RIGID SUPPORTING BANDAGE

摘要

1508695 Laminates P ESCHMANN 11 March 1976 [14 March 1975] 09765/76 Heading B5N A rigid bandage consists of a base layer 7 of three plies 8, 9, 10 of textile applied over the skin 11 of a body part 12, a self-curing prepolymer material being applied over the base layer and penetrating ply 10 to form a hard plastics outer layer, plastics cannulae 13, placed along or around the body part between plies 8 and 9 being withdrawn after hardening of the outer layer to form ventilation channels. Nylon threads 16, 17 may be pulled to tear open the outer layer for removal of the bandage or conductive wire connected to a current source used as a thermal saw. A plastics window 26 may contain a card giving patient information, and an outer sleeve be applied over the plastics before it cures to shape the bandage. The cannulae may be replaced by stiff helical plastics coils and the prepolymer in'this embodiment may penetrate through both plies 9 and 10. In a further embodiment the base layer is formed of only two plies and the prepolymer penetrates a predetermined amount through the outer ply. In a modification the ply 10 has a wider mesh than the plies 8 and 9, and the outer layer is provided by the prepolymer wholly absorbed by the outer layer, or additionally by partial penetration also into ply 9. The plies may be made of cotton or an artificial fibre and the threads 16, 17 retained by adhesive tape. The outer layer may not extend for the whole length of the bandage and padding may be inserted between the plies. An example of prepolymer material consists by weight of: Component A.-360 g. of a mixture of 81À5% of branched polyol from the sorbitol group (OH number 490) and 18.5% of fluorotrichloromethane. Component B.-3À6 g. of a tertiary amine accelerator. Component C.-400 g. of a mixture of 80% of 2,4-diisocyanato-toluene and 20% of 2,6. diisocyanato toluene as the prepolymer component in 28% strength sorbitol. Other examples of prepolymer are given in the Specification. Additives in the prepolymers may be used as adjuvants, stabilizers, activators, inhibitors, anti-static agents, elastomers, radiation protectors, curing agents, plasticizers and anti-aging agents.