Patent ID: 9743749
Date: 2017-08-29
CPC Classifications: A46B,A61C

Claim:
1. A dental cleaning appliance comprising: a handle; a fluid reservoir for storing a working fluid, the fluid reservoir being at least partially delimited by a wall and a movable member which is moveable relative to the wall to vary the volume of the fluid reservoir; a fluid delivery system for receiving working fluid from the fluid reservoir, and for delivering the working fluid to the teeth of a user; and an expansion chamber located adjacent to the moveable member and which increases in volume as the volume of the fluid reservoir decreases, through movement of the moveable member relative to the wall, as working fluid is supplied to the fluid delivery system, the expansion chamber being open to the atmosphere to receive ambient air as the volume of the expansion chamber increases; wherein the moveable member comprises a diaphragm which is expandable in response to a pressure difference across the surfaces thereof.