Orthopositioning device for three-dimensional scanning of a seated person: inclusive design for wheelchair users

Three-dimensional (3D) scanning has become an essential tool across multiple disciplines; however, accessibility remains limited for individuals unable to stand. Capturing human morphology in different postures is crucial for accurate anthropometric analysis and product development. This study aimed to develop an inclusive solution that enables the three-dimensional digitisation of seated individuals, including those with physical disabilities and wheelchair users.

The research followed the Design Science Research (DSR) methodology combined with Löbach's product design model and an inclusive design framework. The orthopositioning device was developed through iterative modelling, mock-ups and both physical and digital simulations. The final prototype was evaluated with seven participants, including one wheelchair user. Data were acquired using a low-cost Kinect 360 infra-red scanner, and the resulting meshes were analysed visually and morphologically to assess completeness and accuracy.

The study led to the creation of an orthopositioning device that enables 3D scanning in multiple postures, seated, prone, or supinem, with arms and legs either flexed or extended. The transparent acrylic structure prevents occlusions and ensures full-body visibility, overcoming limitations of conventional seating systems. Functional validation confirmed comprehensive coverage (over 90% of the body surface) and high morphological fidelity.

The inclusive design of the proposed device broadens access to digital anthropometry and product design research by enabling accurate 3D digitisation of diverse user populations, especially individuals with mobility impairments.