Wheelchairs are divided into ordinary wheelchairs and special wheelchairs. Special wheelchairs are derived from ordinary wheelchairs according to the function and purpose of wheelchair patients. Commonly used wheelchairs include standing wheelchairs, lying wheelchairs, single-side drive wheelchairs, electric wheelchairs and competitive wheelchairs. The structure of ordinary wheelchairs is generally composed of four parts: frame, wheels (big wheels and small wheels), braking device, chair and backrest.
As we know, the main load-bearing parts of wheelchair users are around hip ischial tubercle, femur, fossa and scapula.
The size of the wheelchair, especially the width and depth of the seat, the height of the backrest and the distance between the pedal and the seat cushion, will affect the blood circulation of the relevant parts of the occupant, causing skin abrasions and even pressure sores. In addition, we should also consider the patient's safety, operational ability, the weight of the wheelchair, the place of use, appearance and other issues.