Your answer is correct, This operation is called Lithotripsy.
Lithotripsy (stone breaking in Latin) is an extracorporeal medical technic that can fragment the calculus of kidneys with shock waves.
Generated by a lithotripter. The contact of the treatment head with the skin of the patient allows propagation and focus the shock waves on the calculation.It is thus reduced to tiny fragments, which will then be eliminated in the majority of cases. This elimination is through the urinary tract. There is no surgical opening.
Depending on the size, the resistance of your calculation and of the response to treatment, one or more sessions may be required.