Patent ID: 8945055
Filing Date: 2015-02-03
Classification: F04B

Abstract:
1. A pump unit, replaceably attachable to a reusable backend of an injection arrangement for delivering a liquid medicament, the pump unit comprising a medicament inlet, a medicament outlet and a peristaltic pump for delivering the liquid medicament from the inlet to the outlet, the peristaltic pump comprising a pump rotor and a pump hose, the pump hose partially arranged around the pump rotor, the pump rotor having protrusions for engaging the pump hose, characterized in that a fixing side of the pump unit facing a reusable backend when attached has a recess in the shape of a circular arc for allowing a correspondingly shaped stop protruding from the reusable backend to enter into the pump unit so as to support the pump hose from an outer side opposite the pump rotor thus allowing the protrusions to locally squeeze the pump hose against the stop when attached to the reusable backend.