A plunger-driven delivery device for use with a feeding tube for delivering an ingestible material to a user is provided. The delivery device includes a device body having a first chamber, a second chamber and an exit orifice through which the ingestible material is delivered to the feeding tube. A first plunger is disposed in the first chamber, and a second plunger is disposed in the second chamber. The delivery device can be provided with an ingestible material disposed in the first chamber and a flushing liquid disposed in the second chamber. The delivery device is operable to provide sequential delivery first of ingestible material and then flushing liquid into a feeding tube. In some embodiments, a mechanical interlock is disposed between the first and second plungers to prevent use of the second plunger until the first plunger has been depressed. In additional embodiments, a first passage is defined between the first chamber and the exit orifice and a second passage is defined between the second chamber and the exit orifice. The second passage has a longer passage length than the first passage, allowing delivery of the ingestible material into the feeding tube before flushing liquid is ejected from the delivery device. A method of delivering ingestible material to a user through a feeding tube is also provided.
