Coupling component for transmitting medical substances

A method for conveyance of medical fluids to an infusion bag, comprising the steps of:

• connecting a first coupling component having two channels for conveyance of medical fluids in two opposite directions to a second coupling component of the infusion bag, wherein said first coupling component is provided with an opening for injection of a medical substance to a first of said two channels, wherein said opening is closed with a first piercable flexible membrane for abutting cooperation with a second flexible membrane of an injection component that is connectable to said opening, said second coupling component having a third channel with a lumen, said third channel is provided with a breakable fluid barrier that is arranged to remain intact during connection and upon complete engagement of the first coupling component to the second coupling component, wherein the breakable fluid barrier is contained within the lumen of the third channel;
• connecting the first coupling component and the second coupling component of the infusion bag allowing said second flexible membrane to be held against said first flexible membrane with a pressure exceeding the yield point of the first membrane and second membrane, and opening the infusion bag towards said two channels after the first coupling component and the infusion bag have been connected to each other, for enabling conveyance of a medical fluid into the infusion bag via one first of said two channels.