Fixing Sleeve for Firmly Fixing a Plug to a Socket, and Injector Assembly

A fixing sleeve firmly fixes a plug to a socket. The fixing sleeve has two half-shells, which delimit a receiving space for receiving at least one part of the plug. A fastener is arranged adjacently to a plug-side end face of the fixing sleeve. An injector assembly includes an injector with a socket, a cable fastened to the plug, and the fixing sleeve.