Dialyzers for blood treatment and processes for production thereof
AssigneeToray Industries, Inc.
InventorsHidetoshi Kozawa, Hidekazu Nakashima, Shigehisa Wada
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Abstract
A dialyzer for blood treatment includes 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/min per 1.6 m2 or 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 as described.
Claims4
A dialyzer for blood treatment having incorporated therein a dry or semi-dry semipermeable membrane having a water permeation of 330 ml/hr/m2/mmHg or more before drying which comprises a polysulfonic resin and polyvinyl pyrrolidone in an amount of 1 to 10% by weight based on the content of the polysulfonic resin, the water permeating performance of the semipermeable membrane after drying being ½ or higher relative to that before drying, the dialyzer satisfying any of the following requirements:
- (A) the vitamin B12 clearance is not smaller than 135 ml/min per 1.6 m2;
- and
- (B) the amount of the hydrophilic polymer that is eluted from the semipermeable membrane is not higher than 10 ppm.
Dependencies are inferred from the claim text.