Oral hygiene devices employing an acoustic waveguide

Abstract From the Canadian patent

An oral hygiene device having an ultrasound transducer 22 and an acoustic waveguide 24 facilitating the transmission of ultrasonic acoustic energy to fluids in the oral cavity is disclosed. Preferred ultrasound operating parameters for operation in aqueous environments and in dental slurries are disclosed. Devices may incorporate a drive motor 16 for oscillating a device head 23, acoustic waveguide 24 and one or more bristle tuft(s) 26 at sonic frequencies, and preferred sonic operating parameters are also provided. Multielement piezoelectric transducer assemblies 30 40, and various control and , communications features are disclosed. Oral hygiene devices disclosed herein achieve …