PROBLEM TO BE SOLVED: To provide a medical device capable of more surely delivering powdered medicine into a lung.SOLUTION: A medical device 1 that is inserted from a body surface of a patient, reaches lung parenchyma and removes air in the lung parenchyma to the outside of a living body comprises: a cylindrical body 2 that has both end surfaces opened and forms a flow passage 20 of air inside a medicine storage part 21A that is provided in a partition wall of the cylindrical body 2 and stores medicine to be delivered into the lung parenchyma and medicine administration means 3 that delivers the medicine in the medicine storage part 21A into the lung parenchyma according to a breathing motion of the patient.COPYRIGHT: (C)2014,JPO&INPIT【課題】肺内により確実に粉末状の薬剤を投与することのできる医療器具を提供すること。【解決手段】患者の体表面から挿入されて肺実質に至り、肺実質内の空気を生体外へと脱気する医療器具1は、両端面が開口され、内部に空気の流路20が設けられた筒状本体2と、筒状本体2の隔壁内部に設けられ、肺実質内に投与する薬剤を収納する薬剤収納部21Aと、患者の呼吸動作に応じて、薬剤収納部21A内の薬剤を、肺実質内に投与する薬剤投与手段3とを備えている【選択図】図1