This study is a randomized, double-blind, placebo-controlled, parallel-group clinical trial. To preliminarily evaluate the safety and efficacy of KHN702 tablets in moderate to severe post-operative pain patients.
Subjects between the ages of 18 and 75 years, inclusive.
Body mass index (BMI) of 18.0 to 30.0 kg/m2, inclusive.
Patients scheduled for surgery.
According to the researcher's medical judgment, American Society of Anesthesiologists (ASA) classification≤Grade II.
Participants experiencing acute or chronic pain unrelated to the surgical site, which the investigator deems may confound the participant's assessment of postoperative pain.
History of significant cardiovascular or cerebrovascular disease;
Severe respiratory disease history;
Severe Neurological and Psychiatric disease History;