A delivery device is provided for introducing a fluid to a patient. The delivery device has a base with a bottom face for attaching to the skin of the patient, and a cannula extending from the bottom face for penetrating the skin of the patient. A fluid supply conduit has a first lumen connected to the cannula for supplying the fluid to the cannula, where the fluid contains an active agent and stabilizing agent. The conduit has a second lumen with an open end for capturing leakage of the fluid from the infusion site and carrying the fluid away from the infusion site. The second lumen has a leak detector containing a color changing in an amount to react with the stabilizing agent and produce a visual indication to the patient through the conduit. The leak detector is spaced from the infusion site and oriented in a location visible by the patient through the conduit.
