the raised portions and the flow holes is reversed the raised portion is formed by a component comprising portions which are hollow with respect to the main surface and flow holes provided at least in the projecting portion the material tears so as to expose the projecting portions provided with the holes according to a fifth embodiment the raised portions are pyramidal members associated with complementary members which are not designed to tear the extraction surface of the cartridge but to facilitate the flow of the fluid extract while retaining the substance for instance in the form of terraces with a width of 0 2 to 1 mm surrounding the pyramidal shapes and channels at the base with a width of approximately 0 7 to 2 5 mm and a depth of approximately 0 3 to 1 8 mm these channels are drilled with a number of flow holes calibrated to a diameter of some tenths of a millimeter according to a first variant the pyramidal shapes are formed by truncated pyramids with sides measuring 1 to 7 mm and a height of 1 to 7 mm preferably disposed in a grid whose pitch is conventionally between 3 and 10 mm the surfaces preferably have an angle of 10 u00b0 to 30 u00b0 to vertical the upper.