PROBLEM TO BE SOLVED: To provide a fluid ejection device which is suitable for the regulation of ejection operation of a fluid according to the state of contact of an ejection object with an ejection head, a method for driving the fluid ejection device, and a surgical instrument.SOLUTION: A fluid ejection device 1 comprises a fluid chamber 501, of which the volume is changeable, a volume changing portion 405 that changes the volume of the fluid chamber 501, a connection passage tube 200 that conveys pulsation from the fluid chamber 501 to a fluid ejection opening 212 in a head nozzle 211, a fluid supply pump 20, a first electrode 50 in which the nozzle 211 is a first contact portion 50a, a second electrode 51 having a second contact portion 51a applicable as a patch to an ejection object, an energization determination portion 30b that determines the energization state of the first electrode 50 and the second electrode 51, and a drive portion 30 that drives the volume changing portion 405. Meanwhile, in an energized state, the drive portion 30 regulates the volume changing portion 405 to be actuatable. In a non-energized state, the drive portion 30 regulates the volume changing portion 405 to be non-actuatable.COPYRIGHT: (C)2013,JPO&INPIT【課題】噴射対象物と噴射先端との接触状態に応じて流体の噴射動作を制御するのに好適な流体噴射装置、流体噴射装置の駆動方法及び手術用器具を提供する。【解決手段】流体噴射装置1を、容積が変更可能な流体室501と、流体室501の容積を変更する容積変更部405と、流体室501からの脈動を先端のノズル211の流体噴射開口部212に伝達する接続流路管200と、流体を供給するポンプ20と、ノズル211を第1の接触部50aとした第1の電極50と、噴射対象物に貼付可能な第2の接触部51aを有する第2の電極51と、第1及び第2の電極50及び51の通電状態を判定する通電判定部30bと、容積変更部405を駆動する駆動部30とを含む構成とした。そして、駆動部30は、通電状態のときに、容積変更部405を動作可能に制御し、通電していない状態のときに、容積変更部405を動作しないように制御する。【選択図】図1
