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Higher-strength waves or pulses are also used in lithotripsy, a common medical procedure to break up kidney stones.

Founded in 2009, Shockwave focuses on intravascular lithotripsy technology that uses sonic pressure waves to crack calcium lesions in arteries and restore blood flow.

Lithotripsy — using ultrasound to break up kidney stones — is a good thing, whether or not those stones could have been avoided by drinking eight glasses of water a day.

But a third measured 64.6 mm, a size that would rarely pass without treatment — the administration of ultrasound shock waves, called lithotripsy, designed to break up the deposit and allow it to pass.

Kidney-stone sufferers who have had their deposits broken up by lithotripsy might also consider a roller-coaster ride to finish the job, they said.