Abstract: The closing plug and the closing plug device are used for closing a body defect percutaneously. During the insertion into the defect, the closing plug can be deformed to a smaller size to facilitate the insertion operation and recovered to its original larger shape after it is fitted to the defect, to thereby close the defect. The closing plug device facilitates the insertion of the closing plug into the defect. The closing plug has a flange or an enlarged portion at least at one end thereof and is made of a shape memory polymer having a shape recovery temperature in the range of 20.degree. C. to 70.degree. C. The closing plug device comprises a closing plug, a catheter and a guide wire or a pushing wire to aid in insertion of the closing plug to a defect.

Abstract: A thromboresistant segmented polyetherurethane compound wherein the polyether segment consists of 99 to 1% by weight of (a) a polytetramethylene ether segment having a number average molecular weight of 200 to 5,000 and 1 to 99% by weight of (b) a polyalkylene ether segment having a number average molecular weight of 200 to 5,000 in which the alkylene group has 2 or 3 carbon atoms, said segments (a) and (b) being contained in the same main chain. The segmented polyetherurethane compound is produced by a process comprising reacting 99 to 1% by weight of a polytetramethylene ether diol having a number average molecular weight of 200 to 5,000 and 1 to 99% by weight of a polyalkylene ether diol having a number average molecular weight of 200 to 5,000 in which the alkylene group has 2 or 3 carbon atoms, with a polyisocyanate compound, and reacting the resulting prepolymer with a chain extender.

Abstract: A wound dressing having a porous layer with a good affinity to tissue of organisms comprising (a) a first layer to be placed on the wound surface having pores of 20 to 500 .mu.m in diameter, and 1 to 10 mm thick, and (b) a second layer remote from the wound surface having pores not more than 20 .mu.m in diameter, and 0.5 to 5 .mu.m thick. The first layer can be provided with an antimicrobial of not more than 50% by weight, and the second layer can contain an antimicrobial of 10 to 80% by weight.

Abstract: A process for the dry distillation of used rubber in a fluidized bed-forming oven comprises heating used rubber under agitation in the presence of solid particles to temperatures sufficient to make the rubber pulverized and further heating the thus-obtained rubber particles to temperatures sufficient to pyrolyze the rubber particles while forming a fluidized bed thereof and burning a part thereof in the stream of an oxygen-containing fluidizing gas.