Cartridge system

A cartridge system, comprising a tubular bag containing a viscous material, a cylindrical sleeve with a sleeve wall which completely surrounds the tubular bag, the sleeve having a delivery-side end and a distal end opposite the delivery-side end, a closure element which is disposed at the distal end of the sleeve and is releasably connected to the sleeve, and a shoulder element which is disposed at the delivery-side end of the sleeve and is releasably connected to the sleeve, the shoulder element comprising a central through-flow channel and an outlet opening for delivering the viscous material out of the cartridge system and having at least one piercing point for piercing the tubular bag, wherein the shoulder element has a compression ring which protrudes concentric to the sleeve wall into an interior of the sleeve delimited by the sleeve wall and the outer diameter of which compression ring is reduced compared to the inner diameter of the sleeve such that an annular gap is formed between the sleeve wall and the compression ring, a compression chamber being formed inside the compression ring, into which compression chamber the at least one piercing point protrudes, with the compression ring protruding further into the interior of the sleeve than the at least one piercing point.