Lithotripsy Machine (image) Duke University Caption Modern lithotripsy machines used to break apart kidney stones have been declining in efficiency for decades. Duke engineers have just modified the shock wave lens to improve treatment. Credit Siemens Healthcare Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.