A small glass vial that is sealed after filling and used chiefly as a container for a hypodermic injection solution. Ampules are commonly made of glass, although plastic ampules do exist.
Most commonly used ampule is no doubt Distal Water Ampule.
Parts of Ampule
How to Open Ampule
Ampules are opened by snapping off the glass top at the neck where a score line/point was pre-made during process of ampoule production. But the score line at neck does not alway break where it is intended, due to re-melting of glass to some unstable degree at that position.
Potential Hazard: Caution
From the day when ampule was invented, hand injuries from ampule opening are coming as a problem globally. It has lead to fatal result of disease cross infection through blood borne pathogens going through percutaneous lacerations. Such injuries could easily end to or lead to Hep. B, Hep C, HIV.
How to Break Ampule safely
Use an ampule cutter and gauze to prevent injury.
There are several kind of ampule breakers.