Bei einem medizinischen Instrument mit einem Bergebeutel (2) zum Bergen von bei einer Operation, insbesondere endoskopischen Operation, aus einem zu operierenden Körper zu entfernenden Material (11), ist innerhalb des Bergebeutels (2) ein Netz (7) angeordnet, welches zum Zerkleinern des Materials (11) durch das Material (11) durchziehbar ist (Fig. 2).The instrument has an extraction bag (2) extracting material to be removed from a body to be operated during endoscope operation. A net (7) is arranged within the extraction bag, and is drawn through the material for breaking up the material. The net is drawn through by a tensile element and an actuating part (21). The actuating part is combined together with the tensile element. The net is placed within the extraction bag in an initial position, and is withdrawn partially from the extraction bag after drawing through.