This invention provides medical devices commonly accessed by syringes, said devices being characterized by comprising a cleanable, leakless built-in friction-fitting inlet-outlet port, said port being in the shape of the frustum of a cone, said frustum having a base and a top, said base being broader...http://www.google.de/patents/US5480393?utm_source=gb-gplus-sharePatent US5480393 - Needle free access adapter
