| 摘要 |
A cordless endodontic filling instrument for back<img id="CUSTOM-CHARACTER-00001" he="2.12mm" wi="1.78mm" file="US20080193895A1-20080814-P00001.TIF" img-content="character" img-format="tif"/> filling is disclosed which uses a switching circuit enabling the filling instrument to be operable using a small dry battery for supply DC power, and enabling the filling instrument to sense variation in capacitance and to control operation of heating wire based on the sensed capacitance variation. The filling instrument includes a body having a pen shape to enable an operator to easily grasp the body, includes a DC power source and a main printed circuit board arranged in the body, a heat generating tip extending forwardly from the body and heating and melting gutta-percha to fill a root canal with the melted gutta-percha, and a touch switch arranged at a front portion of the body to sense variation in capacitance occurring when the operator touches the touch switch, and to turn on the heat generating tip based on the sensed capacitance variation.
|
