NBI-NearFocus Assisted Cold Snare Polypectomy Improves the Complete Resection Rate of Small Colorectal Polyps: a Prospective Single-arm Observational Study

Inclusion Criteria: ① Outpatient or inpatient patients aged 18-85 years old; ② Untamed, subpodial, and flat polyps with a diameter of 5-9mm (Paris classification: O-Is O-Isp、O-IIa；JNET Classification: Typel, Type2A); ③ Patients who agree to participate in this study. Exclusion Criteria: * Individuals currently taking antiplatelet or anticoagulant drugs, or those with coagulation dysfunction (PT prolongation greater than 3 seconds); * Polyp diameter\<5mm or ≥ 10mm, morphology does not conform or JNET classification ≥ Type 2B; * Individuals with severe heart, lung, liver and kidney dysfunction or severe mental disorders who cannot cooperate with the examination; ④ Patients with intestinal obstruction, inflammatory bowel disease, Lynch syndrome, and familial adenomatous polyposis diagnosis; * Pregnancy; ⑥ Those who fail to meet the requirements for bowel cleansing preparation (BBPS\<6 points).