title: The application of a patented system to minimally invasive percutaneous nephrolithotomy.
abstract: OBJECTIVE
  To investigate the clinical effect of minimally invasive percutaneous nephrolithotomy (MPCNL) using a patented irrigation and clearance system.
  
  
  METHODS
  From August 2008 to August 2009, 60 patients with renal stones ≥2.0 cm were randomly assigned to two groups. Group 1 included 30 patients who were treated by MPCNL through a patented 16F sheath with the aid of a patented irrigation and clearance system combined with a high power holmium laser. Group 2 included 30 patients who were treated by a third generation EMS ultrasound/ballistic trajectory lithotripsy and clearance system through a standard 24F sheath. The differences in (1) average time needed for stone clearance; (2) percentage of cases in which one surgery resulted in freedom from stones; (3) mean renal pelvic pressure; and (4) mean amount of intraoperative bleeding were compared.
  
  
  RESULTS
  Compared with the EMS ballistic trajectory/ultrasound lithotripsy and clearance system, the MPCNL irrigation and clearance system had a significantly higher percentage of stone-free outcomes after one surgery and a lower amount of introperative bleeding (P<0.05). There was no difference in mean stone-clearance time and mean renal pelvic pressure (P>0.05). When comparing the cases with one percutaneous tract in the patented system group with the cases with one percutaneous tract in the EMS system group, the findings were similar.
  
  
  CONCLUSIONS
  The patented MPCNL irrigation and clearance system is safe and highly efficient in managing renal stones.
authors: Department of Urology, Ganzhou People's Hospital , Ganzhou, Jiangxi, China. slm631@tom.com
authors: Leming
authors: L
authors: Song
authors: Zhiqiang
authors: Z
authors: Chen
authors: Tairong
authors: T
authors: Liu
authors: Jiuqing
authors: J
authors: Zhong
authors: Wen
authors: W
authors: Qin
authors: Shulin
authors: S
authors: Guo
authors: Zuofeng
authors: Z
authors: Peng
authors: Min
authors: M
authors: Hu
authors: Chuance
authors: C
authors: Du
authors: Lunfeng
authors: L
authors: Zhu
authors: Lei
authors: L
authors: Yao
authors: Zhongsheng
authors: Z
authors: Yang
authors: Jianrong
authors: J
authors: Huang
authors: Donghua
authors: D
authors: Xie
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D007668:Kidney / Q000000981:diagnostic imaging / Q000601:surgery; D008096:Lithotripsy; D008297:Male; D008875:Middle Aged; D019060:Minimally Invasive Surgical Procedures / Q000379:methods*; D009403:Nephrostomy, Percutaneous / Q000379:methods*; D010330:Patents as Topic; D011859:Radiography; D014513:Ureter / Q000000981:diagnostic imaging; D001743:Urinary Bladder / Q000000981:diagnostic imaging; D055815:Young Adult