FLEXIBLE DRIVER SHAFT FOR CAM-DRIVEN PERSONAL HYGIENE DEVICE Russian patent published in 2016 - IPC A61C17/34 

FIELD: medicine.

SUBSTANCE: invention refers to medical equipment and is applicable for personal oral hygiene. A personal hygiene device comprises a direct-current motor with an output rotary shaft, a flexible joining element, a working piece assembly comprising a working piece at its distal end, and a spring hub assembly. The flexible joining element is connected to the output shaft at its proximal end and has a cam mounted at its distal end; the flexible joining element is configured bendable. The spring hub assembly is actuated by the joining element and cam, which transforms a joining element rotation into an oscillation motion of the working piece shaft assembly. The joining element has an elliptical section in its active part, whereas the active part is full-length elliptical and has a smaller size and greater size; the smaller size extends in the bending direction of the joining element when the device is active, whereas the greater size extends perpendicularly.

EFFECT: invention enables the joining element configured as a flexible shaft to resist a bending stress during the acceptable service life and maintain a suitable length.

9 cl, 8 dwg