Looking quickly on Wikipedia shows prior art. Insulin pens were made in 1985, so out of patent protection, and the epipen® goes back to the 70s, from a design for the military for nerve gas antidote. It would be interesting to see exactly what the patent is. Patents are given away like mardi gras beads. Seems like there's zero review in the patent office. Invalid patents abound, and if you can't afford lawyers like a major company can, you can't fight it. Even if you choose to fight it, lawyers can run down the clock by tying things up in court, so even when you win, you lose.