HEAD ASSEMBLY FOR DENTAL CONTRA-ANGLE HAND-PIECE AND DENTAL CONTRA-ANGLE HAND-PIECE
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United States of America Patent
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Issued Date -
Jul 21, 2022
app pub date -
Apr 8, 2022
filing date -
Jan 7, 2021
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Abstract
A head assembly for a dental contra-angle hand-piece and a dental contra-angle hand-piece are provided. The head assembly includes a hand-piece main body, a reversing valve movably connected to the hand-piece main body, and an inner water tube connected to the hand-piece main body, wherein the hand-piece main body is provided with a first flow channel and a second flow channel independent from each other, the first flow channel is configured to be in communication with a liquid outlet of a motor, and the second flow channel is configured to be in communication with an external pipeline; the reversing valve is provided with a confluence channel, the reversing valve is configured to enable, when moving relative to the hand-piece main body, the first flow channel and the second flow channel to alternatively be in communication with the inner water pipe through the confluence channel.
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