Systems and methods for processing complex biological materials

1. A method for processing biological material comprising:

providing a biological material comprising red blood cells and nucleated cells in a vessel;

adding an aggregating agent to the material in the vessel and allowing the material to separate into two or more distinct layers of submaterials, wherein one of the distinct layers of submaterials comprises a layer of red blood cells and another distinct layer comprises a sample mixture in which a target retentate is present;

extracting the layer of red blood cells from the vessel via a pick up line having a distal end located within the vessel at a level at which the layer of red blood cells settles during operation;

automatically transporting the sample mixture remaining in the vessel to a filtration device located downstream from the pickup line and separated from the vessel by a valve;

separating the sample mixture using the filtration device into the target retentate which is captured by the filtration device, a sample remainder which is directed to the vessel for recirculation, and a waste filtrate;

recirculating the sample remainder with the sample mixture in the vessel;

stopping circulation of the sample mixture and recirculation of the sample remainder once the predetermined concentration of nucleated cells within the vessel is reached; and

collecting a resulting target retentate from the filtration device into a target retentate receptacle.

2. The method of claim 1 , wherein the sample mixture is transported to the filtration device via a conduit.

3. The method of claim 1 , further comprising sensing the presence of one or more of the submaterials in the vessel.

4. The method of claim 1 , wherein one or more of the submaterials are extracted until a set point is reached.

5. The method of claim 1 , further comprising directing the waste filtrate into a waste filtrate receptacle.

6. The method of claim 5 , further comprising flushing the filtration device with the waste filtrate after the target retentate is collected in the target retentate receptacle.

7. The method of claim 1 , wherein the biological material comprises whole blood, cord blood or bone marrow.

8. The method of claim 7 , wherein the target retentate comprises nucleated cells.

9. The method of claim 8 , wherein the nucleated cells comprise stem cells.

10. The method of claim 1 , further comprising adding an aggregation enhancing agent to the material in the vessel.

11. The method of claim 10 , wherein the enhancing agent comprises citrate, succinate, a salt thereof, or a combination thereof.

12. The method of claim 1 , wherein the step of extracting the layer of red blood cells is automatically initiated.

13. The method of claim 12 , further comprising, after extraction of the red blood cells, automatically opening the valve to transport the sample mixture remaining in the vessel to the filtration device.

14. The method of claim 1 , further comprising selectively removing a determined amount of agent from an agent receptacle and introducing the determined amount of agent into the vessel.

15. The method of claim 14 , further comprising drawing a portion of material from the vessel after the agent has been introduced and returning the drawn material into the vessel to facilitate mixing of the material with the agent.