Filter device

1. A biological fluid processing device comprising:

(a) a housing comprising an inlet portion including an inlet portion inlet port, and a separate inlet portion elution fluid outlet port, an outlet portion including an outlet portion outlet port and an outlet portion elution fluid inlet port, and defining a first fluid flow path between the inlet portion inlet port and the outlet portion outlet port and a second fluid flow path between the outlet portion elution fluid inlet port and the inlet portion elution fluid outlet port;

(b) a porous fibrous leukocyte depletion filter having a first surface and a second surface, disposed in the housing across the first fluid flow path and across the second fluid path; and

(c) a first perforated diffusing plate having a first surface and a second surface and asymmetrically shaped perforations through the first perforated diffusing plate, the asymmetrically shaped perforations having larger internal diameters at the second surface of the first perforated diffusing plate than at the first surface of the first perforated diffusing plate, the first perforated diffusing plate being disposed in the housing across the first fluid flow path and across the second fluid path, wherein the first perforated diffusing plate is disposed in the housing between the second surface of the porous fibrous leukocyte depletion filter and the outlet portion outlet port and the outlet portion elution fluid inlet port, the first surface of the first diffusing plate facing the second surface of the porous fibrous leukocyte filter.

2. The device of claim 1 , wherein the first perforated diffusing plate comprises perforations arranged in a pattern of two or more generally concentric circles.

3. The device of claim 1 , wherein the first perforated diffusing plate comprises perforations arranged in a non-concentric pattern.

4. The device of claim 1 , wherein the first surface of the first perforated diffusing plate includes upwardly protruding ridges.

5. The device of claim 4 , wherein the first surface of the first perforated diffusing plate includes a plurality of upwardly protruding concentric ridges.

6. The device of claim 5 , wherein the ridges are non-continuous, and alternating rows of ridges are interrupted by perforations.

7. The device of claim 1 , further comprising a second perforated diffusing plate having a first surface and a second surface, disposed in the housing across the first fluid flow path and across the second fluid path, wherein the second perforated diffusing plate is disposed in the housing between the first surface of the porous fibrous leukocyte depletion filter and the inlet portion inlet port and the inlet portion elution fluid outlet port.

8. The device of claim 2 , wherein the first perforated diffusing plate comprises perforations arranged in a non-concentric pattern.

9. The device of claim 2 , wherein the first surface of the first perforated diffusing plate includes upwardly protruding ridges.

10. The device of claim 3 , wherein the first surface of the first perforated diffusing plate includes upwardly protruding ridges.

11. The device of claim 8 , wherein the first surface of the first perforated diffusing plate includes upwardly protruding ridges.

12. The device of claim 9 , wherein the first surface of the first perforated diffusing plate includes a plurality of upwardly protruding concentric ridges.

13. A method for obtaining one or more biological fluid components, comprising:

(a) passing a biological fluid through the biological fluid processing device of claim 1 , wherein the fluid passes from the inlet portion inlet port of the device through the outlet portion outlet port of the device, wherein one or more desired biological fluid components are retained by the filter as the fluid passes along the first fluid flow path from the inlet portion inlet port through the outlet portion outlet port;

(b) passing an elution fluid from the outlet portion elution fluid inlet port through the first perforated diffusing plate, the porous fibrous leukocyte depletion filter, and the inlet portion elution fluid outlet port, wherein the elution fluid elutes one or more biological fluid components from the filter; and,

(c) obtaining one or more eluted biological fluid components.

14. The method of claim 13 , comprising obtaining eluted leukocytes and/or stem cells.

15. A method for obtaining one or more biological fluid components, comprising:

(a) passing a biological fluid through the biological fluid processing device of claim 7 , wherein the fluid passes from the inlet portion inlet port of the device through the outlet portion outlet port of the device, wherein one or more desired biological fluid components are retained by the filter as the fluid passes along the first fluid flow path from the inlet portion inlet port through the outlet portion outlet port;

(b) passing an elution fluid from the outlet portion elution fluid inlet port through the first perforated diffusing plate, the porous fibrous leukocyte depletion filter, the second perforated diffusing plate, and the inlet portion elution fluid outlet port, wherein the elution fluid elutes one or more biological fluid components from the filter; and,

(c) obtaining one or more eluted biological fluid components.