his research group was approached by Johnson & Johnson Company, who solicited proposals for a gentle pump which can be used in their electrophoresis blood treatment machine. There was a need for a blood pump, which could operate for a longer period of time without causing blood cell damage (hemolysis) to the treated patient. A number of concepts have been proposed by his group including screw type pumps, centrifugal pumps and roller pumps. Some of these concepts have also been tested. This idea was not proposed earlier.