When 500 far-out medical investigators gathered in Chicago last week for the annual meeting of the American Society for Artificial Internal Organs, they spent much of their time discussing something that is far too big ever to be implanted as an internal organ: the artificial kidney. And the biggest news about it was a plan to make it still bigger, so that a machine that is now about the size of a home washing machine will take on the dimensions of a laundry. It will also, its developers hope, wash out the metabolic...
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