Abstract: Objective To investigate the clinical value of a new dual-channel negative pressure aspirator in laparoscopic radical resection of rectal cancer. 
Methods A total of 102 patients who initially underwent laparoscopic radical resection of rectal cancer in our hospital were randomly divided into observation group (n=51)and control group (n=51) according to random number table. Patients in the two groups were operated by the same operation team. The conventional single-channel negative pressure aspirators were used in the laparoscopic resection of patients in control group, and new dual-channel negative pressure aspirators were used in the laparoscopic resection of patients in observation group. Continuous negative pressure suction of surgical smoke and excess CO2 in the body of patients during surgery was performed. The surgical smoke removal effect, operation condition, postoperative recovery and complication incidence rate were compared between two groups. 
Results The times of lens wiping in observation group were significantly decreased than those in control group (P＜0.05), and the quality of visual field in observation group was significantly superior to that in control group (P＜0.05). The digestive tract reconstruction time, duration of operation, intraoperative bleeding and ETCO2 after pneumoperitoneum creation in observation group were significantly lower than those in control group (P＜0.05). The postoperative drainage in observation group was significantly lower than that in control group (P＜0.05), and the first time of anal exhaust, the first time of off-bed activity, the duration of indwelling catheter and the length of postoperative hospitalization had the decreasing tendency, as compared with those in control group, showing no significant difference (P＞0.05). No significant difference was found in the total incidence of postoperative complications in control group and observation group (P＞0.05). 
Conclusion The application of dual-channel negative pressure aspirator in laparoscopic radical resection of rectal cancer has a good effect of eliminating surgical smoke, reducing the times of lens wiping and improving the quality of visual field, which is helpful to shorten the operation process without increasing postoperative complications incidence, and has a high clinical value.

Key words: rectal neoplasms, laparoscopy, dual-channel negative pressure aspirator