Dear sir, there is any chance to left some parts of instruments using for stent removal. My kidney stent is removed in December, from December every one month frequency I am feeling something prick in my left side back, all the test is normal like, urine culture, ncct kub, ultra sound, creatinine test, blood test etc.doctor is saying it's your misconception, after taking antibiotics it is clear, after one month same problem. Actually I got my kidney stone lithotripsy surgery Please suggest sir.