Q | how does lithotripsy work?
A | The lithotripsy machine generates a shock wave using sound energy.
This energy can be focused and magnified using "acoustic lenses" which can be directed at your kidney stone, similar to how a magnifying glass can focus the suns rays to a point.
By focusing the sound energy in this manner, a shock wave can be produced at a point on the stone with enough power to shatter and fragment the stone.
Usually a large number of small shock waves are generated so that the stone can be fragmented without causing discomfort to the patient.