Features：
1. Accurate anatomical structure, include internal and external
humeral epicondyle, ulnar nerve, ulna, radius, elbow joint cavity, etc.
2. Golf elbow and tennis elbow treatment position
3. The elbow joint of the right arm is bent and can be
rotated along a fixed axis
4. Electronic monitoring: find the correct tenderness point, which
is indicated by a yellow light. When the puncture site is correct,
the corresponding indicator lights will be displayed on the control
box. When the needle enters the ulnar nerve located behind the
inner epicondyle of the humerus, the incorrect puncture is
indicated by a red light