1. Title: Effect of Transcutaneous Acupoint Electrical Stimulation on postoperative spontaneous voiding for Laparoscopic Cholecystectomy patients：A Randomized Clinical Trial 2. Research center: Multicenter 3. Design of the research: A randomized, double-blind and parallel controlled study 4. Object of the research: Patients （40≤age\<75 years）planing to elective laparoscopic cholecystectomy under general anesthesia without preoperative placement of catheter. 5. Sample size of the research: A total of 1,200 patients,600 cases in each group 6. Interventions: The acupuncture points for Transcutaneous Acupoint Electrical Stimulation(TAES) are Zhongji ( CV3),Guanyuan ( CV4),Sanyinjiao ( SP6) and Ciliao ( BL32) points . In treatment group patients are treated with low-frequency pulse electroacupuncture stimulation apparatus (HANS G6805-2, Huayi Co, Shanghai, China) at bilateral of SP6 and BL 32 points during the operation,and treated with a similar method at CV6 and CV4 acupoints for 45 minutes in postanesthesia Care Unit. Each devic is connected and maintained after "Deqi". Participants in the control group received nonacupoints (located 1 inch beside acupoints) and avoided manual stimulation and no "Deqi" without actual current output. 7. Aim of the research: Evaluate the effect of TAES on the postoperative spontaneous voiding in patients for Laparoscopic Cholecystectomy (LC ). 8. Outcome：Primary outcomes: The time of the first spontaneous voiding after surgery . Secondary outcomes: symptoms of postoperative voiding, the incidence of Postoperative dysuria,postoperative catheterization rate, catheterization time, incidence of related complications,as well as the effects on postoperative NRS pain and sleep quality scores etc. 9. The estimated duration of the study：2 years.
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The first spontaneous voiding after surgery
Timeframe: an average of 1 year