A new vitrification device that absorbs excess vitrification solution adaptable to a closed system for the cryopreservation of mouse embryos.

Several closed vitrification devices that avoid contact with liquid nitrogen have been reported. Recently, based on the Kitasato Vitrification System (KVS), we developed the Closed-KVS, which is a closed vitrification device. The KVS is an open vitrification device that can absorb excess vitrification solution.