PROBLEM TO BE SOLVED: To provide an injection device preventing fall of a needle from an injection cylinder in use and capable of attaching/detaching an injector.SOLUTION: The injection device includes: a contact head 10 capable of coming into contact with a test object and having an opening through which a needle tube passes, formed thereon a movable holder 30 for holding an injection cylinder and the needle a support mechanism 20 fixed to the contact head a content injection control mechanism 50 for pushing a plunger into the inside of the injection cylinder and a needle removal control mechanism for performing retracting operation of the needle tube. By moving the movable holder along the support mechanism, the injection cylinder and the needle that are attachably/detachably held with respect to the injection device moves to the contact head. The content injection control mechanism, while retracting the needle tube with respect to the test object to a desired position, controls a first-step needle tube retracting operation of pushing the plunger into the injection cylinder and injecting the content into the test object, and a second-step injection tube retracting operation of retracting, without injecting the content into the test object, the needle tube from a prescribed position to at least a surface of the test object and removing the needle.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】使用時に注射筒から注射針の脱落を防ぎ、注射器を脱着できる注射装置の提供。【解決手段】注射装置は、被検体と当接可能で、針管が通過する開口部が形成された当接ヘッド10と、注射筒及び注射針を保持する可動ホルダー30と、当接ヘッドに固定される支持機構20と、押し子を注射筒の内部へ押し込む内容物注入制御機構50と、針管の後退動作を行う抜針制御機構とを備え、可動ホルダーが支持機構に沿って移動することで、注射装置に対して着脱可能に保持された注射筒及び注射針を当接ヘッドに対して移動させる。内容物注入制御機構は、針管を被検体に対して所望の位置まで後退させながら、注射筒内に対して押し子を押し込んで、内容物を被検体に注入する一段階目の針管後退動作、及び、内容物を被検体へ注入せずに、針管を所定の位置から、少なくとも被検体の表面まで後退させ、抜針させる二段階目の針管後退動作を制御する。【選択図】図1
