A deadlock prevention mode indicator is provided, wherein the deadlock prevention mode indicator is a lock that can be held in a shared mode or in an exclusive mode by one or more of a plurality of threads, and wherein the plurality of threads can cause deadlocks while acquiring a plurality of data locks. An outer polygon is provided on the bottle adapter and an inner polygon designed correspondingly thereto is provided on the filler neck as anesthetic-specific codings. The lure is simply assembled by inserting the angling hook 36 into a U-shaped channel 18 which is provided in each of the head 14, main body 12 and tail 16, either closely adjacent to each other or with spaces therebetween.