A device and method for polymer modification of biological cells includes pumping a first liquid mixture comprising biological cells from a first reservoir to a mixing chamber and a second liquid mixture comprising activated polymer from a second reservoir to the same mixing chamber, independently controlling an output volume of the first and second liquid mixtures pumped into the mixing chamber using at least one pump, mixing the first and second liquid mixtures in the mixing chamber to produce a final mixture comprising polymer-modified biological cells, and evacuating the final mixture comprising polymer-modified biological cells from the mixing chamber into an output reservoir.
