The CT-4 series medical droid was a class of medical droid produced by Polis Massa Pria Assemblage and sold for 20,000 credits. They were similar to the EW-3 midwife droid, but specialized in producing bacta. As the droids had a non-human shape, they made some patients less easy than 2-1B surgical droids did. The Alliance to Restore the Republic used multiple CT-4 series droids.[1]