Design, Manufacturing and Mechanical Evaluation of a 3D Printed Customized Wrist-Hand Orthosis for the Treatment of De Quervain Tenosynovitis †

De Quervain’s tenosynovitis is a pathology that affects the tendons of the thumb and generates pain and inflammation, being common in people between 18 and 30 years old who perform repetitive movements. Despite the innovation of 3D printing in orthotics, customization is lacking. Therefore, this works aims to develop a 3D printed customized wrist-hand orthosis (WHO) for the treatment of De Quervain tenosynovitis. The WHO includes three main parts, which would be two faces that cover the front and back of the hand and the locks to ensure the coupling of both faces. Prior to 3D printing, feedstock filament characterization tests were carried out, and tensile strength, melt flow index, degradation, and melting temperature were obtained. 3D printing of the WHO was achieved in a short time and with an adequate fit. Subsequently, mechanical tests were carried out to evaluate the maximum force of the WHO in different positions.