Title: Pleated artificial kidney

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Abstract: This disclosure relates to a transfer device, preferably in the form of an artificial kidney, which is formed of a continuous membrane film reversely folded or pleated so as to define sets of films with each set including two film layers and there being disposed between adjacent sets of film layers first spacers extending in the central area of the device and for a major portion of the length thereof, and second spacers between the films of adjacent sets of films at the ends thereof, the second spacers being spaced from the first spacers, and there being third spacers aligned with the second spacers, but each third spacer being between the two films of a set with the second and third spacers combining to define flow passages into and out of between the two films of the sets of films for a first fluid, and there being means for introducing a second fluid, at a lesser pressure than the first fluid, into the first spacers at the ends thereof with the films of each pair of films ballooning into the first spacer to define plural longitudinal passages which are generally distorted so as to provide for a maximum transfer between the first and second fluids on the opposite sides of each film.


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