Abstract: Proposed are a contrast agent containing an iodinated unsaturated fatty acid ethyl ester derived from vegetable oil, a non-iodinated unsaturated fatty acid ethyl ester, and sulfur dioxide (SO2), and a production method thereof. The contrast agent having a similar contrast effect is synthesized using vegetable oil as a substitute for poppy seed oil, which is unstable in terms of supply and is expensive. In addition, the long-term stability problem of an iodine-based contrast agent is solved by adding a non-iodinated unsaturated fatty acid ethyl ester and sulfur dioxide.

Abstract: An apparatus for preventing backflow includes a body forming an accommodating portion which forms a transport passage of a fluid inward, wherein the accommodating portion comprises a double backflow prevention chamber to prevent backflow of the fluid, and a double backflow prevention member provided in the accommodating portion and stepwise implementing opening and closing of the double backflow prevention chamber, In particular, the accommodating portion includes an inflow chamber provided at an upper portion of the body and into which the fluid flows; a discharge chamber through which the fluid is discharged to a lower portion of the inflow chamber; and the double backflow prevention chambers respectively provided at the lower portion of the inflow chamber and the upper portion of the discharge chamber.

Abstract: An apparatus for preventing backflow. The apparatus includes a housing; a trap flow part forming a flow passage for a medical fluid, a discharge part provided on an lower portion of the housing and to receive the medical fluid from the trap flow part and to discharge the medical fluid; a backflow prevention chamber part provided between the trap flow part and the discharge part; and a plate-shaped backflow prevention member provided on one surface of the inner side of the backflow prevention chamber part connected to the trap flow part and in close contact with a periphery of the outlet opening, the plate-shaped backflow prevention member being provided to open or close the opening depending on forward flow and the backflow of the medical fluid.

Abstract: An apparatus for preventing backflow includes a body forming an accommodating portion which forms a transport passage of a fluid inward, wherein the accommodating portion comprises a double backflow prevention chamber to prevent backflow of the fluid, and a double backflow prevention member provided in the accommodating portion and stepwise implementing opening and closing of the double backflow prevention chamber, In particular, the accommodating portion includes an inflow chamber provided at an upper portion of the body and into which the fluid flows; a discharge chamber through which the fluid is discharged to a lower portion of the inflow chamber; and the double backflow prevention chambers respectively provided at the lower portion of the inflow chamber and the upper portion of the discharge chamber.