INFUSION BAG

The invention relates to a medical package designed as an infusion bag, which medical package is made from multi-layer films that are welded to one another and is filled with a medical liquid for infusion and/or for parenteral nutrition. The invention is described by a medical package designed as an infusion bag, which is made up of a film comprising multiple layers welded to one another and has at least one weld seam, preferably longitudinal and transverse weld seams, and is filled with a medical liquid. The multi-layer film has at least one inner layer of a matrix-phase polymer system, an intermediate layer of a matrix-phase polymer system, and an outer layer of a matrix-phase polymer system. The matrix polymer of the matrix-phase polymer system of the inner layer, the intermediate layer and the outer layer in each case comprises a polypropylene polymer (PP) having defined parts by weight in the individual layers, and the phase polymer of the matrix-phase polymer system of the inner layer, the intermediate layer and the outer layer in each case comprises a styrene-ethylene/butyl-styrene block copolymer (SEBS) having defined parts by weight in the individual layers. The film is characterised in that the styrene-ethylene/butyl-styrene block copolymer (SEBS) of the intermediate layer has a styrene-ethylene/butylene ratio (S/EBM) and the styrene-ethylene/butylene-styrene block copolymer (SEBS) of the outer layer has a styrene-ethylene/butylene ratio (S/EBA), in which S/EBA > S/EBM. It has been shown that in this way the mechanical properties of the multi-layer film can be improved, in particular in the event of expansion of the multi-layer film in the region of the weld seams. The improved mechanical properties appear both at room temperature and also at lower temperatures of down to 4 °C. L'invention concerne un conditionnement médical servant de sachet de perfusion, qui est constitué de feuilles multicouches soudées ensemble et qui est rempli d'un liquide médical pour la perfusion et/ou pour la nutrition parentérale. L'invention est décrite par un conditionnement médical servant de sachet de perfusion, qui est réalisé à partir d'une feuille multicouche soudée ensemble et qui possède au moins un fil de soudure, de préférence des fils de soudure longitudinale et transversale, et qui est rempli d'un liquide médical, la feuille multicouche possédant au moins une couche intérieure constituée d'un système polymère phase-matrice, une couche centrale constituée d'