Liquid ejection device and medical instrument including liquid ejection device

A medical instrument comprising:

• an injection nozzle through which fluid is ejected;
• a fluid chamber connected with the injection nozzle, wherein the fluid to be ejected is supplied to the fluid chamber;
• a fluid pressurizing and supplying unit which pressurizes the fluid and supplies the pressurized fluid to the fluid chamber;
• a volume varying unit which deforms in response to a driving voltage applied to the volume varying unit to vary a volume of the fluid chamber;
• a driving voltage applying unit which applies the driving voltage having a predetermined voltage waveform to the volume varying unit with fluid supplied to the fluid chamber;
• a controller that compensates the driving voltage for pressure fluctuations in the pressurized fluid by applying correction coefficients to one or more of the waveforms of the driving voltage and adjusting an between waveforms of the driving voltage, wherein the correction coefficients are determined using pressure fluctuation data stored in a memory unit associated with the medical instrument.

A medical instrument device comprising:

• an injection nozzle through which fluid is ejected;
• a fluid chamber connected with the injection nozzle, wherein the fluid to be ejected is supplied to the fluid chamber;
• a fluid pressurizing and supplying unit which pressurizes the fluid and supplies the pressurized fluid to the fluid chamber;
• a volume varying unit which deforms in response to a driving voltage applied to the volume varying unit to vary a volume of the fluid chamber;
• a driving voltage applying unit which applies the driving voltage having a predetermined voltage waveform to the volume varying unit with fluid supplied to the fluid chamber;
• a memory unit which stores pressure fluctuation data associated with fluid pressurized and supplied to the fluid chamber;
• wherein
• the fluid pressurizing and supplying unit is a unit which pressurizes and supplies fluid to the fluid chamber with pressure fluctuations generated during supply of the pressurized fluid,
• the driving voltage applying unit applies the driving voltage to the volume varying unit, wherein the driving voltage applying unit compensates the driving voltage by changing the voltage waveform based on the pressure fluctuation.