Bioreactor systems and disposable bioreactor

1. A bioreactor, comprising:

a container for holding a fluid culture;

a first unidirectional valve connected to an outlet of the container;

a second unidirectional valve connected to an inlet of the container;

a connector having a first lead connected to the first unidirectional valve, a second lead connected to the second unidirectional valve and a third lead;

a filter having a first end connected to the third lead of the connector; and

a diaphragm pump connected to a second end of the filter and in fluid communication with the first and second valves, wherein the first unidirectional valve allows fluid culture flow away from the container and toward the diaphragm pump and the second unidirectional valve allows fluid culture flow toward the container and away from the diaphragm pump.

2. The bioreactor of claim 1 , wherein the container comprises a disposable container for holding a fluid culture, the container including a diffuser completely disposed within the fluid culture when held within the disposable container, an outlet tube for drawing the culture from a bottom of the container, and an inlet tube for returning at least a portion the culture from the outlet tube to the container through the diffuser, wherein the diffuser disperses the returning culture to the disposable container into a wider more distributed stream than would occur using the inlet tube without the diffuser.

3. The bioreactor of claim 2 , wherein the diffuser combines a gas from a source external to the container with the returning culture before the dispersion to the container.

4. The bioreactor of claim 2 , wherein the first diffuser and at least one of the tubes comprise a thermoplastic or silicon.

5. The bioreactor of claim 2 , wherein the container tapers to a narrow lower portion and the outlet tube is disposed in the narrow lower portion.

6. The bioreactor of claim 2 , wherein the first diffuser comprises a screen mesh.

7. The bioreactor of claim 2 , wherein the first diffuser comprises a hollow body having a top surface, wherein the hollow body defines a plurality of apertures extending through the top surface.

8. The bioreactor of claim 2 , further comprising a second diffuser disposed below the first diffuser.

9. The bioreactor of claim 8 , wherein the second diffuser is a gas diffuser, whereby bubbles from the second diffuser will bubble up around the first diffuser.

10. The bioreactor of claim 1 , wherein the first unidirectional valve and the second unidirectional valve are coupled to at least one of the diaphragm pump and the container by tubing.

11. The bioreactor of claim 10 , wherein the tubing comprises a weldable thermoplastic elastomer or silicone.

12. The bioreactor of claim 1 , wherein at least one of the first unidirectional valve and the second unidirectional valve are at least one of a pinch valve and a check valve.

13. The bioreactor of claim 1 , further comprising:

a filter housing having an open first end and an open second end, the open second end being formed as the liquid-containing side of a diaphragm pump; and,

a filter element disposed in the filter housing.

14. The bioreactor of claim 13 , wherein the filter element comprises hollow fibers.

15. The bioreactor of claim 13 wherein the open second end is formed in an approximately semi-hemispherical shape.

16. The bioreactor of claim 1 , further comprising at least one pH sensor, dissolved oxygen sensor and a glucose sensor.

17. A filtration system, comprising:

A) a bioreactor, comprising:

a container for holding a fluid culture;

a filter for filtering the fluid culture; and

B) a bioreactor valve system disposed between the container and the filter, the bioreactor valve system comprising:

a first unidirectional valve coupled to an outlet of the container;

a second unidirectional valve coupled to an inlet of the container;

a connector having a first lead connected to the first unidirectional valve, a second lead connected to the second unidirectional valve and a third lead connected to a first end of the filter; and

a diaphragm pump connected to a second end of the filter,

wherein the first unidirectional valve allows liquid flow away from the bioreactor and toward the diaphragm pump and the second unidirectional valve allows liquid flow toward the bioreactor and away from the diaphragm pump.

18. The filtration system of claim 17 , wherein the bioreactor further includes a diffuser disposed completely within the fluid culture held in the container;

an outlet tube for drawing the culture from a bottom of the container;

an inlet tube for returning at least a portion the culture from the outlet tube to the container through the diffuser, the diffuser being disposed above the container bottom and adapted to lie within the culture, wherein the diffuser disperses the returning culture to the disposable container into a wider more distributed stream than would occur using the inlet tube without the diffuser, wherein the diffuser combines a gas from a source external to the container with the returning culture before the dispersion to the container.

19. The filtration system of claim 18 , wherein at least a portion of the first diffuser is formed from a buoyant material.

20. A bioreactor, comprising:

a container for holding a fluid culture;

a single integrated valve unit including a first unidirectional valve connected to an outlet of the container and a second unidirectional valve connected to an inlet of the container;

a filter having a first end coupled to the single integrated valve unit; and

a diaphragm pump connected to a second end of the filter and in fluid communication with the single integrated valve unit, wherein the first unidirectional valve allows fluid culture flow away from the container and toward the diaphragm pump and the second unidirectional valve allows fluid culture flow toward the container and away from the diaphragm pump.

21. The bioreactor of claim 20 , wherein the single integrated valve unit comprises a single housing having a first barb fitting connected via tubing to the outlet of the container and a second barb fitting connected via tubing to the inlet of the container, the housing being coupled to the first end of the filter.