Abstract: An assembly and a system suitable for dispensing liquid from a compressible bag, such as for IV treatment of a patient. The assembly includes an apparatus and a flexible mat. The apparatus includes a housing with a dispensing end and an opposite rear end, a floor comprising a flat floor surface, a pair of parallel guiding tracks and a roller arrangement including a roller body. The roller arrangement has a first roller arrangement end and a second roller arrangement end respectively engaged with the respective guiding tracks. The mat has a first mat end, which is mounted to or adapted to be mounted to the roller body and the mat is located at least partly on the flat floor between the guiding tracks.

Abstract: A bag pump for dispensing a liquid from a compressible bag to a patient is disclosed. In an embodiment the bag pump includes a box having a rear wall, an opposite front wall, two side walls and a floor between the walls. The bag box includes a propulsion spring mechanism attached at a first end thereof to one of the walls. The bag pump further includes a roller fixed to a second end of the propulsion spring mechanism The roller is adapted to squeeze the compressible bag between the roller and the floor by action of the propulsion spring mechanism.