PROBLEM TO BE SOLVED: To provide a disposable self-shielding syringe can be handled easily with one hand. A And provided with the syringe body and the plunger rod and the needle at least with a syringe, a cylindrical body, and the shielding cylinder, an annular latching member, the spring member and, The claw portion of the annular latching member, the is the spring member is compressed between the pawl portion of the annular latching member and the flange portion of the cylindrical body portion and by acting on the tip of the spring material, prior to the syringe body needle which is installed in the unit, is exposed from the shield tube, And attract the shielding cylinder in the rear direction of said syringe body, latch releasing portion of the shielding barrel, push the claw portion of the annular latch member to the outside direction of the annular latch member, the claw portion of the annular latch member is off from the spring material, the shielding barrel, the move in a direction to shield the needle by the repulsive force of the spring material, the injection needle is installed at the front of the syringe body is shielded by the shielding cylinder , disposable self-shielding syringe. [Selection Figure] Figure 17【課題】片手で簡単に取り扱うことのできる使い捨て自己遮蔽注射器を提供すること。【解決手段】 注射器本体とプランジャーロッドと注射針とを少なくとも備えた注射器と、筒状本体と、遮蔽筒と、環状ラッチ部材と、バネ材と、を備え、 前記環状ラッチ部材の爪部が、前記バネ材の先端に掛かることにより前記筒状本体部の鍔部と前記環状ラッチ部材の爪部との間で前記バネ材が圧縮され、前記注射器本体の前部に設置された注射針が、前記遮蔽筒から露出し、 前記遮蔽筒を前記注射器本体の後部方向に引き付けると、前記遮蔽筒のラッチ解除部が、前記環状ラッチ部材の爪部を前記環状ラッチ部材の外部方向へ押し広げ、前記環状ラッチ部材の爪部が前記バネ材からはずれ、前記遮蔽筒が、前記バネ材の反発力により前記注射針を遮蔽する方向に移動して、前記遮蔽筒により前記注射器本体の前部に設置された注射針が遮蔽される、使い捨て自己遮蔽注射器。【選択図】図17
