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WPI MICRO-ePUMP Microinjector

WPI MICRO-ePUMP Microinjector

WPI MICRO-ePUMP Microinjector

Microinjection of diverse compounds and biomolecules - DNA, RNA, proteins

World Precision Instruments

Designed to simplify intracellular injection and a variety of other microinjection tasks, the MICRO-ePUMP uses cafeully regulated air pressure for injecting cells with fluid. Injected volumes range from picolitres to nanolitres. The port supplies positive pressure for high-pressure ejection. The pressure port maintains a low positive “compensation” pressure to the injecting pipette between injection pulses to prevent fluid uptake through capillary action.



  • Internal pressure source
  • Intuitive user-interface for injector and MICRO-ePORE
  • Small footprint takes up very little bench space
  • Easy to navigate with tough screen and control knob
  • Inject into a single cell in picolitre volumes

Timing, injection pressure and compensation pressure are adjusted independently using the touch screen interface. Time intervals can range from 2s down to 10ms or less, depending on the injection pressure setting. The injection pressure interval is triggered using the foot switch.


The MICRO-ePUMP is designed to inject very small quantities of fluids, such as drugs, into cells or small organelles. Pressure injection is an especially useful alternative to electroionophoresis, since it does not mandate the use of charged ions. The compensation pressure is a constant low pressure that eliminates any capillary action front-filling of the pipette and then the precise burst of regulated higher pressure is activated with the foot switch that is included.


WPI’s MICRO-ePORE™ Pinpoint Cell Penetrator technology is embedded inside the MICRO-ePUMP. When the researcher enables the MICRO-ePORE™, it delivers a highly localised voltage signal to a targeted injection site to facilitate penetration with minimal trauma. The researcher determines the amplitude and frequency of the signal that best suits the application. The signal originates in the control box, and it is transmitted through the electrode interface cable to the microelectrode holder. A silver wire is used to transmit the signal into the electrically conductive substance being injected. A reference electrode is used to place the media at 0.0 V potential with reference to the generated voltage.


The MICRO-ePUMP offers separate regulated compensation (back filling prevention) and injection pressures with a precision timing circuit that switches from injection pressure to compensation pressure automatically.


For further information please contact us or download the datasheet.


MICRO-ePUMP brochure                                                            Read more on WPI's website