A one-way valve suitable for implant in the human vascular system is disclosed. The valve is formed by a tube of braided filaments and has an upstream end supported in an open configuration by a radial support. The valve has a downstream portion formed by a plurality of flexible leaflets resiliently...http://www.google.de/patents/US6494909?utm_source=gb-gplus-sharePatent US6494909 - Endovascular valve
