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A method used in connection with processing of blood components, wherein blood products are then filtered via a filter rotating along with a centrifuge rotor and the sensed pressure may be used in connection with controlling the pumping of the blood products and/or in connection with determining the

A method used in connection with processing of blood components, wherein blood products are then filtered via a filter rotating along with a centrifuge rotor and the sensed pressure may be used in connection with controlling the pumping of the blood products and/or in connection with determining the location of an interface associated with the blood products.

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What is claimed is: 1. A method of processing blood components, comprising: rotating a chamber about an axis of rotation, wherein blood components are centrifugally separated in the interior of the chamber pumping at least some of the centrifugally separated blood components from the chamber; filte

What is claimed is: 1. A method of processing blood components, comprising: rotating a chamber about an axis of rotation, wherein blood components are centrifugally separated in the interior of the chamber pumping at least some of the centrifugally separated blood components from the chamber; filtering the pumped blood components with a filter so as to filter at least some of at least one blood component from the pumped blood components, wherein the filter comprises a porous filtration membrane; sensing pressure of the blood components pumped to the filter; and controlling the pumping based on at least the sensed pressure. 2. The method of claim 1 wherein the pumping occurs during rotation of the chamber. 3. The method of claim 1 wherein a centrifuge is used to rotate the chamber, and wherein said at least some separated blood components are pumped from the chamber while the chamber is received on a rotor of the centrifuge. 4. The method of claim 3, further comprising causing at least one valving member on the centrifuge rotor to control flow of at least some of the blood components during rotation of the rotor. 5. The method of claim 4, wherein the valving member comprises a tubing clamp. 6. The method of claim 3, further comprising causing at least one sealing member on the centrifuge rotor to create a seal during rotation of the rotor. 7. The method of claim 6, wherein the sealing member comprises a tubing welder. 8. The method of claim 1 wherein a centrifuge is used to rotate the chamber, and wherein said at least some separated blood components are pumped from the chamber after the chamber is removed from a rotor of the centrifuge. 9. The method of claim 1, further comprising rotating the filter about an axis of rotation during the filtering. 10. The method of claim 9, wherein the filter comprises a filter housing defining an interior space containing the porous filtration medium, and wherein the method comprises flowing blood components in the interior space in a direction facing generally toward the axis of rotation. 11. The method of claim 1, wherein the chamber is configured so that an interior of the chamber has a variable volume, and wherein the pumping comprises reducing the volume of the interior of the chamber. 12. The method of claim 11, further comprising applying pressure to the chamber via hydraulic fluid. 13. The method of claim 1, further comprising calculating a difference between pressures sensed in at least one time interval, determining when the calculated difference is at least a predetermined amount, and controlling the pumping in response to at least the determination that the calculated difference is at least the predetermined amount. 14. The method of claim 1, further comprising optically sensing the pumped blood products, and controlling the pumping based on at least one of optically sensed information and sensed pressure. 15. The method of claim 14, wherein optically sensing comprises optically sensing blood components in the chamber. 16. The method of claim 14, wherein optically sensing comprises optically sensing blood components in a tubing line in flow communication with the filter. 17. The method of claim 14, wherein optically sensing comprises optically sensing blood components in the chamber and optically sensing blood components in a tubing line in flow communication with the filter. 18. The method of claim 1, wherein the method further comprises passing the filtered blood components into at least one collection container. 19. The method of claim 1, wherein the blood components in the chamber are blood components of a buffy coat. 20. The method of claim 1, wherein whole blood is processed in the method. 21. A method of processing blood components, comprising: rotating a chamber about an axis of rotation, wherein blood components are centrifugally separated in the chamber; pumping at least some of the centrifugally separated blood components from the chamber; sensing pressure of pumped blood components; calculating a difference between pressures sensed in at least one time interval; determining when the calculated difference is at least a predetermined amount; and controlling the pumping in response to at least the determination that the calculated difference is at least the predetermined amount. 22. The method of claim 21, wherein the pumping occurs during rotation of the chamber. 23. The method of claim 21, wherein the chamber is rotated via a centrifuge rotor, and wherein the method further comprises causing at least one valving member on the centrifuge rotor to control flow of at least some of the blood components during rotation of the rotor. 24. The method of claim 23, wherein the valving member comprises a tubing clamp. 25. The method of claim 21, wherein the chamber is rotated via a centrifuge rotor, and wherein the method further comprises causing at least one sealing member on the centrifuge rotor to create a seal during rotation of the rotor. 26. The method of claim 25, wherein the sealing member comprises a tubing welder. 27. The method of claim 21, further comprising filtering the pumped blood components with a filter so as to filter at least some of at least one blood component from the pumped blood components, wherein the filter comprises a porous filtration membrane. 28. The method of claim 27, wherein the rotating further comprises rotating the filter about the axis of rotation. 29. The method of claim 28, wherein the filter comprises a filter housing defining an interior space containing the porous filtration medium, and wherein the method comprises flowing blood components in the interior space in a direction facing generally toward the axis of rotation. 30. The method of claim 21, wherein the chamber is configured so that an interior of the chamber has a variable volume, and wherein the pumping comprises reducing the volume of the interior of the chamber. 31. The method of claim 30, further comprising applying pressure to the chamber via hydraulic fluid. 32. The method of claim 21, further comprising optically sensing the pumped blood products, and controlling the pump based on at least one of optically sensed information and sensed pressure. 33. The method of claim 32, wherein optically sensing comprises optically sensing blood components in the chamber. 34. The method of claim 32, wherein optically sensing comprises optically sensing blood components in a tubing line in flow communication with the filter. 35. The method of claim 32, wherein optically sensing comprises optically sensing blood components in the chamber and optically sensing blood components in a tubing line. 36. The method of claim 21, wherein the method further comprises passing at least some of the pumped blood components into at least one collection container. 37. The method of claim 21, wherein the blood components in the chamber are blood components of a buffy coat. 38. The method of claim 21, wherein whole blood is processed in the method. 39. A method of determining a location of at least one interface during processing of blood components, comprising: pumping at least some centrifugally separated blood components from a chamber; sensing pressure of the pumped blood components; and determining a location of at least one interface based on the sensed pressure, wherein the interface is associated with the pumped blood components. 40. The method of claim 39, wherein the interface comprises at least one of an interface between blood components and air, and an interface between differing blood components. 41. The method of claim 39, further comprising rotating a chamber about an axis of rotation, wherein blood components are centrifugally separated in the chamber. 42. The method of claim 41, wherein the pumping occurs during rotation of the chamber. 43. The method of claim 41, wherein the chamber is rotated via a centrifuge rotor, and wherein the method further comprises causing at least one valving member on the centrifuge rotor to control flow of at least some of the blood components during rotation of the rotor. 44. The method of claim 43, wherein the valving member comprises a tubing clamp. 45. The method of claim 41, wherein the chamber is rotated via a centrifuge rotor, and wherein the method further comprises causing at least one sealing member on the centrifuge rotor to create a seal during rotation of the rotor. 46. The method of claim 45, wherein the sealing member comprises a tubing welder. 47. The method of claim 41, further comprising filtering pumped blood components with a filter so as to filter at least some of at least one blood component from the pumped blood components, wherein the filter comprises a porous filtration membrane. 48. The method of claim 47, wherein the rotating further comprises rotating the filter about the axis of rotation. 49. The method of claim 48, wherein the filter comprises a filter housing defining an interior space containing the porous filtration medium, and wherein the method comprises flowing blood components in the interior space in a direction facing generally toward the axis of rotation. 50. The method of claim 39, further comprising filtering pumped blood components with a filter so as to filter at least some of at least one blood component from the pumped blood components, wherein the filter comprises a porous filtration membrane. 51. The method of claim 39, wherein the chamber is configured so that an interior of the chamber has a variable volume, and wherein the pumping comprises reducing the volume of the interior of the chamber. 52. The method of claim 51, further comprising applying pressure to the chamber via hydraulic fluid. 53. The method of claim 39, further comprising optically sensing the pumped blood products, and wherein the location of the location of the at least one interface is based on the sensed pressure and optically sensed information. 54. The method of claim 39, wherein the blood components in the chamber are blood components of a buffy coat. 55. The method of claim 39, wherein whole blood is processed in the method.