1. A prosthetic device, including an external shaft (10), which has a proximal hole (11) and at its distal end (12) connecting means (13) for attaching an additional component and is made of a material that is rigid in the longitudinal extent, in which at least one groove (14) extending at least partially in the longitudinal extent is made to allow radial deformation, an inner rod (20), which is made of flexible material and has a proximal hole (21), at least one clamping device (30), which is fixed on the outer shaft (10) and which can be accessed by changing the diameter of the outer shaft (10), characterized in that on the side of the outer shaft (10) facing the inner shaft (20) at least one electrode (40) is fixed so as to be biased. 2. A prosthetic device according to claim 1, characterized in that at least one region (22) is provided on the inner shaft (20), provided with conductive elements (23) that conduct muscle electrical signals from the inner side (24) of the inner shaft (20) to the outside (25) of the inner shaft (20). 3. A prosthetic device according to claim 2, characterized in that the conductive elements (23) are embedded in the inner shaft or said region (22) is made in the form of a conductive polymer material. The prosthetic device according to one of paragraphs. 1-3, characterized in that the inner rod (20) is fixed to the outer rod (10) .5. A prosthetic device according to claim 1, characterized in that the inner shaft (20) has a closed cross section. The prosthetic device according to claim 1, distinguished1. Протезное устройство, включающее в себя- наружный стержень (10), который имеет проксимальное отверстие (11) и на своем дистальном конце (12) соединительные средства (13) для крепления дополнительного компонента и выполнен из жесткого в продольной протяженности материала, в котором выполнен по меньшей мере один проходящий по меньшей мере частично в продольной протяженности паз (14) для обеспечения возможности деформации в радиальном напра
