Cryogenic storage vessel is an insulated container purpose-built to store biological specimens, semen, embryos, oocytes, or industrial gases at cryogenic temperatures, typically between minus 150 and minus 196 degrees Celsius. These vessels use vacuum-insulated double-wall construction, based on the principle of the Dewar flask, to minimise heat ingress and reduce liquid nitrogen evaporation to the lowest possible rate. Without this vacuum insulation, liquid nitrogen would evaporate within hours rather than weeks or months.
Vessel storage solutions are available across a very wide range of sizes, from compact 1 to 3 litre bench-top units used for short-term handling and small-scale transport, through to 500-litre-plus floor-standing vessels with automated liquid nitrogen supply used in large biobanks and industrial facilities. Between these extremes, the 20 to 100 litre range is by far the most common in IVF clinics, veterinary practices, university laboratories, and hospital research departments. The most appropriate size depends on your sample volume, the frequency of access, the interval between liquid nitrogen fills, and the physical constraints of your facility.
Beyond size, the choice of storage vessel involves several other important factors. The neck tube diameter has a significant influence on performance: narrow-neck vessels have a lower evaporation rate and longer static hold time, but wider necks make it easier to access and retrieve specimens without temperature excursions during inventory management. The number of canisters the vessel can accommodate determines its organisational capacity, and this should be matched to your current and projected sample volumes with room for growth.
For clinical IVF use, the vessel must carry appropriate regulatory certifications, and many clinics now operate vapour-phase storage vessels rather than conventional liquid-phase units. In vapour-phase storage, specimens are held above the liquid nitrogen surface in a cold nitrogen vapour environment. This eliminates the risk of cross-contamination between samples through the liquid phase, which is a particular concern for vitrified oocytes and embryos stored in open carrier systems. The temperature in the vapour phase is still well below minus 150 degrees Celsius, which is sufficient for long-term specimen preservation.
Connectivity to monitoring infrastructure is another key consideration. Modern cryogenic storage vessels should be compatible with continuous LN2 level sensors, temperature probes, and alarm systems that can send automated alerts to staff in the event of a liquid nitrogen level drop or temperature excursion. In HFEA-regulated facilities, continuous monitoring and alarm documentation is a mandatory requirement. For veterinary and research settings, monitoring is equally important for specimen security even where it is not formally mandated.
View our range of certified cryogenic storage vessels for clinical, veterinary, biobanking, and research use across the UK.
