Abstract：Objective To investigate the clinical efficacy and safety of a modified ultrasonic lithotripsy probe(Patent No.ZL201720748836.9) in percutaneous nephrolithotomy for treatment of upper urinary high hardness calculi.Methods Sixty-eight patients with upper urinary calculi who were treated in our hospital from December 2017 to October 2018 were enrolled, including 9 cases of ureteral stones and 59 cases of kidney stones. The CT values of all stones were more than 1300 Hu.All patients underwent percutaneous nephrolithotomy(PCNL).Of them,34 patients underwent conventional lithotripsy probe of Beijing Huifukang ultrasonic pneumatic lithotripsy system(CQS-01) while 34 patients were performed by modified ultrasonic lithotripsy probe.Each group was compared in terms of the success rate,operation time, stonefree status,symptom-free status,blood loss, mean postoperative hospital stays and postoperative complications . All the data were analysed by chi-square test or t-test(P<0.05).Results There was no statistical difference between the groups for success rate,stonefree status and symptom-free status(P＞0.05). The operation time and hospitalization time per patient were (30.11±11.30)minutes and (4.30±0.14)days respectively in the modified ultrasonic lithotripsy probe group, while they were(40.50±10.31)minutes and (6.58±0.53)days in the conventional lithotripsy probe group(P<0.05).Conclusions The new ultrasonic lithotripsy probe in percutaneous nephrolithotomy is safe and effective in the treatment of upper urinary tract calculi.It can be preferentially applied to patients with high hardness upper urinary calculi.
