Manual personal hygiene device with a treatment instrument which can be driven by ultrasonic vibrations

摘要

The manual device has an ultrasonic motor (5) which causes the treatment instrument, preferably a plug-on toothbrush (2, 3) to execute ultrasonic vibrations, and an electrical switch (8, 9) which is actuated when a predetermined contact pressure exerted on the instrument is exceeded and switches on a buzzer (11) or an optical signal emitter. In fact, since ultrasonic vibrations are greatly attenuated by the bristles of toothbrushes and thus are virtually ineffective if the bristles are loaded with a force higher than about 1N the user notices in this way that he/she exerts excessive pressure on the device. The manual device can also be fitted with an additional vibrator which drives the treatment instrument at the mains frequency or at twice the mains frequency and is designed in such a way that its vibrations are blocked when the critical contact pressure is exceeded.