Patent ID: 9561049
Date: 2017-02-07
CPC Classifications: A61B

Claim:
1. A fluid ejection device comprising: a fluid container that has a fluid accommodation portion for accommodating a fluid, and a fluid outlet formed in the fluid accommodation portion; a fluid pressing unit that moves in a pressing direction according to a movement command, and presses the fluid accommodation portion to cause the fluid to flow out of the fluid outlet; a connection tube, one end of which is connected to the fluid outlet; a fluid ejection unit that has a fluid intake port connected to the other end of the connection tube, and ejects in a pulsed manner the fluid taken in via the fluid intake port; a pressure detection unit that detects an inner pressure of the fluid accommodation portion; a channel opening and closing unit that opens and closes a channel of the fluid in the connection tube; a press control unit that outputs the movement command to the fluid pressing unit and controls the inner pressure of the fluid accommodation portion to approach a predetermined target pressure value, in a state where the channel is closed by the channel opening and closing unit; a movement speed acquisition unit that acquires a movement speed of the fluid pressing unit; and a channel determination unit configured to determine that the channel is not closed by the channel opening and closing unit, in a case where the movement speed of the fluid pressing unit is a predetermined speed or higher when a predetermined amount of time has elapsed after a difference between the inner pressure of the fluid accommodation portion and the target pressure value becomes less than a predetermined value.