| 摘要 |
PROBLEM TO BE SOLVED: To provide a small and simple-structured injection device preferable as an injection device of insulin in an artificial pancreas, by providing a hydraulic fluid guiding passage for guiding hydraulic fluid in a hydraulic fluid accumulating container into a pump chamber with prohibiting reverse flow and a volume change applying means for changing the volume of a hydraulic fluid storing chamber. SOLUTION: When alternating current is applied to an oscillator-type volume change applying device used for a volume change applying means E, the surface facing to a hydraulic fluid storing chamber A1 vibrates to repeatingly pressurize and depressurize the hydraulic fluid storing chamber A1. When it is depressurized, a delivery-fluid storing chamber A2 is also depressurized via an isolation member B. However, a delivery flow passage A3 is formed with prohibiting reverse flow and thus closed, and hydraulic fluid in a hydraulic fluid accumulating container C is guided into the hydraulic fluid storing chamber A1 through a hydraulic fluid guiding passage D. When it is pressurized, the hydraulic fluid guiding passage D is closed since the reverse flow is prohibited. Thus, as shown by two-dot chain line, this microinjection device elastically deforms a deflective barrier rib B1 in the delivery-fluid storing chamber A2 direction to deliver the delivery fluid in the delivery-fluid storing chamber A2. |
