Efficacy and Safety of Remimazolam Tosylate for Sedation in Gastroscopy

Inclusion Criteria: \- 1)18≤age≤60 years old, no gender limit; 2) Patients receiving routine gastroscopy diagnosis and treatment; 3) ASA score is I or II; 4) 18 kg/m2\<BMI\<28kg/m2； 5) It is estimated that the operation time of gastroscope will not exceed 30 minutes; 6) Clearly understand, voluntarily participate in the research, and be signed and informed consent. Exclusion Criteria: 1. Need to perform complicated endoscopic diagnosis and treatment techniques (such as cholangiopancreatography Surgery, endoscopic ultrasonography, endoscopic mucosal resection, endoscopic submucosa Stripping, oral endoscopic muscle dissection, etc.); 2. Patients who intend to undergo tracheal intubation; 3. It is judged to be difficult to manage the respiratory tract (modified Mallampati score is IV)patient; 4. Anemia or thrombocytopenia,( Hb\<90g/L, PLT\<80×109/L); 5. Diagnosed lung diseases (asthma, bronchitis, COPD, Pulmonary bullae,pulmonary embolism, pulmonary edema, lung cancer); 6. Liver and kidney disease;( AST and/or ALT≥2.5×ULN,TBIL≥1.5×ULN, blood creatinine is greater than the upper limit of normal); 7. There is a history of drug and/or alcohol abuse within 2 years before the beginning of the screening period.The average daily alcohol consumption exceeds 2 units of alcohol (1 unit = 360 mL beer Liquor or 45 mL liquor with 40% alcohol content or 150 mL grapes liqueur); 8. Hypertensive patients whose blood pressure has not been satisfactorily controlled by antihypertensive drugs(Sitting systolic blood pressure ≥160 mmHg during screening period, and/or diastolic pressure during screening period Pressure ≥100 mmHg); 9. Sitting systolic blood pressure ≤90 mmHg during the screening period; 10. Women who are pregnant or breastfeeding; 11. Benzodiazepines, opioids, propofol, lidoca Those who are allergic or contraindicated due to their drug components; 12. Participated in other drug clinical trials as subjects in the past 3 months; 13. The investigator believes that it is not appropriate to participate in this trial; 14. A well-diagnosed heart disease (heart failure, angina pectoris, myocardial infarction, heart rhythmabnormalities etc.).