Peristaltic pumps by INTEGRA move reagents through a tubing by mechanically deforming them such as the pressure rollers in the pump transport sensitive samples, for example blood cells, in a particularly protective manner, the liquid is transported within a completely closed tube system, the liquid therefore does not come into contact with the pump itself and the tubing can be cleaned and sterilized after use with these instruments it is also easy to create individual programs, e.g. dispensing with continually increasing.