Patent ID: 11864965
Assignee: WATER PIK, INC.
Field: Medical technology (Instruments)
Classification: CPC A  H | IPC A  H

Claim 13:
14. An electric toothbrush comprising:
a handle housing;
a hollow output shaft having an inlet end and an outlet end, wherein the inlet end is positioned within the housing, and wherein the outlet end extends out of the housing and is connectable to a brush head;
first and second permanent magnets positioned within the housing and fixed to opposing sides of the output shaft so as to rotate therewith;
first and second electromagnets fixed in position relative to the housing and positioned on opposing sides of the output shaft;
a spring including a first end non-rotatably connected to the housing, a second end non-rotatably connected to the inlet end of the output shaft, and a plurality of beams extending from the first end of the spring to the second end of the spring;
a mass non-rotatably connected to the second end of the spring and formed from a different material than the spring; and
a fluid tube routed through the first end of the spring and coupled to the inlet end of the output shaft within the spring to deliver fluid to the brush head.