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

Claim 0:
1. An electric toothbrush comprising:
a housing;
an output shaft positioned within and extending out of the housing;
a brush head releasably coupled to the output shaft and movable therewith relative to the housing, wherein the output shaft is hollow to deliver fluid to the brush head;
a magnetic assembly positioned within the housing and configured to impart an oscillation motion to the output shaft;
a mass; and
a spring positioned within the housing, the spring including a first end non-rotatably coupled to the housing and a second end non-rotatably coupled to the output shaft and coupled to the mass, wherein the spring twists as the magnetic assembly oscillates the output shaft to amplify the oscillation motion of the output shaft generated by the magnetic assembly, and wherein the spring accommodates a fluid flow path through an interior of the spring to the output shaft.