| 摘要 |
<p>A single-use and high-speed turbine handpiece for dental drill includes a head (1), a drilling needle (2), a front handle (3), a back handle (4), an air and water quickly-inserting adapter (13). The front end of the back handle (4) is connected with the front handle (3), and the back end is connected with the air and water quickly-inserting adapter (13). The back handle (4) is a solid integral structure with passages passed through, which is die formed by engineering plastics at a time. A water tube passage (41) is provided at the axial center position at the forehead of the back handle (4), and an air tube passage (42) and an air return passage (43) are provided at the axially eccentric position. An air tube (5) and a water tube (6) from the head (1) are inserted into the air tube passage (42) and the water tube passage (41) respectively, and gaps are sealed by gaskets. The back end of the back handle (4) protrudes at the center, and forms a quickly-inserting inner tube (45). The inner end of the central passage of the quickly-inserting inner tube (45) is connected with a one-way valve (14) which is inserted into the water tube passage (41) at the forehead of the back handle (4). The outer wall of the valve body (144) of the one-way valve (14) contacted with the inner wall of the water tube passage (41) is embedded with a gasket. The outlet of the air return passage (43) lies between the outer wall of the back handle (4) and the quickly-inserting inner tube (45).</p> |
