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: Proposed is to provide a size-varying bubble complex and a method of preparing the same. More specifically, the size-varying bubble complex and the method of preparing the same are proposed, wherein the bubble complex is capable of being repeatedly varied in size by changing phases of perfluorocarbon by external stimuli, by including a shell that encapsulates a core made of the perfluorocarbon and protects the core by expanding and contracting together when the core expands and contracts.

Abstract: Proposed is to provide a size-varying bubble complex and a method of preparing the same. More specifically, the size-varying bubble complex and the method of preparing the same are proposed, wherein the bubble complex is capable of being repeatedly varied in size by changing phases of perfluorocarbon by external stimuli, by including a shell that encapsulates a core made of the perfluorocarbon and protects the core by expanding and contracting together when the core expands and contracts.

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: Proposed is to provide a size-varying bubble complex and a method of preparing the same. More specifically, the size-varying bubble complex and the method of preparing the same are proposed, wherein the bubble complex is capable of being repeatedly varied in size by changing phases of perfluorocarbon by external stimuli, by including a shell that encapsulates a core made of the perfluorocarbon and protects the core by expanding and contracting together when the core expands and contracts.