A membrane applied to the ostium of an atrial appendage is disclosed. The membrane prevents blood clots in the atrial appendage from escaping therefrom and entering the blood stream which can result in a blocked blood vessel, leading to strokes and heart attacks. The membrane may be permeable or impermeable...http://www.google.ca/patents/US6652555?utm_source=gb-gplus-sharePatent US6652555 - Barrier device for covering the ostium of left atrial appendage
