The development of alternative seating and mobility systems

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Abstract
Attempts to provide adequate seating and mobility for those with severe disability, have occupied a great deal of time and effort in recent years, making considerable demand on financial resources. Many difficulties remain, especially in relation to the control and containment of the body when the disabled person's own ability to stabilise posture is inadequate. The problems associated with seating in such cases are highlighted together with the inevitable consequences when these are unresolved. An outline of pertinent structural and mechanical factors influencing stability of posture is given. The implications of such factors for design are considered in conjunction with the problems encountered, leading to suggested body postures which satisfy design criteria. The design and development of seating and mobility systems compatible with the desired positions is set out in some detail. The Putney AP chair and the Super SAM are products which, it is thought, will help to resolve some of the enormous difficulties presented by the severe motor impaired individual.