Background: The biggest problem in routine hemodialy-sis therapy is possibly the blood pressure fall experienced by patients during dialysis. In contrast, in medium- and long-term hemodialysis therapy, the main problem might be deterioration of arteriosclerosis because of medial calcification associated with dialysis vintage. Both problems are caused by an autonomic imbalance or structural change in the blood vessels. Inflammation due to extra-corporeal blood circulation is another possible cause. This inflammation is considered to cause platelets activated by contact and adherence with the membrane surface to aggregate with white blood cells and attack the endotheli-um of the blood vessels. Therefore, we tried to develop a new membrane with no adsorption and no platelet activation. Summary: Polysulfone (PS) membranes with polyvi-nylpyrrolidone (PVP) as a hydrophilic agent are widely used in dialysis, but blood components adhere to the membrane surface. We developed a new dialyzer, NV, by localizing a new hydrophilic polymer onto the inner surface of a hollow-fiber membrane composed of PS and PVP. The number of platelets that adhered to the NV membrane surface drastically decreased to 0.9% of that with the conventional PS dialysis membrane. We also confirmed the mechanism by which NV realizes clinical improvements in blood pressure drops and inflammation during dialysis, and verified its clinical appeal. Key Mes-sages:The new membrane NV, which inhibits platelet adhesion and is compatible with blood vessels, is clinically beneficial.
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