Method for freezing a liquid
A method for freezing a liquid located in a container, in particular a liquid drug, includes exposing the container to a cooling element such as cold gas in order to freeze the liquid. The cold gas preferably flows around the container, and/or the liquid is cooled in another way in order to freeze the liquid. The container is insulated at a surface of at least one first volume portion of the container, and the container is cooled nearly immediately at a surface of a second volume portion of the container by the cold gas such that the liquid freezes through later in the at least one first volume portion than in the second volume portion.
1. A method of freezing a liquid drug disposed in a container, the method comprising:
cooling the container for freezing the liquid drug;
insulating the container at a surface of a first volume portion of the container by fitting an insulation body on the surface of the first volume portion in a lateral direction; and
cooling the container by applying a cooling element at a surface of a second volume portion of the container, the second volume portion being located at a center of the container and the first volume portion extending from the center of the container to the edges of the container;
wherein the container is cooled so that the liquid drug freezes therethrough in the first volume portion later than in the second volume portion.
2. The method according to claim 1 , wherein the container has a cuboidal shape, and a height of the cuboidal container is less than a quarter of at least one of (i) a width and (ii) a length of the cuboidal container.
3. The method according to claim 1 , wherein the insulation body has a U-shaped cross-section.
4. The method according to claim 1 , wherein the container includes a flexible inner container holding the liquid drug and a rigid outer container.
5. The method according to claim 4 , wherein the container includes a foam between the inner container and the outer container, the foam being configured to compensate for an expansion in the volume of the liquid drug upon freezing.
6. The method according to claim 5 , wherein the foam has a decreasing elasticity with decreasing temperature below the freezing point.
7. The method according to claim 5 , wherein the foam is configured to harden at a temperature between 0° C. to −30° C.
8. The method according to claim 7 , wherein the foam is configured to harden at a temperature between −10° C. and −20° C.
9. The method according to claim 5 , wherein the foam is configured to harden, and is configured so that a process of hardening is reversible.
10. The method according to claim 5 , wherein the outer container is lined with the foam such that the inner container is completely surrounded by the foam when the inner container is arranged in the outer container.
11. The method according to claim 10 , wherein the foam comprises a foam block in the outer container for receiving attachments.
12. The method according to claim 5 , further comprising supplying an additional layer of foam in the outer container when the inner container is filled only partially to capacity.
13. The method according to claim 5 , wherein the foam is an elastic foam to completely compensate for an expansion in the volume of the liquid drug upon freezing.
14. The method according to claim 1 , wherein the container includes a top side and an underside formed of a metal plate.
15. A method of freezing liquid drugs in a plurality of containers, the method comprising freezing the liquid drugs in the containers at the same time in a mutually superposed relationship in a freezing apparatus, the freezing of the liquid drug in each of the containers being performed according to the method of claim 1 .
16. An arrangement for carrying out the method according to claim 1 , the arrangement comprising:
the container filled with the liquid drug, and
the insulation body arranged at the surface of the first volume portion of the container, wherein the surface of the second volume portion of the container is insulation-free.
17. A freezing apparatus comprising:
one or more arrangements, each of the one or more arrangements being configured according to claim 16 , the one or more arrangements being arranged within a freezing apparatus in mutually superposed relationship, the freezing apparatus being adapted to freeze the liquid drug within the container.
18. The method according to claim 1 , wherein the cooling element is a cold gas, the container being exposed to the cold gas such that the cold gas flows around the liquid drug.