In the present invention, provided are an elastic blocking side for preventing backflow, which plays a role in preventing backflow, and an injection set with the same wherein the elastic blocking side for preventing backflow is installed in a connection pipe (30) whose both end parts are connected to a tube for providing liquid (T) and an injection (N) respectively. The elastic blocking side for preventing backflow (100) of the present invention plays a role in preventing backflow is a hollow wedge shape and comprises: an opening wedge (110) whose thinner end part is partly opened by receiving liquid and materials are elastic and a plate-shaped flange (120) which is located on one side of the opening wedge (110) and is partly opened to mutually connect the inside of the opening wedge (110).COPYRIGHT KIPO 2015본 발명은 수액의 역류를 방지하는 것으로서 특히 탄성 재질을 이용하여 유체 유입 시 개방되나 역방향의 유체 유입시에는 차단되어 역류를 방지하는 차단변 및 이를 구비한 수액 세트이다.
