A cannula for infusion of blood into a blood vessel includes a flexible membrane member which is secured to the leading end of a blood admitting pipe. An end insert is secured to the leading end of the flexible membrane member, and a core member is fixedly connected to the end insert. A fluid passage...http://www.google.ca/patents/US4655748?utm_source=gb-gplus-sharePatent US4655748 - Cannula for infusion of fluid
