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段落1

This is Scientific American 60-Second Science. I'm Cynthia Graber. Got a minute?

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Medical devices like implanted arteries or external dialysis machines keep people alive.

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But persistent problems exist.

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Blood flowing through the tubes can form dangerous clots.

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And bacteria that stick to surfaces could start infections.

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Treatment for patients using such devices thus often includes anti-clotting agents such as heparin.

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But such substances have their own risk: by interfering with clotting, they can cause potentially deadly bleeding.

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Recently, researchers at the Wyss Institute for Biologically Inspired Engineering at Harvard University looked to the carnivorous pitcher plant for guidance.

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The plant's structure includes wells with surfaces too slippery for insects to crawl out of.

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Those surfaces inspired the development of a coating so slippery that it prevents blood and bacteria from sticking.

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The team tested the coating on the interiors of tubes and catheters attached to pigs.

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They demonstrated that the coating did not degrade, and that blood kept flowing without clotting, for eight hours.

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Blood usually starts to clot in tubes in an hour.

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The study is in the journal Nature Biotechnology.

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The researchers also tested whether a gecko could latch onto the coating with its notoriously sticky footpads.

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But not even the gecko could get a grip.

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Thanks for the minute, for Scientific American's 60-Second Science. I'm Cynthia Graber.

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