Introduction of Cryotop in liquid nitrogen

Once the eggs have been treated with the cryoprotective substances and placed on the vitrification support (the Cryotop), they can be placed in a tank with liquid nitrogen for vitrification.

Then, the lid of the Cryotop must be carefully placed on it without removing it from the liquid nitrogen and stored in the tank where the eggs will remain until the woman wants to use them.