Apparatus for permanent placement across an ostium of a left atrial appendage in a patient, which includes a filtering membrane configured to extend across the ostium of the left atrial appendage. The filtering membrane has a permeable structure which allows blood to flow through but substantially inhibits...http://www.google.com/patents/US7727189?utm_source=gb-gplus-sharePatent US7727189 - Filter apparatus for ostium of left atrial appendage
