OPINION
EASTERBROOK, Circuit Judge.
Sakharam D. Mahurkar, a physician, holds several patents on dual-lumen hemo-dialysis catheters. A dual-lumen catheter is a pair of tubes (lumens) designed to allow blood to be removed from an artery, processed in a machine that removes impurities, and returned close to the place of removal.
Hemodialysis catheters are used to palliate kidney failure. In the event of chronic failure...
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