Abstract: Provided is a contrast medium injection system that enables easy removal of air bubbles in a drug solution in a flow path, use of inexpensive tubes and measurement of blood pressure in external power outage. The contrast medium injection system includes at least one fluid injection flow path and an opening and blocking unit provided in the fluid injection flow path. The opening and blocking unit includes a generally cylindrical space and a spherical body disposed to be movable between a first end portion and a second end portion opposite to the first end portion in the generally cylindrical space. The spherical body blocks the fluid injection flow path when the spherical body is in close contact with the first end portion. The fluid injection flow path is opened when a state in which the spherical body is in close contact with the first end portion is released.

Abstract: Provided is a contrast medium injection system that allows a connector of a tube connected to a patient to be reliably locked and easily unlocked with a small force and kept clean in normal use. The system includes a detachably attachable injection line kit, at least one fluid injection flow path and a first connector provided on a downstream end of the flow path. The kit includes at least one patient connection flow path and a second connector that is provided on an upstream end of the patient connection flow path and detachably attachable to and engageable with the first connector. The contrast medium injection system body has a first set position where the kit is set and a second set position where the first and second connectors are engaged more deeply than in the first set position.