The Amplatzer Muscular VSD Occluder is a transcatheter device designed for the closure of complex muscular ventricular septal defects (VSDs) in patients who are at high risk for standard surgical repair. The self-expanding device is made from nitinol wire mesh and polyester material, which promotes tissue in-growth for a permanent seal. Its symmetrical double-disc design with a connecting waist allows for precise placement and stable occlusion of the defect. The device can be recaptured and redeployed during the procedure to ensure optimal positioning, offering a minimally invasive alternative to open-heart surgery.