Abstract
Objective: To observation on Poly- Flexible Ureteroscopy(FURS) retrograde intrarenal surgery (RIRS) combined with ultrasound guided all seeing needle Microperc to treatment of Lower Pole Renal Calculi larger than 2cm stone with infundibulopelvic angle（IPA）less than 60 degrees.
 Method: From January 2016 to January 2017, 63 patients with IPA angle less than 60 degrees in our hospital were treated with Poly-FURS retrograde intrarenal surgery combined with ultrasound guided all seeing needle Microperc, the patients stone sized more than 2 mm and located in the lower-pole calyx were retrospectively reviewed. Multiple stones were found in 37 cases and solitary stones in 26. Male patients used 70cm Poly-FURS, and the female 42cm.The clinical data including the operation time, the amount of bleeding, the stone free rate(SFR), the incidence of postoperative complications.
 Results: The operation time was 30~60min, mean 45min, FURS lithotripsy time was 20~35min, ultrasound guided all seeing needle puncture time was 3~5min, and lithotripsy time was 8~12min. 48 cases mainly lithotripsy with FURS and 15cases with micro-Percutaneous nephrolithotomy(micro-perc), 3 cases of fever as postoperative complications, 2 cases of pain; In non blood transfusion patients. The postoperative hospital stay was 2~3 days, with an average of 2 days. Postoperative residual stones were observed in 3 cases(SFR 95.2%) and treated with ESWL after 2 weeks. The stone clearance rate was 98.4% (62/63)after one month.
 Conclusion: The results of our study demonstrated that Poly- FURS retrograde intrarenal surgery combined with ultrasound guided all seeing needle Microperc had a significant effect on the success rate of lower Pole Renal Calculi larger than 2cm.
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