Objective:To investigate the importance and the clinical efficacy of the establishment of the channel in the treatment of minimally invasive percutaneous nephrolithotomy (mPCNL)for upper urinary tract calculi. Methods: From March 2007 to November 2008, 500 cases (570 kidneys) of mPCNLfor the treatment of upper uri nary tract calculi were reviewed. All patients were treated in F~6 puncture channel percutaneous nephrolithotomy, of which 425 cases treated in single-channel, 75 cases in multi channel. Results:There were 570 kidneys using one...