Systems and methods for cryopreservation of cells
An auto-nucleating device includes a tube containing a crystalline cholesterol matrix. The ends of the tube are closed by a membrane that is impermeable to the cholesterol but permeable to liquids contained in a cryopreservation vessel. The auto-nucleating device provides a site for ice nucleation during freezing of the liquid within the vessel. One such cryopreservation vessel is a flexible vial having a closed port at one adapted to be pierced by a needle to withdraw the liquid within, and an opposite end that is initially open to receive the liquid. Another vessel includes an adaptor mounted to liquid container with a tubular branch closed by a needle septum and another tubular branch provided with a barbed fitting for engaging a flexible tube that terminates in a needle septum. In another embodiment, the vessel includes an inlet and vent branch at the top of the container and an outlet septum at a bottom opening.
1. A cryopreservation device comprising:
a container for receiving and storing a liquid sample, said container having an inlet fitting opening into said container;
an auto-nucleating device disposed within said container, said auto-nucleating device including;
an elongated hollow tube sized for introduction through said inlet fitting;
an ice-nucleating composition disposed within said hollow tube; and
a seal at both ends of said tube, at least one end sealed with a membrane that is impermeable to the ice-nucleating composition but permeable to the liquid contained within the cryopreservation vessel;
an adaptor mounted to said fitting, said adaptor having a first tubular branch and a second tubular branch, said second tubular branch terminating in a tube engaging fitting;
a septum closing said first tubular branch, said septum adapted to be pierced by a needle;
a tube engaged at one end to said tube engaging fitting on said second tubular branch; and
a closure at the opposite end of said tube.
2. The cryopreservation device of claim 1 , wherein said tube engaging fitting is a barbed fitting.
3. The cryopreservation device of claim 1 , wherein said closure is a septum adapted to be pierced by a needle.
4. The cryopreservation device of claim 1 , wherein said tube is a flexible tube having a length so that said opposite end of said tube is above said septum closing said first branch when said container is upright.
5. The cryopreservation device of claim 1 , wherein said closure is formed by heat sealing said opposite end of said tube.
6. The cryopreservation device of claim 1 , wherein said container is configured to be maintained at a pressure below atmospheric pressure.