Infusion balloon catheter (100 200) with fortified proximal infusion outlet port (106 206) and manufacturing thereof. Infusion balloon catheter includes: inflatable balloon member (102 202) shaft (101 201) having distal end (103 203) attached to balloon member and shaft wall enclosing: first lumen (104 204) providing passage to balloon inflation fluid and second lumen (105 205) providing passage to infusion fluid and guidewire (GW) and bending resistant insert member (107 207 300a f 400a b) housed in second lumen and located proximally to balloon member insert member is affixed to and conforms to shape of shaft inner wall surface and includes one or more opening(s) (108 208). Shaft wall has infusion outlet port located along and providing opening to second lumen proximally to balloon member. Insert opening(s) is/are in direct fluid communication with infusion outlet port whose cross sectional area is larger than that of infusion inlet opening. Bending resistant insert member provides fortifying structural support to shaft wall portion surrounding infusion outlet port. Applicable to medical procedures involving injection of imaging contrast material or/and drugs.
