Features：
1. Adult arm, realistic blood vessels, including cephalic vein, basilic vein, median cubital vein, median forearm
vein and dorsal hand vein network
2. Skin and blood vessels are replaceable
3. Venipuncture
① transfusion, blood sampling, etc.
② Realistic feedback, correct puncture with a sense of empty, has blood backflow
4. Intramuscular injection to the deltoid muscle
5. Subcutaneous injection: lower margin of deltoid