1. Anatomical focus: According to the main joint names affected by the splint, it is divided into wrist, palm, inter-finger, thumb, and finger categories.
2. Movement direction: According to the position or movement direction of the most important joint affected by the splint, it is divided into flexion, extension, radial lateral deviation, ulnar lateral deviation and other categories.
3. Main purpose: According to the main purpose of using the splint, it is divided into braking, restrictive and active.
4. Included secondary joints: It is divided into categories of type 0, type 1, type 2, type 3, etc. according to whether the number of secondary joints continuous with the main joints in the longitudinal axis direction and the number of secondary joints are included.
