device for the transfer of the masses with a membrane semiimpermeabile willing to coil with low resistance to flow and volume of fluid

摘要

A mass transfer device such as an artificial kidney is disclosed which describes a foraminous screen member supporting and lying against a length of semipermeable membrane of flattened tubular shape. The screen member and membrane are arranged in a spiral about a core, the screen member comprising first and second sets of spaced parallel strands in separate planes. The sets of strands lie against each other and define an angle thereto, and are connected to each other at their crossing points. One of the sets of strands is disposed in longitudinal relation to the axis of the tubular membrane. The strands of the longitudinally arranged set have center lines which are spaced apart from each other by a distance which is preferably at least twice the corresponding spacing distance between the strands of the other set.