PROBLEM TO BE SOLVED: To provide a medical powder intracorporeal injection device with a novel structure which, when a medical powder such as an antiadhesive material is injected into a body along with an aseptically introduced pressure gas, can prevent the backflow of the gas introduced into the body even during an endoscopic surgery or the like.SOLUTION: Provided is a medical powder intracorporeal injection device 10 for injecting a medical powder along with a pressure gas, the injection device having anti-backflow means 46 attached to an injection passage 28 for preventing the backflow of the gas introduced into a body such that the backflow of the introduced gas can be prevented even when the pressure gas is being not supplied to the injection device.SELECTED DRAWING: Figure 1【課題】癒着防止材などの医療用粉体を無菌的に導入された圧力気体と共に体内へ噴射するに際して、例えば内視鏡下の手術等においても、体内へ導入した気体の逆流を防ぐことのできる、新規な構造を備えた医療用粉体の体内噴射装置を提供すること。【解決手段】医療用粉体を圧力気体とともに噴射する医療用粉体の体内噴射装置１０において、噴射通路２８に体内へ導入した気体の逆流を防ぐ逆流防止手段４６が設けられており、噴射装置に圧力気体が供給されていない状態でも体内へ導入した気体の逆流を防止することのできるようにした。【選択図】図１
