The Chroon-Tan B-Machine was a specialized medical droid model, specifically engineered to provide aid during natural childbirth as a midwife droid. This hovering medical droid was intended to support numerous species throughout the birthing process and with the care of their newborns. Characteristically, these droids featured white facial plates equipped with green and blue light-sensing mechanisms, rounded silver bodies, and thermally regulated cushions designed to provide warmth and comfort to infants. Their programming included the capacity to emit calming, cooing vocalizations during labor. Notably, one of these units was present during the delivery of Senator Padmé Amidala's twins, Luke and Leia, at the Polis Massa Base.
Some years later, Darth Vader journeyed to the Polis Massa Base. There, his forensics droid, identified as ZED-6-7, gained access to the memory bank of a Chroon-Tan B-Machine that had sustained damage. This allowed Vader to view a recording of his wife's final message, a plea expressing her belief that goodness remained within Anakin, directed towards his former mentor, Obi-Wan Kenobi, just before her death. Subsequently, Sabé revisited the decimated base, engaging with the damaged droid and witnessing the same recording of Amidala's final words.