Arcoma is a company that develops and manufactures X-ray equipment for hospitals. One of the most crucial components is the digital detector. Due to the high cost it is made removable so it could be transferred and used in other X-ray apparatus. The detector is placed in a so called detector holder. The current detector has a rectangular shape which sometimes requires a 90 degree rotation to match the shape of the patient. Recently a new quadratic detector has been introduced on the market which is larger than the current one. Because of the quadratic shape and size the new detector will not need the rotation. This means that the input function as well as the holder has to be redesigned to adapt. In this thesis the development of the detector holder is described. In the planning phase a product specification was developed. The main requirement was that the solution had to be purely mechanical. A guideline was that the new construction also had to be cheaper to manufacture than the current one. The methodology can be broadly divided into initial studies, concept generation, concept development and a final assemble in a CAD computer software. Three different main concepts where produced. They were evaluated using a Pugh matrix. One was then developed which resulted in a cheaper and much narrower construction than the original solution. This report was made for Arcoma to be used as a basis for their future development of the detector holder.