Patent ID: 8790306

Claim:
An injection equipment which is to be connected to a discharge unit capable of discharging a pressured medical liquid, and which fills the medical liquid from the discharge unit and delivers a predetermined amount of the medical liquid according to operation of a user, the injection equipment comprising: an introductory passage which is connectable to the discharge unit and which is used for guiding the medical liquid from the discharge unit; a housing chamber for extrusion which is capable of housing the medical liquid guided by the introductory passage and which is expandable according to the housing of the medical liquid; a housing chamber for injection which can communicate with the discharge unit via an adjustable unit for adjusting a flow rate of the medical liquid discharged from the discharge unit and which expands according to the housing of the medical liquid, and which can deliver the housed medical liquid by being contracted; a delivery passage for guiding the medical liquid delivered from the housing chamber for injection to a patient; a switching valve capable of performing a switching operation between a closed position for preventing the delivery of the medical liquid through the delivery passage, and an open position for allowing the delivery of the medical liquid through the delivery passage; and an operating part capable of switching the switching valve from the closed position to the open position by receiving operation of the use in a state where the predetermined amount of medical liquid is housed in the housing chamber for injection, wherein the housing chamber for extrusion and the housing chamber for injection are mutually connected so that, when one of the chambers expands, the other one of the chambers contracts, wherein, by switching the switching valve to the open position in a state where at least the predetermined amount of medical liquid is filled in the housing chamber for injection, the housing chamber for injection is contracted based on the expansion of the housing chamber for extrusion according to the discharge pressure from the discharge unit so as to deliver the predetermined amount of medical liquid, and wherein the housing chamber for injection and the housing chamber for extrusion generate reactive force in a direction of expanding the housing chamber for injection and also contracting the housing chamber for extrusion in accordance with the introduction of the medical liquid into the housing chamber for extrusion.