During micro injection into cells

the usual manipulation is that a holding needle finds and holds the cells into which will be injected

in the nutrient medium.But there are some shortcomings in this method

just as confusion about whether injection is made or not

poor injection efficiency and othersThis paper presents cell pointing feeding by a digital valveless micro-pump

which can improve the success rate of the micro injectionThis micro-pump draws the nurture fluid enwrapping cells into the inlet by capillary force

then ejects them based on the digital micro fluidic technologyThere exists a pressure gap between inlet and outlet

and the inlet forms the lock.Thus

cells in this micro-pump flows in one direction The pumped cells would be injected into one by one efficiently.