Faced with a common postoperative problem, preventing thromboemboli (blood clots) without using blood thinners, Dr. Lazar Greenfield had to look outside of healthcare for a solution. He considered filters, but the only filters used up until that time tended to create more problems than they solved. Flat screen filters would only add to venous obstruction and provide a nidus for more thrombus – creating a situation every bit as serious as the one it was intended to prevent.
So, where could Dr. Greenfield look to find a workable design for his intravenous filter?
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