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   Catheter

   Benjamin Franklin invented a flexible Catheter for his brother who had a bladder stone.
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   Benjamin Franklin

   When denied the chance to write a letter to the paper for publication, Franklin invented the pseudonym of "Mrs. Silence Dogood," who was ostensibly a middle-aged widow. ... Among his many creations were the lightning rod, the glass harmonica, the Franklin stove, bifocal glasses, and the flexible urinary catheter.

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• Catheter,
• Benjamin Franklin