Highly dispersed Cu-base catalyst has been prepared via thermal decomposition of layered double hydroxides precursors. The XRD pattern and the HRTEM images of the as prepared catalyst confirmed the high dispersion of ...Highly dispersed Cu-base catalyst has been prepared via thermal decomposition of layered double hydroxides precursors. The XRD pattern and the HRTEM images of the as prepared catalyst confirmed the high dispersion of Cu and Fe ions. Results show that the catalyst has a relatively high selectivity of alkanes at low temperature.展开更多
Purpose Percutaneous ilio-sacral screw(ISS)insertion using conventional C-arm fluoroscopy has been a widely employed technique for pelvic posterior ring fixation,particularly in developing regions.However,this approac...Purpose Percutaneous ilio-sacral screw(ISS)insertion using conventional C-arm fluoroscopy has been a widely employed technique for pelvic posterior ring fixation,particularly in developing regions.However,this approach presents technical challenges,leading to a high malposition rate.We introduced a new method for ISS insertion without additional equipment or software and suggested whether it could reduce the malposition rate and operating time.Methods This is a retrospective cohort study.The study included all patients who underwent percutaneous ISS fixation between January 2020 and December 2022.Patients treated with open reduction or other types of implants were excluded.The patients were divided into 2 groups based on the screw insertion method:Group A utilized the traditional dual-plane adjustment method,while Group B received the newly introduced method.In all cases,conventional C-arm fluoroscopy was the sole guidance during the surgical procedure.Malposition rate,radiation exposure,and operating time were compared between groups.Post-operative CT scans were used to assess screw accuracy using the Smith grading method.The Student's t-test or the Mann-Whitney U test was chosen for comparing the quantitative variables based on the normality test results.The Chi-squared test was utilized for comparing qualitative variables.Results A total of 72 patients with pelvic posterior ring disruption treated with percutaneous ISS under conventional fluoroscopy guidance were included in this study.Among them,32 patients were in Group A and 40 patients were in Group B.In Group B,the average operation duration per screw was 33 min with 29 fluoroscopy applications,which was significantly lower than that in Group A(44 min,p<0.001,38 times,p<0.001,respectively).Furthermore,the post-operative CT scan revealed that only 10.7%(6/56)of screws in Group B were inappropriately positioned according to the Smith criteria.Conclusion The novel method introduced in this study demonstrated a reduction in both malposition rates and operating time compared to the traditional dual-plane adjustment method.Precise pre-operative CT planning in conjunction with conventional fluoroscopy could establish this method as a widely applicable technique for percutaneous ISS fixation.展开更多
文摘Highly dispersed Cu-base catalyst has been prepared via thermal decomposition of layered double hydroxides precursors. The XRD pattern and the HRTEM images of the as prepared catalyst confirmed the high dispersion of Cu and Fe ions. Results show that the catalyst has a relatively high selectivity of alkanes at low temperature.
基金supported by Ningbo Public Service Technology Foundation,China(Grant No.2022S063)Zhu Xiu Shan Talent Project of the Hospital(Grant No.2023HMJQ08)Medical Scientific Research Foundation of Zhejiang Province,China(Grant No.2019KY597).
文摘Purpose Percutaneous ilio-sacral screw(ISS)insertion using conventional C-arm fluoroscopy has been a widely employed technique for pelvic posterior ring fixation,particularly in developing regions.However,this approach presents technical challenges,leading to a high malposition rate.We introduced a new method for ISS insertion without additional equipment or software and suggested whether it could reduce the malposition rate and operating time.Methods This is a retrospective cohort study.The study included all patients who underwent percutaneous ISS fixation between January 2020 and December 2022.Patients treated with open reduction or other types of implants were excluded.The patients were divided into 2 groups based on the screw insertion method:Group A utilized the traditional dual-plane adjustment method,while Group B received the newly introduced method.In all cases,conventional C-arm fluoroscopy was the sole guidance during the surgical procedure.Malposition rate,radiation exposure,and operating time were compared between groups.Post-operative CT scans were used to assess screw accuracy using the Smith grading method.The Student's t-test or the Mann-Whitney U test was chosen for comparing the quantitative variables based on the normality test results.The Chi-squared test was utilized for comparing qualitative variables.Results A total of 72 patients with pelvic posterior ring disruption treated with percutaneous ISS under conventional fluoroscopy guidance were included in this study.Among them,32 patients were in Group A and 40 patients were in Group B.In Group B,the average operation duration per screw was 33 min with 29 fluoroscopy applications,which was significantly lower than that in Group A(44 min,p<0.001,38 times,p<0.001,respectively).Furthermore,the post-operative CT scan revealed that only 10.7%(6/56)of screws in Group B were inappropriately positioned according to the Smith criteria.Conclusion The novel method introduced in this study demonstrated a reduction in both malposition rates and operating time compared to the traditional dual-plane adjustment method.Precise pre-operative CT planning in conjunction with conventional fluoroscopy could establish this method as a widely applicable technique for percutaneous ISS fixation.
