Gambro Lundia Ab

Gambro Dialysatoren Kg

Gambro, Inc.

Claes-Ake Gullberg

Hermann Josef Gohl

Reinhold J Buck

Maria T Ohmayer

Gunther F Geiling

Peter Konstatin

Georg B Mayer

A membrane for hemodialysis is prepared by casting, extruding or spinning a solution of a polyether-polycarbonate block copolymer and a swelling agent having a molecular weight of about 1,000 to about 20,000 Daltons, then partially evaporating the solvent, gelling and washing. The membrane has a top cut-off value less than about 68,000 Daltons, and hence is substantially impermeable to albumin, but nonetheless provides high permeability to water and to other small molecules.

Membrane and process for producing the membrane

A filtration membrane is disclosed which has an ultrafiltration rate of between 200.times.10.sup.-4 and 500.times.10.sup.-4 ml/sec..times.cm.sup.2 .times.bar at 20.degree. C. and which is substantially impermeable to albumin of a molecular weight of about 44,000 or greater. A process for producing a filtration membrane is also disclosed in which a polymer solution is extruded with a center liquid under conditions such that the ratio of the volume of polymer solution to the volume of center liquid is within the range of from about 2:1 to about 4:1 to form a membrane extrudate.

Polyamide hollow fiber filtration membrane having barrier layer

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Lund, Sweden

Claes-Ake Gullberg