Clinical study of buccal acupuncture for postoperative analgesia of mixed hemorrhoids

INTERVENTION: Experimental group:Buccal acupuncture+PCIA;Control group:PCIA; CONDITION: Postoperative analgesia PRIMARY OUTCOME: visual analogue scale score;Pressing times of analgesic pump;numerical rating scale; SECONDARY OUTCOME: VOMIT;headache; INCLUSION CRITERIA: (1) All patients who meet the diagnostic criteria for III and IV degree mixed hemorrhoids need surgery; (2) The age range is 20‐60 years old, male or female patients are not limited, and the course of disease is 1‐10 years; (3) The surgeon in charge of the operation is the same senior physician, and the operation methods are external stripping and internal ligation, and the anesthesia methods are ultrasound‐guided sacral anesthesia. Patients who voluntarily cooperate with postoperative pain treatment of hemorrhoids are listed as the research objects; (4) No other serious complications; (5) Patients with clear consciousness, informed consent, cooperation with examination and adherence to treatment; (6) those who signed the informed consent form for entering the research;