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Ergonomic principles

Jianlian Homecare Products Co.,Ltd | Updated: Sep 12, 2018

When riding in a wheelchair, it is important to maintain good posture, so that you can operate comfortably and conveniently. Fitting the size of the wheelchair and its parts to the user's body is a prerequisite for this. Generally speaking, the selection of wheelchair should consider the following aspects:

A.The Seat Height is usually 45-50cm.

The seat is too high and the wheelchair can't get under the table. The height of the seat and the pedal are in harmony with each other. Generally, the pedal should be kept at least 5cm away from the ground for safety and passability , and the appropriate height of the seat should make the user about 4cm higher than the front edge of the seat cushion at 1/3 of the lower part of the thigh and about 2 fingers wide.

B. The Seat Width is usually 40-46cm.

The width of the seat refers to the distance between the armrest panels on both sides of the wheelchair. The user should leave a 2.5cm gap between each leg and the armrest after using the wheelchair. When the seat is too wide, the wheelchair can not pass through the narrow aisle, the user is not easy to maintain balance, wheelchair easy to operate, physical fatigue. If the wheelchair is too narrow, the hip and thigh tissues will be under pressure, which will wear the user's skin and the outer thigh skin.

C. The Seat Depth is usually 41-43cm.

The depth of the seat is the distance between the back of the wheelchair and the leading edge of the seat. The correct depth is that the front edge of the seat cushion is 6.5cm from the back of the knee, about 4 fingers wide. If the seat path is deep, it will press the blood vessels and nerve tissue and wear the skin after the knee. If the seat is too short, the pressure on the hips will increase, causing discomfort, pain, soft tissue damage and pressure sores.

D. The Armrest Height is usually 22.5-25cm.

The user sits on the measuring chair with the upper arm hanging down naturally and the elbow joint buckling 900. The distance from the elbow lower edge to the chair surface is measured, and 2.5cm is the height of the armrest. The handrail is too low, the user has a tendency to fall, lose the stability of the body, reduce the expansion of the chest ability, make the body in a long-term forward leaning state, thus leading to the deformation of the spine. If the handrail is too high, the shoulders are easy to be tired, and pushing the wheelchair ring can easily cause skin abrasions on the upper arm.

E. The Backrest Height is usually 22.5-25cm.

Usually, the upper edge of the back should be about lOcm under the armpit. The higher the back, the more stable the upper body, and the lower the upper body and upper limbs, the larger the range of activity, but the smaller the supporting surface, affecting the balance of the body. During the inspection, four or five fingers can be inserted between the user's armpit and the top of the back.

F. Rear Wheel
The wheels are typically 20 inches, 22 inches, 24 inches and 26 inches, with both pneumatic and solid tires. The inflatable tyre has good elasticity and can cushion vibration. The solid tyre is strong but has poor shock absorbency. The wheelchairs used by lower limb amputees have to be moved about 8cm back for balance.

G. Front Wheel
The general specifications are 5 inches, 6 inches, 7 inches and 8 inches. The big wheel travels smoothly but turns aroundmuch larger and less flexible, the small wheel turns flexibly but encounters the road surface not usually vibrates obviously.

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