Hemodialyzer

Details Hemodialyzer Hemodialyzer

B - Operations, Transporting

01

D

182/15

B01D 63/14 (2006.01)

Patent

CA 1102251

ABSTRACT OF THE DISCLOSURE This invention relates to small lightweight hemodialyzers having a high surface area to blood priming volume. Previously considerable dif- ficulty had been experienced in the production of small lightweight hemodialyzers, particularly with regard to obtaining consistently good ultrafiltration rates, high wet rupture strength, absence of leakage during clinical use, and absence of torn membranes during manufacturing. These and other difficulties of the prior art have been overcome according to the present invention. According to the invention, there is provided a hemodialyzer in which a sealant anchors the edges of a plurality of generally planar semipermeable membranes to a generally rigid case. The moisture content of the membranes is maintained at approximately a constant value so as to prevent stress from being built up in the hemodialyzer due to changes in the dimensions of the anchored membranes with changes in moisture content. A stack of semipermeable membrane material is confined between wedge blocks within the hemodialyzer case. The wedge blocks permit the hemodialyzer to be assembled without placing shearing stresses on the membrane. Also, by trapping the last pleats of the membrane between the case and the outer surfaces of the wedge blocks the last pleats are easily encapsulated with sealant and thus sealed.

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