By dilating ureter, ureter peristalsis is promoted and stones are discharged. According to Dr. Chun Yu's information, the principle of Bremeca Lithotripsy is to promote ureteral peristalsis by dilating ureter, thus promoting the discharge of stones. Because the ingredients in Bremeca's calculus-expelling agent can react chemically with the substances in the calculus, so that the calculus can be decomposed into soluble substances, thus promoting the calculus to be discharged.