A few large boxes full of futuristic medical equipment, along with their instruction manuals, including a 3-D printer with supplies for creating all kinds of things from splints and supports made from some sort of plastic to sterile materials that can be used to create frames inside the body to help encourage bones to knit together and so on.
There are also boxes full of basic medical supplies, medication, plenty of goobers full of medical papers from the past fifty years (from Miguel's point of view - back to 2049) for some light reading during down-time, and three cases of vaccines, three identical sets. These include diseases that have not yet been discovered in 2018, a number of different cancers, Aids and HIV, and a number of other diseases. Still nothing for the common cold, though.
Miguel has left detailed notes on a tablet for everything he's brought back. And a hand-written one on a piece of paper that just says "ENJOY!"