Final answer:
A lithotripter is an instrument used for surgically crushing bladder stones, employing high-intensity ultrasound pulses in a procedure called lithotripsy.
Step-by-step explanation:
An instrument used for surgically crushing bladder stones is known as a lithotripter. The procedure associated with this instrument is called lithotripsy, where high-intensity ultrasound pulses are applied externally to break apart the kidney stones, allowing them to pass more easily through the urinary tract. It is a preferable method among other treatments such as stent insertion or surgery, specifically for stones that cause a blockage, as it is noninvasive. However, patients should be aware that, despite its noninvasive nature, it can potentially cause damage to the kidneys.