Disclosed is a method of using a connector for introducing medication into a patient in a safe, convenient way. It comprises a pair of plastic tubular members adapted to be manually pushed together to engage in a male-female relationship, and a locking mechanism that detachably secures the members together....http://www.google.de/patents/US5199947?utm_source=gb-gplus-sharePatent US5199947 - Method of locking an influent line to a piggyback connector
