Category: New Technology: Stones

MP5-10 - New generation of tip-flexible semirigid ureterorenoscope in the treatment of lower calyceal calculi

Fri, Sep 21
10:00 AM - 12:00 PM

Introduction & Objective : To compare the efficacy and safety of tip-flexible semirigid ureterorenoscope (tf-URS) of the second and third generations for the treatment of lower calyceal calculi, and investigate the effect of its structural improvements in the therapy.


Methods : Demographic characteristics, stone characteristics, surgery information and KUB results were retrospectively collected, and stone size >2 mm was considered to be residual. Double-J stents were placed preoperatively for all patients. During surgery of the second generation or third generation tf-URS, laser energy was set as high power and low frequency. Differences in therapeutic effect between both scopes were compared.


Results : 28 cases were treated with the second generation tf-URS (Group A) and 43 cases with third generation tf-URS (Group B). The success rate of access to ureter was 100% in both groups, in addition, success rate of stone localization in group A was 89.3% (25/28) and 95.3% (41/43) in group B. Stones of 8 cases in group A and 4 cases in group B weren’t able to be disintegrated in situ, necessitating removal of stones by basketing. There was no significant differences in surgery time between group A and B [(17.5 ± 7.6) min vs. (18.5 ± 7.1) min, p>0.05]. KUB of group A showed residual stones were found in 6 patients, with stone size >8 mm in 2 cases, and stone free rate (SFR) was 76.0%; residual stones of group B were found in 4 patients, with stone size ≤4 mm in all cases, and SFR was 86.0%. 2 cases of fever occurred in group A and 1 case in group B, showing no statistical significance (p>0.05). No complication of injury of ureter and pelvis, perforation and so on was encountered in both groups.


Conclusions :

It was safe and effective to treat lower calyceal calculi using tf-URS, notably, the third generation tf-URS incorporating passive flexibility improved the capability to reach lower calyceal calculi compared with the second generation, which was almost comparable with traditional flexible ureteroscope.

Xiaofeng Gao

Deputy director of department of urology
Shanghai Changhai Hospital
Shanghai, Shanghai, China (People's Republic)

Yonghan Peng

Chief doctor of department of urology
Shanghai Changhai Hospital
Shanghai, Shanghai, China (People's Republic)

Ling Li

Shanghai, Shanghai, China (People's Republic)

Min Liu

Shanghai, Shanghai, China (People's Republic)

Yinghao Sun

Principal of The Second Military Medical University, Academician of China Engineering Academy
The Second Military Medical University
Shanghai, Shanghai, China (People's Republic)