PRESSURE SENSING ELECTRIC TOOTHBRUSH Russian patent published in 2018 - IPC A61C17/22 

FIELD: medicine.

SUBSTANCE: invention relates to the field of medical equipment and is intended for cleaning teeth. Electric toothbrush with a pressure sensor comprises a drive mechanism, a magnet, systems respectively including first and second Hall sensors and a processing system. Drive mechanism in response to a drive signal generates a cleaning action by means of the bristles of the cleaning head unit connected to the toothbrush. Magnet is connected to the rear end of the drive mechanism. System comprising first Hall sensor is intended to be used to determine the value of the forward force generated by the pressure exerted on the teeth of the user from the bristles of the cleaning head unit, while applying force to the bristles, the rear end of the drive mechanism rotates with the magnet, which creates a lateral displacement of the magnet in the direction of the first Hall sensor. System including the second Hall sensor is intended for use in determining the value of the dynamic force generated by the pressure applied to the user's teeth by the bristles of the cleaning head unit, wherein said second Hall sensor determines the phase change between the drive signal and the mechanical response of the cleaning head unit created by the displacement of the magnet when the pressure on the bristles changes. Processing system in response to (i) the result of measuring the forward force generated by the pressure, and (ii) the result of measuring the dynamic force generated by the pressure, regulates the trigger point so that it either (a) remains unchanged, or (b) decreases with respect to a preset trigger point of 300 grams or another set value, wherein the trigger point corresponds to a pressure value indicative of the application of excessive force from the bristles to the user's teeth with respect to the dynamic loads generated by the different portions of the user's oral cavity.

EFFECT: invention makes it possible to more accurately determine the force of bristle pressure of a toothbrush that a user applies to the teeth by using two Hall sensors.

13 cl, 10 dwg