Patent ID: 8198072

Claim:
A vibration type microinjection device comprising: a vibrator which is connected in series between a micropipette and an injection controller part, the vibrator comprising: a housing having an open path extending longitudinally through the center of the housing, the housing being made of elastically deformable material; and a cylindrical piezoelectric actuator installed in the housing around the open path to apply vibration to the housing; a signal control device for controlling an electric signal applied to the piezoelectric actuator, wherein vibration is applied in the longitudinal direction of the micropipette via the vibrator by inputting an electric signal to the piezoelectric actuator, and wherein the signal control device comprises a variable frequency oscillator, an amplifier for amplitude adjustment connected to the variable frequency oscillator, a switch connected to the amplifier for amplitude adjustment, an adder to which the switch and a variable DC source for offset adjustment are connected, and a power amplifier which is connected to the adder and which supplies an electric signal to the piezoelectric actuator.