PROBLEM TO BE SOLVED: To provide a syringe for dental anesthesia which minimizes the pains and burdens of a patient by optimally controlling the insertion speed and insertion distance, etc., of an injection needle.SOLUTION: The syringe for dental anesthesia, in which the injection needle for injecting anesthetic solution to an injection portion is housed in a handpiece, is provided with: a drive motor 102 as a power source for moving the injection needle 120 forward and backward to the handpiece 1 an encoder 102A and a speed detection part 205 for detecting the insertion speed of the injection needle 120 to gingiva T1 a position sensor 115 for detecting the position of the injection needle 120 a load sensor 107, a load amplifier 207 and an insertion pressure detection part 222 for detecting a pressure applied to the injection needle 120 and a speed/distance control part 221 and a motor control part 206 for controlling the insertion speed and moving distance of the injection needle 120 by controlling the drive motor 102 so that an insertion speed detection value matches with an insertion speed setting value and the position detection value of the injection needle 120 corresponds to a moving distance setting value.COPYRIGHT: (C)2009,JPO&INPIT【課題】注射針の刺入速度や刺入距離等を最適に制御可能として患者の苦痛や負担を最小限にとどめた歯科麻酔用注射器を提供する。【解決手段】注射部位に麻酔液を注入するための注射針がハンドピースに収容されてなる歯科麻酔用注射器において、注射針120をハンドピース1に対して前進、後退させる動力源としての駆動モータ102と、歯肉T1への注射針120の刺入速度を検出するエンコーダ102A,速度検出部205と、注射針120の位置を検出する位置センサ115と、注射針120に加わる圧力を検出する荷重センサ107,荷重アンプ207,刺入圧力検出部222と、刺入速度検出値が刺入速度設定値に一致し、かつ、注射針120の位置検出値が移動距離設定値に対応するように、駆動モータ102を制御して注射針120の刺入速度、移動距離を制御する速度・距離制御部221,モータ制御部206と、を備える。【選択図】図2
