Device, system and method for movement tracking

A system for detecting relative movement of body parts, the system having at least a first subsystem and a second subsystem, wherein the first subsystem is designed to be fastened to a first body part, the first body part being an upper jaw, or a body region rigidly connected to the upper jaw, and the second subsystem is designed to be fastened to a second body part, the second body part being a lower jaw, wherein the first body part and the second body part are movable relative to each other, and wherein the system comprises a movement sensor system and a calibration sensor system, wherein

• the movement sensor system is designed to detect the relative movement or a relative position of the first body part and the second body part across a movement region, by generating data from which a movement trajectory or course of the relative movement of the first body part and of the second body part can be obtained or is obtained, and
• the calibration sensor system is designed to determine the relative position of the first body part relative to the second body part if the first body part and the second body part are arranged relative to each other in a calibration region,
• wherein the system is designed to compare a current relative position, obtained by means of the calibration sensor system, with a relative position obtained at a same time by means of the movement sensor system, in order to carry out a calibration alignment, and
• wherein if the calibration alignment shows that the compared relative positions are different, the system is designed to transfer the current relative position, determined by means of the calibration sensor system, to the movement sensor system, such that the movement sensor system can use the current relative position as a starting point for a further movement detection.