Made of imported polymer materials, clear layers of skin and muscle, with integrated knee anatomical structure, and manifest body surface symbols
1. Can puncture repeatedly, standard puncture sites facilitate to acupuncture and there is realistic feeling when needle inserts into veins
2. A single valve can inject simulated liquid of bursa mucosa into bursa mucosa repeatedly
3. Automatic sealing of bursa mucosa
4. Skin surface can be cleaned by suds