Fluid injection device

A fluid injection method, comprising:

• supplying fluid with a fluid supply unit that supplies fluid;
• incising tissue with a fluid injection unit having a piezoelectric element by injecting fluid supplied from the fluid supply;
• and
• providing a driving waveform generating device, the driving waveform generating device including:
• at least one input device capable of accepting an input for changing a fluid injection condition of the fluid injection unit;
• a one-input multiple-control parameter changing unit capable of changing multiple control parameters for determining a fluid injection condition of the fluid injection unit according to the input accepted by the input device;
• a driving waveform generator capable of generating and outputting a driving waveform of the piezoelectric element according to the multiple control parameters from the one-input multiple-control parameter changing unit, wherein
• the driving waveform generating device includes a set of predetermined control parameter values determining a fluid injection condition of the fluid injection unit, and
• the driving waveform is constructed by a pulsating portion and a resting portion at which a voltage is constant.