Safety-and-effectiveness Clinical Evaluation of Nanosecond-pulse Ablation for Atrial Fibrillation

Inclusion Criteria: Subjects must meet all of the following conditions to be enrolled: 1. 18 to 80 years of age, gender is not limited 2. Patients with a clinical diagnosis of paroxysmal atrial fibrillation confirmed by ECG 3. Patients who were to undergo catheter ablation of atrial fibrillation 4. Those who agreed to participate in this study and voluntarily signed the informed consent form Exclusion Criteria: Subjects were excluded if they met one of the following conditions: 1. Patients who have had ablation for atrial fibrillation 2. Patients with left ventricular ejection fraction (LVEF) \<35%. 3. Patients with an anteroposterior diameter of the left atrium (echocardiography) \>50 mm 4. Preoperative detection of a definite thrombus in the left atrium 5. Patients with cardiac function class (NYHA) III-IV 6. Patients with second-degree (type II) or third-degree atrioventricular block 7. Patients with significant congenital heart defects (including atrial septal defect, ventricular septal defect, arterial ductus arteriosus, transposition ofthe grea, or severe pulmonicvalve, but not including foramen ovale persistens) 8. Patients with implanted prosthetic valves or the presence of severe heart valve disease, who are not suitable for ablation for atrial fibrillation 9. Patients with artificial cardiac pacemaker or implantable cardioverter defibrillator (ICDs) 10. Patients diagnosed with hypertrophic obstructive cardiomyopathy, chronic obstructive pulmonary disease, or myxoma 11. Patients who need to undergo left atrial appendage closure in the same surgery 12. Patients found to have atrial flutter preoperatively and judged unsuitable by the investigators, or patients with atrial parasystolic tachycardia (non-pulmonary venous origin) or paroxysmal supraventricular tachycardia 13. Patients with active systemic infection who are judged unsuitable for interventional therapy by the investigators 14. Patients with systemic bleeding tendencies that preclude surgery or patients with renal failure undergoing hemodialysis 15. Patients who have had a myocardial infarction or any interventional/open heart surgery (except coronary angiography) within 3 months 16. Patients who have had a stroke (except asymptomatic stroke) or transient ischemic attack within 3 months 17. Patients with significant contraindications to interventional procedures or with an expected survival of \<1 year who are judged by the investigator to be incapable of undergoing ablative procedures 18. Females who are pregnant or breastfeeding or who are planning to have children during the study period 19. Patients who have participated in a clinical trial of another drug or medical device within 3 months 20. Patients who, in the opinion of the investigator, are not suitable for participation in this clinical trial