Patent ID: 7147132

Claim:
An ampoule for containing a specified amount of liquid inside, said ampoule comprising: a tubular main body having a first open part at one end and a second open part at an opposite end, said first open part including an outlet; a first piston inserted into said main body from said first open part in an airtight manner, said first piston being slidable in an axial direction of said main body; a second piston inserted into said main body from said second open part in an airtight manner, said second piston being slidable in said axial direction of said main body, said first piston and said second piston forming therebetween a reservoir for storing said liquid therein, said first piston having a weakened part on a side that faces said reservoir; and a sharp member penetrating said weakened part and to thereby connect said reservoir with said outlet; wherein said main body has a guide groove at said outlet, said guide groove extending forward and being upwardly open.