A balloon assembly (200) that can be attached to a band assembly (300) to form a hemostasis band (100) used to perform hemostasis on a puncture site (89) of a human being (90). The balloon assembly (200) can include a balloon (210) that provides for being inflated to apply pressure to the puncture site (89), one or more openings (220) that provides for the insertion of the band assembly (300), and an inlet (230) for inflating the balloon (210).