Clinical Study of Equivalent Doses of Oxycodone or Tegileridine on Patients Undergoing Gynecological Laparoscopic Hysterectomy

Inclusion Criteria: 1. Patients undergoing laparoscopic total abdominal hysterectomy with single-lumen endotracheal tube placement under general anaesthesia. 2. Females aged 18-65 years with a BMI of 18-28 kg/m²; 3. Normal mouth opening and head/neck mobility; 4. Preoperative American Society of Anesthesiologists (ASA) physical status classification of I-III and Mallampati airway classification of I or II; 5. Patients must also be scheduled for postoperative analgesia and have signed an informed consent form. Exclusion Criteria: 1. Patients with allergies to the medications used in this study. 2. Patients with severe diseases of major organs, such as the heart, lungs or brain, including a history of acute myocardial infarction, cerebral infarction, asthma or chronic obstructive pulmonary disease; 3. Patients with severe liver or kidney dysfunction, or concomitant severe endocrine disorders such as poorly controlled hypertension, diabetes, hyperthyroidism or hypothyroidism. 4. Patients with a difficult airway, oropharyngeal/cervical anomalies, or a history of prior tracheostomy; 5. A history of prolonged sedative/analgesic use, substance abuse or opioid dependence; 6. Patients with neuropsychiatric disorders or impaired communication/comprehension abilities.