Lifetech KONAR MFO Post-Market Clinical Follow-Up Study

Inclusion Criteria: 1. Patients have a clinically relevant ventricular septum defect (VSD) by Echocardiography and/or X-ray examination according to current clinical standards and center-specific protocols. 2. The patient should be older than 6 months of age and a bodyweight heavier than 8kg. 3. Defect diameter (by 2D Echocardiography): The size of the VSD is larger than or equal to 2mm and less than 10mm. 4. Upper margin of VSD to aortic valve distance \>2 mm for models 6-4, 8-6, 10-8, 12-10, 14-12 and \>2.5mm for models 5-3, 7-5, 9-7, in case of PmVSD. 5. Only left to right shunt of the ventricular shunt. Exclusion Criteria: 1. Any contraindication mentioned in the corresponding IFU\*. * Note: In IFU, contraindications for The KONAR-MFTM VSD Occluder are as follows: 1. Patient has extensive congenital cardinal anomaly which can only be adequately repaired by cardiac surgery. 2. Presence of thrombus at the intended site of implant, or documented evidence of venous thrombus in the vessels through which access to the defect is gained. 3. Active endocarditis or other infections-producing bacteria. 4. The implant of KONAR-MFTM VSD Occluder would cause an obvious interference with the aortic valve or the atrioventricular valve. 5. Patients with severely increased pulmonary vascular resistance and a right-to-left shunt and patients with documented irreversible pulmonary vascular disease. 6. Patients with contraindications to anti-platelet therapy or agents. 2. The patient does present with an aortic valve prolapsing into the VSD. 3. Currently participating in other investigational drugs- or device studies. 4. The patient who is pregnant, planning to become pregnant, or breastfeeding. 5. Patients don't give informed written consent for the procedure. 6. Patient with other cardiac anomalies by surgery therapy.