Ellipses in Real Life - Lithotripter

Lithotripters are used for pulverizing kidney stones non-evasively using shock waves. 
Source: Algebra and Trigonometry: Graphs and Models (5th Edition) by Bittinger, Beecher, Ellenbogen, and Penna
– Chip Rollinson

Information: Ellipses in Real Life - Lithotripter