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We use a World Precision Instruments Ultramicropump II (UMP-II) injector outfitted with micro syringes to deliver picoliter volumes of biochemical agents. With its digital controller, UMP-II can dispense as little as 26 picoliters per incremental advance of the syringe piston (using a 0.5 µl syringe). Syringes may be filled externally and then inserted into the pump or filled while mounted in the pump. Fluids injected or withdrawn are held entirely within the needle. The plunger extends to the tip of the needle, displacing the full sample during injection. This gives these syringes zero dead volume. Micro syringes are easily installed - just snap the barrel into the clamps. UMP-II accepts a range of syringes from 0.5 µl to 1 ml. For positioning, our UMP-II is attached to a WPI M3301 micropositioner, allowing excellent mechanical resolution and positional control of the delivery pipette tip. An integral component in the UMP-II system is a microprocessor-based controller which provides an "intelligent" and easy-to-use interface to the syringe pump: the WPI Micro4. Operating parameters are set with the membrane keypad and LCD display. From the keypad the user can select the following functions: set pump to infusion or withdrawal mode, enter the volume to be infused or withdrawn, rate of delivery, and syringe type as well as starting and stopping the pump. With the four-channel unit, Micro4, you can synchronize the starting and stopping of any combination of syringe pumps.
Please click on the images to obtain further details about this equipment.
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