MEMBRANE POUR LA PLASMAPHORESE, SON PROCEDE DE FABRICATION ET SA CONSTITUTION

LA PRESENTE INVENTION DECRIT UNE MEMBRANE POUR LA PLASMAPHORESE SOUS FORME DE FILAMENTS CREUX, DE FEUILLES SOUFFLEES OU DE FEUILLES PLATES FABRIQUEE SELON UN PROCEDE DANS LEQUEL UNE SOLUTION DE FILAGE A BASE D'ESTER CELLULOSIQUE EST PRESSEE A TRAVERS UNE FILIERE IMMERGEE DANS UN BAIN COAGULANT, EST LAVEE AVEC DE L'EAU EXEMPTE DE SOLVANT, IMPREGNEE AVEC UNE SOLUTION PLASTIFIANTE, PUIS SECHEE.APPLICATION DE CETTE MEMBRANE DANS LE DOMAINE MEDICAL PAR EXEMPLE. A process for the production of a membrane which comprises forcing a spinning solution comprising from 8 to 25%, by weight, of one or more cellulose esters, from 55 to 92%, by weight, of one or more solvents and optionally up to 20%, by weight, of one or more other additives through a spinning jet immersed in a precipitation bath, exposing the jet of solution to the coagulating effect of the precipitation bath at the boundaries of the jet over a section of precipitation bath which is at least 30 cm long, guiding the coagulated material out of the precipitation bath, washing with water until free from solvent, impregnating with plasticiser solution and drying is disclosed. The present invention also relates to a membrane which comprises distinct, substantially parallelepipedic closed cells juxtaposed to form a honeycomb-like structure all the cell walls having a plurality of holes as pores.