Method and apparatus for cryopreservation of blood cells in a sterile environment
An apparatus and related method for the optimization of the cryopreservation of various types of cells, including but not limited to hematopoietic and mesenchymal stem and progenitor cells, and endothelial progenitor cells found in normal blood, placental/cord blood, bone marrow or the stromal vascular fraction of adipose tissue. The apparatus for cryopreservation of biological materials in a sterile environment comprises a cryopreservation workstation, a rigid disposable cartridge, and a freezing bag assembly. The apparatus and related method provide for the precise, temperature controlled, homogenously distributed introduction of a cryoprotectant containing dimethyl sulfoxide (DMSO) into a solution containing nucleated cells in a manner that provides a safe increase in osmotic pressure and a controlled release of exothermic heat within the cells as the DMSO penetrates the cell membrane and replaces water molecules prior to the freezing of the cells.
1. A cryopreservation workstation for providing cryopreservation of biological materials in a sterile environment comprising:
an upper platform;
an upper mixing chamber holder;
a freezing bag holder;
a mixing module with a mixing chamber compartment comprising a mixing module cap, a cooling plate, a mixing module door, an infrared sensor to record the temperature of fluid contents within any fluid container placed within the mixing chamber compartment and a mechanism for nutating motion;
a freezing bag air expresser to expel air from a three dimensional freezing bag, the freezing bag air expresser having a pair of parallel walls and a handle, and the freezing bag comprising multiple compartments not in fluid connection with one another;
a cryoprotectant mixing chamber holder connected to the freezing bag air expresser;
whereby the cryopreservation workstation provides mixing of contents of harvested cell solution and a cryoprotectant solution without the formation of standing waves, passage of cryoprotected cell solution under sterile conditions and monitoring, regulating and recording temperature of the cryoprotected cell solution.
2. The cryopreservation workstation of claim 1 wherein the upper platform includes at least one locking means that is configured to hold a rigid disposable cartridge filled with a harvested cell solution.
3. The cryopreservation workstation of claim 2 wherein the upper platform is tilted to provide a rocking motion of the rigid disposable cartridge thereby ensuring all cells resident in the harvested cell solution within the rigid disposable cartridge are contained in the harvested cell solution and not adhered to a compartment wall thereof.
4. The cryopreservation workstation of claim 1 wherein the mixing module door on a top portion of the mixing module is adaptable to seal a cryoprotectant mixing chamber inside the mixing chamber compartment of the mixing module.
5. The cryopreservation workstation of claim 4 wherein the cryoprotectant mixing chamber when placed within the mixing chamber compartment comes into contact with the cooling plate of the mixing module such that temperature of the harvested cell solution within the cryoprotectant mixing chamber is regulated by conduction due to direct heat transfer.
6. The cryopreservation workstation of claim 1 wherein the said multiple compartments of said freezing bag are severable along an indent line.
7. The cryopreservation workstation of claim 1 wherein the freezing bag comprises at least three compartments.
8. The cryopreservation workstation of claim 1 wherein the cryoprotectant solution is a dimethyl sulfoxide (DMSO) solution.