Subcutaneous injection set with secondary injection septum

A method of infusing two different medication streams into a target area/tissue through a single subcutaneous pathway, comprising:

• inserting a distal end of an infusion cannula into a target area/tissue, the infusion cannula being supported by a housing at its proximal end;
• attaching a connecting hub to the housing, the connecting hub having an internal Y-shaped flow channel structure comprising first, second and third flow channels which intersect within the connecting hub;
• introducing a first substance stream through a delivery tube and into the second flow channel;
• and
• introducing a second substance stream through a septum and into the third flow channel, the second and third flow channels intersecting into the first flow channel such that the first and second substance streams pass together out of the first flow channel, passing into the patient through the housing and infusion cannula.