Cryodevices developed for minimum volume cooling vitrification of bovine oocytes

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  • Shinichi Hochi
    Faculty of Textile Science and Technology Shinshu University Ueda Nagano Japan

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<jats:title>Abstract</jats:title><jats:p>Unfertilized bovine oocytes can be efficiently cryopreserved only when an extremely rapid cooling rate (>20,000°C/min) is applied to oocytes with a very limited amount of surrounding vitrification solution. This protocol is defined as minimum volume cooling (MVC) vitrification. Various types of cryodevices, such as open pulled straw, Cryoloop, and Cryotop, have been developed to accelerate the cooling efficacy. Furthermore, hollow fibers with nano‐scale pores, triangle nylon mesh sheets, and multilayer silk fibroin sheets have been optimized for the loading of large quantities of oocytes and/or the subsequent removal of excess vitrification solution, without requiring skillful operation to transfer individual oocytes using fine capillaries. This article provides an up‐to‐date review of cryodevices suitable for the MVC vitrification of bovine oocytes at the immature (germinal vesicle‐) and mature (metaphase II‐) stages.</jats:p>

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