PROBLEM TO BE SOLVED: To provide an injection tool capable of reducing the force required of a user to inject a liquid medicine.SOLUTION: The injection tool includes: a storage chamber S1 capable of storing the liquid medicine fed from a liquid medicine pump 2 via a flow controller 3 a coil spring 9 capable of being elastically deformed while storing the energization in the expansion of the storage chamber S1 an emission tube L3 for guiding the liquid medicine emitted from the storage chamber S1 onto a patient side a switching valve 8 capable of switching the position between a closing position to block emission of the liquid medicine through the emission tube L3 and an open position to permit emission of the liquid medicine through the emission tube L3 and an operation member 12 capable of switching the position of the switching valve 8 from the closing position to the open position when receives the operation from a user. When the position of the switching valve 8 is switched to the open position by using the operation member 12, the storage chamber S1 is contracted with the energization force stored in the coil spring 9 to emit the liquid medicine stored inside the storage chamber S1 to outside.COPYRIGHT: (C)2011,JPO&INPIT【課題】薬液注入のために使用者に要求される力を軽減することができる注入用具を提供すること。【解決手段】流量制御器3を介して薬液ポンプ2からの薬液を収容可能な収容室S1と、収容室S1の拡張に伴い付勢力を蓄えつつ弾性変形可能なコイルばね9と、収容室S1から導出された薬液を患者側へ導くための導出チューブL3と、導出チューブL3による薬液の導出を阻止する閉鎖位置と、導出チューブL3による薬液の導出を許容する開放位置との間で切換可能な切換弁8と、使用者の操作を受けることにより切換弁8を閉鎖位置から開放位置に切換可能な操作部材12とを備え、操作部材12を用いて切換弁8を開放位置に切り換えることにより、コイルばね9に蓄えられた付勢力によって収容室S1を縮小させて当該収容室S1内に収容された薬液を導出させる。【選択図】図1
