User manual

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the entire pump for new utilization, but the entire set is again replaced. In case of using the

above mentioned pumps, the medium flows directly through the pump’s body in such a way

that it gets in contact with this pump’s mechanical elements. It is possible to sterilize these

surfaces (chemically, thermally, etc.), yet the act itself is rather complicated and requires the

removal of the actual drawing head, etc. Certain disadvantage of the peristaltic pumps lies in

the fact that flexible tubing is used as a drawing element, and this tubing is compressed in

regular intervals. That may lead to impairing this part of the tubing, or to even a partial

rupture thereof, which then results in contamination, or eventually its full avulsion means the

drawing does not continue. Commercially used infusion pumps basically use two types of

peristaltic drive. It is a rotation system with two and more stoppers, or a system with a linear

wave.

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Rotationsystems

Rotation systems consists of a rotor with rollers, so called stoppers, which compress

the flexible tubing, and the rotor’s rotation causes the advancement of the liquid inside the

tubing. There are several versions and arrangements. One of the aspects of the rotation

peristaltic pumps is in the mounting system of the tubing. There are two versions, either with

a supporting trail or without it. The version without the supporting trail is the simplest

constructionally speaking, yet it is only suitable for certain types of tubing, it requires special

mounting, and is rather used for other applications (dispensing chemicals, in clinical

analyzers, etc.). This version is depicted in Fig. 5.1.

Fig. 5.1: Rotation peristaltic heads, without the supporting trail.

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However, the so called pumps with supporting trail are much more common in the

area of linear infusion pumps, with the tubing not being taut over the individual stoppers, but

rather being pressed to them. These are the systems with the so called supporting trail. These