(57) Abstract Constitution The hollow container 1 which on the one hand provides opening 11 on side and,The expansion contractile unrestricted balloon 5 which is installed in hollow container 1With, the edge to close airtight opening 11 on the one hand, in the other edge the delivery port of the liquid medicine21 was provided the liquid medicine which is provided in the cover 2 which is provided and opening 11The filler inlet 22 which can produce the needle clamp in order to supply and the delivery portThe valve making 3 which can open and close 21 and valve move 3, the sendingIt had with the piezo-electric device 4 which it tries to open and close the exit 21It is. Advantages To open and close the valve with the piezo-electric deviceBecause it tries to adjust, quite structure being simple, spiritDense transmission can offer the possible small-sized trace liquid medicine injector.
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