The present invention relates to a medical apparatus (100) for use in manufacturing a plaster impression of limb stump, in particular of a lower stump, wherein the apparatus (100) comprises a pressure vessel (1) with a fluid chamber of pressure chamber (DK) for receiving or storing a fluid (F) being under pressure, wherein the pressure vessel (1) is limited against an exterior (Ä), wherein the pressure vessel (1) comprises an insertion opening (9) for the insertion of a limb stump (KS) into the interior (I) of the pressure vessel (1) and a fluid-tight membrane (5) made of two materials, which are arranged to form or limit the fluid chamber or the pressure chamber (DK). In addition, the present invention relates to a system (300) having a medical apparatus (100) and at least one contact surface (111). Furthermore, the present invention relates to a method.
