Varying from a medikit to a full-fledged diagnostic computer, the Imperial Medi-Pack generally helps an Astra Militarum medic to heal wounded or ill troopers in a battle zone. Sometimes in particularly vicious and dangerous war zones, medics will have to scrounge for medical supplies and beg for drugs from aid stations and passing Munitorum cargo transports.
Basic Medi-Pack kits will usually contain drugs and bandages to treat a variety of injuries and illnesses, such as cataplasm patches and contraseptics. More advanced models might include a diagnostic Cogitator with bio-scanner and probes to determine the patient's ailments. The most advanced types, available to the elite of the Imperium, can include cast sprays, tox wands, synthskin applicators and more.
The Narthecium is another variant of a medi-kit/medi-pack used by Space Marine Apothecaries though these more advanced devices have fully automated functions. They carry drugs and equipment that is geared for the hardier transhuman constitution of a Space Marine, and thus can be dangerous to use on normal humans. The Narthecium also includes a Reductor, which allows the Apothecary to withdraw the precious gene-seed from a fallen Space Marine so that it returns to the Chapter to create new Initiates.
Sisters of the Orders Hospitaller have a scaled-down version of the Space Marine Narthecium, usable on normal human anatomy -- and, in the service of the Inquisition, for torture. Many an Imperial servant has had reason to thank the gentle touch of the Hospitaller, and many an Imperial enemy has come to rue this "gentleness."
- Codex: Imperial Guard (3rd Edition, 2nd Codex), pg. 35
- Dark Heresy Core Rulebook (RPG), pg. 148
- Only War Core Rulebook (RPG), pg. 202
- Rogue Trader Core Rulebook (RPG), pg. 142