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Ultrasonic toothbrush

  • US 5,138,733 A
  • Filed: 03/25/1991
  • Issued: 08/18/1992
  • Est. Priority Date: 03/25/1991
  • Status: Expired due to Term
First Claim
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1. A dental hygiene device for use with a dentifrice, comprising:

  • A. a rigid elongated member of non-conductive material having a handle end and a bristle end;

    B. a piezoelectric transducer secured to the elongated member adjacent the bristle end for contracting and expanding volumetrically in response to a changing electrical field generating vibrations of ultrasonic frequency operative to cause mild cavitation in the dentifrice to loosen soft plaque on the surface of the teeth without appreciable relative movement of the bristle end with respect to the handle end;

    C. means coupled to the piezoelectric transducer operative for generating ultrasonic frequency electrical signals and transmitting said signals to said piezoelectric transducer;

    D. A plurality of bristle clusters for carrying dentifrice and being secured to the handle of the elongated member adjacent the piezoelectric transducer, said bristle clusters to be received within the human mouth for conducting said vibrations to the dentifrice and moved across tooth and gingival surfaces for dislodging the loosened soft plaque therefrom.

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