd–5th lumbar are functional part
4. Spinal canal anesthesia
5. Diagnostic puncture and treatment puncture
6. Realistic feedback of absence of resistance when penetrating
yellow ligament, cerebrospinal fluid flow out upon correct
puncture