I propose a medical device to prevent the buildup of kidney stones, pancreatic duct stones, other calcification stones....

The device would need to be installed surgically (most likely using an endoscope) and then could either be manually triggered or automatically timed to help prevent and manage the buildup of stones before they become a problem.  The proposed device would, in theory, be used in people who have a known genetic predisposition to producing the stones (hence the automatic timer idea).