Importance

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Abstract

A single use high-speed turbine dental drill handpiece, comprising: a head (1), a drilling needle (2), a front handle (3), a back handle (4), and a quick disconnect water and air adapter (13). The front end of the back handle (4) is connected with the front handle (3), the back end is connected with the quick disconnect water and air adapter (13). The back handle (4) has a solid monolithic structure with an inner through channel and is made of engineering plastics formed by single stage moulding. A water pipe passage (41) is set at the axle center of the front portion of the back handle (4), an air pipe passage (42) and an air return passage (43) are set at the eccentric position along the axial direction. An air pipe (5) and a water pipe (6) from the head (1) are inserted into the air pipe passage (42) and the water pipe passage (41), respectively, the clearance space is sealed by a sealing ring. The center of the rear end of the back handle (4) is protuberant to form a quick disconnect inner tube (45) having a center channel. The inner end of the center channel of the quick disconnect inner tube (45) is connected with a check valve (14). The check valve is inserted into the water pipe passage (41) at the front portion of the back handle (4). The outer wall of the valve body (144) of the check valve (14) contacting with the inner wall of the water pipe passage (41) is embedded with a sealing ring. The outlet of the air return passage (43) is located at a position between the outer wall of the back handle (4) and the quick disconnect inner tube (45).

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First Claim