Re: Now for the hard bit
If your kidney stones have made it to the bladder, they don't need treatment in general as they'll happily pass out of your urethra (tube from bladder to the outside). This is cos it is much larger than your ureters (tube between kidneys and bladder) in diameter. It's when stones are stuck here that there is pain. And using ultrasound to break them up is helpful, for the smaller ones (the larger ones it's too difficult and cold steel, aka surgery, is still indicated).
Is my understanding. Not a urologist though.