Barrier device for covering the ostium of left atrial appendage

The invention claims a is used for atrium accessory opening film. The film preventing the atrium accessory the blood clot to overflow and inward from the atrium accessory the blood flow, the anti-overflow of blood clot and with a blood flow so the vessel blocking; with the stroke and heart disease. The film is penetrable or impenetrable to the blood flow. The film arranged on the left atrium accessory the opening is extended. The circumference's film diameter is greater than the opening the size corresponding. Further claims a fixing device, a of the film the inner surface with around the atrium fitting wall of the opening. The fixing device is arranged between the vibration and atrium wall, or the fixing device capable and passes through the opening is extended to the base distant from the film.