On the market there is a relatively large number of different constructions of intramedullary nails. Although a lot of resources are being invested in the development of an ideal construction, the required optimization between the technology and the costs versus functionality and operational simplicity has not yet been achieved. In the first part of this paper we’ve compared the intramedullary nails with other internal fixators. It has been concluded that nails are ideal for long and strong bones, and have great advantages over their operational simplicity and the way they are loaded. Different groups of intramedullary nails were then described and compared, and many clinical studies compared their clinical and functional characteristics. Based on this data, critical conditions were defined: structural integrity, cut-out in femoral head, skin and distal end. Successful applications have also been found: reducing the duration of surgery and loss of blood, preventing the femoral head rotation around the lag screw, and securing the cranial bone into the structure. According to the critical conditions and features of successful application, the deficiencies of certain types of constructions were presented and the general direction of the optimization of the structure was defined - maintaining the technology and the price of the products while optimizing functionality and operational simplicity. Two concepts were created in accordance with these requirements, which are described in detail. Concepts were compared through the potential method with the reference concept - Troch nail from Instrumentaria d.d.. With iterative procedure the best performing functions of particular concepts have been incorporated into the final concept that has been elaborated in detail. The final design brings benefits in preventing cut-out effect thanks to the shielding of the shape between the lag screw and the locking plate, which further supports the conical shape of the tip of the lag screw for femoral head. Furthermore, operationally it is positioned and disposed easier as it contains fewer parts for the insertion and the orientation of the plate is secured by the positions of the slots in the nail rod. The possibility of simple production technology by bending and separating particles has been retained so that there would be no price increase of the product, and rubber parts that need to be tightened at high temperatures were avoided. Finally, the product still needs to be tested by using FEA tools, which is a demanding process in respect to the complex dynamics of human motion and it exceeds the scope of this paper.