A cryogenic dewar is a specialised vacuum-insulated container designed to store or transport cryogenic liquids, most commonly liquid nitrogen, liquid helium, or liquid oxygen, at extremely low temperatures. The basic engineering principle behind a cryogenic dewar has not changed dramatically since James Dewar’s original design in 1892, but the applications have expanded enormously, and so has the range of vessel designs optimised for specific use cases.
In medical and fertility settings, a cryogenic dewar is used to store biological samples including embryos, sperm, eggs, and stem cells. These dewars are designed with sample organisation in mind, featuring canisters, canes, or racks that hold individual cryovials or straws in precise positions. The goal is temperature uniformity and sample traceability, and the design of the vessel reflects those priorities through narrow neck geometry, high-grade vacuum insulation, and compatibility with inventory management systems.
In research settings, a cryogenic dewar is used for everything from preserving cell lines and tissue samples to cooling superconducting magnets and maintaining samples for spectroscopy at cryogenic temperatures. Research dewars often need to accommodate non-standard access configurations or provide ultra-low evaporation rates for experiments that require weeks or months of uninterrupted cold conditions.
In industrial and logistics contexts, a cryogenic dewar is used for transporting cryogenic gases in portable, pressurised or unpressurised formats. Dry shippers, which are a specialised form of cryogenic dewar, are used to transport biological samples internationally using absorbed liquid nitrogen in vapour phase, making them safe to transport by air under IATA regulations without the hazards associated with free liquid.
Understanding what a cryogenic dewar is used for in your specific context is the starting point for selecting the right model. The vessel that is perfect for a biobank is not the same one that works for an IVF clinic, and neither of those is the right choice for field sample collection.
Find the right cryogenic dewar for your application by visiting Cryolab.co.uk or contacting the team directly for a tailored recommendation.
