METHOD FOR MEASURING TORTICOLLIS VALUE IN PATIENTS WITH STRABISMUS Russian patent published in 2024 - IPC A61F9/00 

FIELD: medicine; ophthalmology.

SUBSTANCE: head inertial navigation system is used, which includes a MEMS accelerometer, a MEMS gyroscope and a MEMS magnetometer, a wireless and wire data transmission module, a battery, inertial measurement unit MPU-9250, microcontroller ESP-32 and charge controller located in the housing, anaglyph glasses, neck, chin and shoulders fixator made of light metal alloy. Performing initial calibration of inertial navigation system to determine initial values of sensors, data are transmitted to microcontroller by means of inertial measuring module, which processes them and transmits data to computer. On the computer monitor, the patient is presented with a projection of the tangential grid located at the level of the patient's eyes, circles corresponding to marks 5, 10, 15 and 20° are marked on the grid according to the Bradis table, meridians from 0 to 360° are plotted radially along a circular scale, and a red point is located in the center of the grid. Patient fixes the point located in the center of the screen with a gaze; in the presence of diplopia, he sees two points; then the patient slowly turns his head in the direction indicated by the doctor in nine diagnostic positions until the position of the head is found in which there is no diplopia, that is, he sees one point. Doctor fixes, above the mark of which the most protruding point of the patient's chin is located at the moment of stopping the movement of the head, the farther from the shoulder edge the patient’s head stopped, the lower the degree of manifestation of torticollis. Using the device, the head position in three planes is recorded, at which there is no diplopia, and the torticollis value is determined in degrees for each head position; information is transmitted to a database of a computer program; determining the position of the head at which the patient sees one point is a criterion for assessing the dynamics of the patient's treatment. Investigation in each subsequent position is carried out after coordinates of the previous point are entered into the database of the program. In each position, changes in the position of the inertial navigation system are recorded. To determine the value of torticollis, head position changes are calculated using an inertial navigation system based on a turn quaternion transformation, as well as taking into account readings of the accelerometer, magnetometer and gyroscope, and the obtained shifts are added to the previous position.

EFFECT: use of invention will make it possible to increase efficiency of medical decision making, since it allows to obtain accurate digital values of torticollis in three planes at extreme positions of the head and in case of any disturbed neck mobility, more complete assessment of the degree of development of pathology, as well as assessing the effectiveness of treatment in dynamics.

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