CONTINUOUS/BOLUS INJECTION DEVICE

PROBLEM TO BE SOLVED: To provide a device and a system for both of the constant feeding of a useful drug and a controlled replenishment of the useful drug to a patient, which are inexpensive, extremely movable, and easy to use. SOLUTION: This device for the dispensation of a liquid is constituted of a bolus dosing means and a thin tube means for flowing-down. In this case, the bolus dosing means is under a fluid-communicating state with a liquid source-providing means under a pressurized state, a means to regulate a constant flow rate of a liquid which is under a fluid-communicating state with a liquid source, and also, the liquid source to provide a controllable bolus dosing with the liquid. In the meantime, the thin tube means for flowing-down is under a fluid-communicating state with the above regulating means and the bolus dosing means.