Apparatus and method for bioprocessing
A bioreactor vessel incudes a first compartment configured to receive a suspension comprising cells and a cell culture medium, for use in a cell processing operation, a second compartment for receiving an overflow of the cell culture medium from the first compartment, and an overflow separating the first compartment from the second compartment, the overflow being configured to maintain a level of the cell culture medium in the first compartment.
1. A bioreactor vessel, comprising:
a bottom;
a top;
a plurality of sidewalls connecting the bottom with the top to define an interior chamber therein;
a first compartment, disposed in the interior chamber, configured to receive a suspension comprising cells and a cell culture medium, for use in a cell processing operation, wherein the first compartment abuts each of the plurality of sidewalls;
a second compartment, disposed in the interior chamber about the first compartment, for receiving an overflow of used cell culture medium from the first compartment, wherein the second compartment is surrounded entirely by the first compartment and spaced apart from the plurality of sidewalls;
an inlet in fluid communication with the interior chamber to receive fresh cell culture medium that is supplied to the first compartment;
an overflow separating the first compartment and the second compartment, the overflow configured to allow for passage of the used cell culture medium from the first compartment to the second compartment when the level of cell culture medium within the first compartment exceeds a height of the overflow to maintain a level of the cell culture medium in the first compartment at a height equal to or less than the height of the overflow, the amount of used cell culture medium passing over the overflow from the first compartment into the second compartment corresponds to the amount of fresh cell culture medium supplied to the first compartment from the inlet, wherein a volume of fresh cell culture medium added to the first compartment at a predetermined rate causes an equivalent volume of used cell culture medium to pass over the overflow into the second compartment at the same predetermined rate, maintaining a constant volume of cell culture medium in the first compartment; and
an outlet associated with the second compartment and configured to receive the used cell culture medium passing over the overflow for passage out of the bioreactor vessel;
wherein the height of the overflow is selectively adjustable to allow for adjustment of a depth of the suspension within the first compartment.
2. The bioreactor vessel of claim 1 , wherein:
the inlet is located in one of the plurality of sidewalls adjacent to the bottom.
3. The bioreactor vessel of claim 1 , wherein:
the overflow has a height that is less than a depth of the bioreactor vessel.
4. The bioreactor vessel of claim 1 , wherein:
a maximum volume of the suspension within the bioreactor vessel is defined by the height of the overflow.
5. The bioreactor vessel of claim 1 , wherein:
the second compartment is generally conical or funnel-shaped.
6. The bioreactor vessel of claim 1 , wherein:
the inlet is located in the bottom of the bioreactor vessel.
7. The bioreactor vessel of claim 1 , further comprising:
a cell-retaining membrane enclosing at least a portion of the first compartment, the cell-retaining membrane allowing for overflow of the used cell culture medium from the first compartment to the second compartment while retaining the cells in the first compartment.
8. The bioreactor vessel of claim 1 , wherein:
the overflow comprises a weir configured to allow the used cell culture medium to overflow the top thereof into the second compartment.
9. The bioreactor vessel of claim 1 , wherein:
the overflow includes a plurality of vertically-spaced outlets, each outlet having a control valve associated therewith for selectively preventing or allowing a flow of the cell culture medium out of said outlet.
10. A bioreactor vessel, comprising:
a bottom;
a top;
a plurality of sidewalls connecting the bottom with the top to define an interior chamber therein;
a first compartment, disposed in the interior chamber, configured to receive a suspension comprising cells and a cell culture medium, for use in a cell processing operation;
a second compartment, disposed in the interior chamber about the first compartment, for receiving an overflow of used cell culture medium from the first compartment;
an overflow separating the first compartment and the second compartment, the overflow being configured to allow for passage of the used cell culture medium from the first compartment to the second compartment when the level of cell culture medium within the first compartment exceeds a height of the overflow to maintain a level of the cell culture medium in the first compartment at a height equal to or less than the height of the overflow; and
an outlet associated with the second compartment and configured to receive the cell culture medium passing over the overflow and to allow for passage of the cell culture medium passing over the overflow out of the bioreactor vessel;
wherein the overflow includes a plurality of vertically-spaced outlets extending between the top and the bottom, each outlet having a control valve associated therewith for selectively preventing or allowing a flow of the cell culture medium out of said outlet.
11. The bioreactor vessel of claim 8 , wherein the overflow is configured for extendable and retractable movement within the interior chamber in relation to the bottom.
12. The bioreactor vessel of claim 1 , wherein the outlet is located in one of the bottom, the top, and a sidewall of the plurality of sidewalls.
13. The bioreactor vessel of claim 10 , wherein each of the vertically-spaced outlets and corresponding control valves is operated as a function of cell culturing in the first compartment.
14. The bioreactor vessel of claim 13 , wherein at an initial stage of cell culturing a vertical outlet and corresponding control valve that is closest to the bottom is opened and in fluid communication with the outlet associated with the second compartment while the other vertical outlets and corresponding controls valves vertically above are closed.
15. The bioreactor vessel of claim 14 , wherein at a subsequent stage of cell culturing during which cell population increases, the vertical outlet and corresponding control valve immediately above the previously opened vertical outlet and corresponding control valve is opened and in fluid communication with the outlet while the other vertical outlets and corresponding controls valves are closed.
16. The bioreactor vessel of claim 15 , wherein the vertical outlets and corresponding control valves closer towards the top are opened as the cell population in the first compartment increases.