| 摘要 |
A power driven dental toothbrush mechanism is provided having a suitable power source such as a water turbine motor or an electric motor operating through a drive shaft and gear train assembly to accomplish controlled rotation of a plurality of gear driven bristle tufts. A brush head assembly is releasably connected to a motor housing structure and defines an internal gear chamber within which is located a plurality of bristle tuft gears and drive gears therefor. The toothbrush mechanism incorporates a flushing water supply passage in communication with a water inlet source and which transitions the joint between the brush head and housing structure and opens into the internal gear chamber. The brush head and housing structure also define a flushing water exhaust passage in communication with the internal gear chamber of the brush head opposite the flushing water inlet. The flushing water exhaust passage extends through the brush head and a portion of the housing structure and terminates at an exhaust port that is located on the housing structure in a position that is easily engaged by a finger of the user. The brush head is provided with a water outlet valve which is preferably a normally closed, pressure responsive valve that is opened when water pressure within the internal gear chamber is increased to a predetermined value by user placement of a finger over the flushing water outlet port.
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