Patent ID: 7172576

Claim:
A medicinal-liquid injection apparatus, comprising: a tubular main body which is insertable in a body of a living being and which has an inner lumen and a projection hole through which the lumen opens outward; a tubular member which includes a needle portion as a free end portion thereof, which is supplied with a medicinal liquid, and which is insertable in the lumen of the tubular main body such that the tubular member is movable in an axial direction of the tubular main body and the needle portion is caused to project outward through the projection hole of the tubular main body; and a protection member, which includes an insertion portion, which is detachably inserted in an inner hole of the tubular member, and a flexible portion, which is arranged in an end of the insertion portion and which projects out of an opening of a tip of the needle portion of the tubular member in a state in which the insertion portion is inserted in the inner hole of the tubular member so that the flexible portion is interposed between the inner circumferential surface of the lumen and the tip of the needle portion of the tubular member, wherein when the flexible portion exits the tubular member and contacts the inner circumferential surface of the lumen, the flexible portion urges the tip of the needle portion away from contact with the inner circumferential surface of the lumen, and when the needle portion of the tubular member is caused to project out of the projection hole of the tubular main body so as to puncture a tissue of the body of the living being in a state in which the tubular main body is inserted and located in the body of the living being, the medicinal liquid supplied through the tubular member is injected to the tissue of the body in a state in which the protection member is removed from the tubular member.