A cryogenic dewar is a double-walled container with a high-quality vacuum maintained between its inner and outer walls. This vacuum jacket is the key to its performance. Heat transfer in physical systems occurs through three mechanisms: conduction, convection, and radiation. The vacuum between the walls eliminates conduction and convection. The remaining radiation heat transfer is minimised through highly reflective inner surfaces.
The result is a container that can maintain its contents at minus 196 degrees Celsius for days or weeks on a single fill. The nitrogen slowly evaporates as it absorbs the small amount of heat that enters the vessel, but the evaporation rate in a well-designed medical-grade dewar is remarkably low.
For IVF-specific use, several additional factors matter beyond basic insulation performance. The internal configuration determines how many samples can be stored and how easily individual samples can be retrieved without warming the remainder of the vessel. The neck tube design affects both evaporation rate and access ease. Alarm system compatibility determines whether the dewar can be integrated into your monitoring infrastructure.
IVF dewars also need to be compatible with the specific carrier systems used in vitrification. Speaking to a specialist supplier before purchasing is strongly recommended.
Cryolab supplies IVF-specific cryogenic storage dewars with full specification guidance for UK fertility clinics. Visit cryolab.co.uk“>Cryolab
