A catheter head for medical and therapeutic applications including a catheter head housing, a cannula which protrudes from the catheter head and is to be introduced into organic tissue, a container connection for connecting a container containing a fluid to be administered, a fluid channel through which the fluid flows during the administration thereof, an injection needle connection for connecting an injection needle, a connection chamber which is adjacent to the cannula, the injection needle connection, and the fluid channel, and a connector that is arranged in a first position such that the injection needle can be guided from the injection needle connection into the connection chamber and then into the cannula, and in a second position such that it closes the connection chamber from the injection needle connection in a sealing manner after the injection needle has been removed.