Oocyte vitrification carriers are specialist devices used to load and cryopreserve mature human oocytes by the vitrification method. The carrier performs two simultaneous functions: it holds the oocyte in an ultra-small volume of vitrification solution to facilitate the extremely rapid cooling rate required for true vitrification, and it provides the physical support needed to identify, store, retrieve, and warm the oocyte safely without risk of loss or damage. Carrier design is fundamental to vitrification outcomes.
The most important distinction in the vitrification carrier market is between open and closed systems. In an open carrier, the oocyte is plunged directly into liquid nitrogen without a protective outer seal, achieving the maximum possible cooling rate. Closed carrier systems incorporate a hermetic outer seal applied before the carrier contacts liquid nitrogen, preventing any direct contact between specimen and cryogenic medium. For HFEA-licensed UK clinics seeking to minimise all theoretical biosafety risks, a closed system represents the most defensible clinical choice. Cryolab supplies the CBS High Security Vitrification Kit, which provides a closed, hermetically sealed vitrification system with full traceability documentation.
Carriers also differ in loading volume, surface texture, goblet design, and compatibility with different vitrification solution brands. The warming protocol must be carefully matched to the specific carrier and solution system in use, as mismatched protocols are among the most common causes of suboptimal survival rates. All staff performing vitrification must be trained to the specific carrier and solution combination in their programme with competence formally assessed.
Oocyte survival rates with optimised vitrification protocols in experienced programmes now routinely exceed 90 percent. Explore our certified range of oocyte vitrification equipment and consumables including the CBS High Security Vitrification Kit for IVF and reproductive biology programmes across the UK.
