| 摘要 |
The fluid dispensing device (10) is utilized in a fluid dispensing system (12) which includes a syringe (22) having a cylindrical barrel (36) with an inlet/outlet opening (20) at a forward end thereof and which is open at the rearward end thereof. A plunger (38) is received in the barrel (36). A source (14) of medicinal additive is coupled by a two-way check valve (18) to the inlet/outlet opening (20). A needle (24) is mounted to the outlet (26) of the valve (18). The fluid dispensing device (10) is manipulatable to operate the syringe (22), first to draw a precise amount of medicinal additive into the syringe (22) through the valve (18) and second to dispense the precise amount of medicinal additive from the syringe (22) through the needle (24) into, for example, a receptacle (34) having a base liquid therein. The device (10) comprises a body (50), holder (52, 54, 56) on body (50) for receiving and holding the syringe (22), actuator (84) on the body (50) for engaging the plunger (38) and powered piston assembly (88, 90, 92, 98 and 100) for selectively moving the actuator (84) between a forward position where the syringe (22) is ready to draw in a medicinal additive and a rearward portion defining the precise amount of medicinal additive to be drawn into the syringe (22).
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