Clinical application of flexible ureteroscopic sheath with controllable intraluminal pressure in treating ureteral stones

Objective:The purpose of the study was to assess the clinical efficacy and safety of a combined perfusion suction platform with pressure feedback control function and an ureteroscopic suction sheath that can measure the ureteropelvic pressure in implementing lithotripsies.Methods:Fifty-two patients who underwent lithotripsy under intelligent monitoring of ureteral intraluminal pressure from June 2016 to January 2018 were retrospectively recruited.The inclusion standard was stone diameter>1.5 cm but<2.5 cm.After the 12/14 Fr suction sheath was placed,manometer interface and suction interface of the sheath were connected to the platform via the pressure sensor and suction tube,respectively.The ureteroscope was connected to the platform perfusion pump,and the crushed stones were aspirated out under negative pressure.Results:According to the location of the stone,21(40.4%)cases were classified as upper ureteral stones,19(36.5%)were midureteral stones,and 12(23.1%)were lower ureteral stones.Forty-seven patients underwent successful primary sheath placement and lithotripsy with a mean operative time of 34.5(standard deviation 18.3)min.Retrograde stone migration did not occur.There were eight patients with hematuria postoperatively.Serious complication was 1.9% with one case of ureteral perforation.Stone clearance was 95.7% at Day 1e2 postoperatively,and 100% at Day 30 postoperatively.Conclusion:Ureteroscopic lithotripsy with intelligent pressure control using our device improved the efficiency of the lithotripsy and rate of stone clearance.The safety of the operation can be ensured.It is worth popularization and application in clinical practice.

Effects of Exogenous Nutrient Additions on Azodye Wastewater Treatment

Since the azo dyes widely used in textile-dyeing industry are toxic,highly persistent,and ubiquitously distributed in the environment,their treatment efficiencies and fade in ecosystems have received worldwide attention.Due to the microbes play important roles in azo-dye degradation,exogenous nutrient addition is used as a promising biostimulation strategy to improve the treatment efficiencies of azo-dye wastewater.However,little is known about the effects of different kinds of exogenous nutrients on the azo-dye wastewater treatment directly.Here,three kinds of common nutrients,glucose,starch and yeast extract,were added to the sequencing batch reactors(SBR)for the treatment of wastewater containing acid red 73 to compare the biostimulation efficiencies by investigating the dye's removal efficiencies and the changes of related water qualities.Our results showed that the reactors added yeast extract had highest removal efficiencies and chemical oxygen demand(COD)as well,followed by glucose and starch.The removal rates of acid red 73 and COD were 90.63%and 87.3%in the reactors added yeast extract,respectively,while 86.49%and 78.4%in those with glucose and 85.38%and 75.2%in those with starch.This study provided some useful information for the biostimulation strategy of azo-dye wastewater treatment and preliminarily suggested that yeast extract would be the optimal choice.