A Single Center Study on Comparing the Different Function of EndoAngel in Improving the Quality of Colonscopy

Inclusion Criteria:

1. Male or female aged 18 years or above;
2. Colonoscopy is needed to further characterize gastrointestinal diseases;
3. Ability to read, understand and sign informed consent forms;
4. The researchers believe that the subjects can understand the process of the clinical study and are willing and able to complete all the study procedures and follow-up visits to cooperate with the study procedures.

Exclusion Criteria:

1. Participated in other clinical trials, signed informed consent forms and followed up in other clinical trials；
2. Participate in a drug clinical trial and during the elution period of the trial or control drug；
3. Drug or alcohol abuse or mental disorder in the last 5 years;
4. Pregnant or lactating women;
5. Patients with multiple polyp syndrome;
6. Patients with a history of inflammatory bowel disease, colorectal cancer, or colorectal surgery;
7. Patients with known perforation or colonic obstruction;
8. Patients with a contraindication for biopsy;
9. The researchers did not consider the subjects suitable for colonoscopy;
10. The researchers determined that the subjects had high-risk diseases or other special conditions that were not appropriate for clinical trials.