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Specialized hollow fiber membranes for plasmapheresis and ultrafiltration

  • US 20070023353A1
  • Filed: 04/14/2006
  • Published: 02/01/2007
  • Est. Priority Date: 04/13/2000
  • Status: Active Grant
First Claim
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1. A plasmapheresis and/or ultrafiltration membrane comprising:

  • a plurality of elongated hollow fibers each fiber having an outer wall, an inner wall and an interior lumen extending along the length thereof, and characterized by having an average elongation breaking force strength of at least about 0.2 lbs. and an average elongation of at least about 45%, and wherein the fiber wall structure is a continuous change in mass density from said outer wall to said inner wall and comprises a continuum of voids bounded by solid frames, said fiber wall having a plurality of zones between inner and outer wall surfaces, each of said zones having a mass density different than the mass density of an adjacent zone, said fiber wall having a lower mass density zone at the inner wall surface and a higher mass density zone at the outer wall surface, said fibers capable of separating blood plasma and toxins from whole blood within a blood vessel by passing the plasma and toxins through said fiber wall from the outer wall surface to the interior lumen.

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