Liquid purification or separation – Filter – Material
Reexamination Certificate
2005-11-01
2005-11-01
Walker, W. L. (Department: 1723)
Liquid purification or separation
Filter
Material
C210S500100, C210S500240, C210S500410, C210S500420
Reexamination Certificate
active
06960297
ABSTRACT:
A dialyzer for blood treatment including a semipermeable membrane which is made of a hydrophobic polymer and a hydrophilic polymer, and has a water permeating performance drying of ½ or higher relative to that before drying. The dialyzer has a vitamin B12 clearance not smaller than 135 ml/mm per 1.6 m2or the amount of the hydrophilic polymer eluted from the semipermeable membrane is not higher than 10 ppm. A dialyzer for blood treatment is light-weight, easy to handle, and exhibits a reduced elution of the hydrophilic polymer procedures for producing a dialyzer containing the semipermeable membrane and a process for producing a hollow fiber membrane for use in blood treatment are described.
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Kozawa Hidetoshi
Nakashima Hidekazu
Wada Shigehisa
Menon Krishnan S.
Nixon & Vanderhye P.C.
Toray Industries Inc.
Walker W. L.
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