| abstract |
An orthotic support system is embodied as cooperating seat and back cushion elements for assembly into a wheelchair frame. These cushion elements are custom-fitted to the individual patient by injecting an incipiently reacting and foaming, fluorocarbon-blown polyurethane chemical system into the space between a rigid mold box and an elastic membrane which is fitted over the open face of the mold box and which is deformably engaged by the appropriate portions of the patient's torso. The foaming mixture is injected in predetermined excess volume and expands against the physical resistance of the patient's body where contact is made with the corresponding regions of the elastic membrane; and this forcible engagement produces selective densification of the foam where a high degree of body support is required. Elsewhere, the foam expands more freely and stretchably inflates the membrane to generate graduatedly less dense regions matably contoured to fit or partially embrace the patient. For body alignment purposes, specialized bolsters are integrally formed in the cushion elements. |