Biological fluid purification with biocompatible membranes

1. An apparatus for restoring or supplementing pancreatic function comprising:

a functional unit comprising:

a membrane comprising a first surface and a second surface;

a first channel system comprising a first luminal space, adhered to and in fluid communication with the first surface of the membrane, and comprising a first end configured to connect in fluid communication to a fluid supply and a second end configured to connect in fluid communication to a first fluid outlet;

a second channel system comprising a second luminal space, adhered to and in fluid communication with the second surface of the membrane, and comprising a third end configured to connect in fluid communication to a second fluid outlet;

wherein the first channel system and the second channel system are in fluid communication with each other across the membrane;

wherein each of the first and second channel systems comprise first and second channel system walls; and

wherein the second channel system has been populated with pancreatic islet cells, including beta cells, to generate functional, live pancreatic tissue adhered to the second channel system walls thereof.

2. The apparatus of claim 1 , wherein the membrane comprises a biocompatible extracellular matrix membrane separating the first channel system from the second channel system, the biocompatible extracellular matrix membrane is embedded into a matrix material.

3. The apparatus of claim 2 , wherein the biocompatible extracellular matrix membrane comprises a collagen membrane with a thickness of 0.1-10 micrometers (0.1-10 μm) that supports cell adhesion on both the first surface and the second surface of the collagen membrane.

4. The apparatus of claim 1 , wherein the membrane is configured to have a minimum shear stress of 5 dyne/cm 2 and/or a minimum transmembrane pressure of 10 mmHg.

5. The apparatus of claim 1 , wherein the functional unit comprises at least one biological fluid inflow conduit in fluid communication with the first end of the first channel system and the first luminal space and at least one biological fluid outflow conduit in fluid communication with the second end of the first channel system and the first luminal space, wherein the at least one biological fluid inflow conduit is in fluid communication with an arterial conduit, and the at least one biological fluid outflow conduit is in fluid communication with a vascular conduit.

6. The apparatus of claim 1 , wherein the first luminal space and the second luminal spaces are embedded in a scaffold.

7. The apparatus of claim 1 , wherein the first channel system comprises vascular channel walls lined with endothelial cells selected from induced pluripotent stem cell (iPSC) derived endothelial cells, and/or human umbilical cord endothelial cells.

8. The apparatus of claim 7 , wherein the endothelial cells and/or the pancreatic islet cells are allogenic or autologous to a patient using the apparatus.

9. The apparatus of claim 1 , wherein the apparatus comprises a plurality of functional units, including the functional unit and additional functional units of a same configuration, wherein each functional unit of the plurality of functional units has:

a first end of a first channel system and first luminal space in fluid communication with the at least one biological fluid inflow conduit;

a second end of a first channel system and first luminal space in fluid communication with the at least one biological fluid outflow conduit, and

a third end of a second channel system and second luminal space in fluid communication with a second outflow conduit;

wherein each first end of the plurality of functional units connects individually and in parallel to one of a plurality of manifold ports of the at least one biological fluid inflow conduit;

wherein each second end of the plurality of functional units connects individually and in parallel to one of a plurality of manifold ports of the at least one biological fluid outflow conduit; and

wherein each third end of the plurality of functional units connects individually and in parallel to one of a plurality of manifold ports of the second outflow conduit.

10. The apparatus of claim 9 , wherein the apparatus comprises the plurality of functional units, including the functional unit and the additional functional units of a same configuration, stacked in parallel layers of functional units.

11. The apparatus of claim 1 , wherein the apparatus is configured for extracorporeal operation in a sterile, heated enclosure.

12. The apparatus of claim 1 , wherein blood is delivered to the apparatus with a mechanical pump.

13. The apparatus of claim 1 , wherein the apparatus is disposed within a capsule, and sized and configured for placement within a human body to replace or augment a pancreas function.

14. The apparatus of claim 1 , wherein the membrane comprises a porous membrane that comprises pores disposed to interconnect the first surface and the second surface, wherein the pores have a diameter of pores have a diameter of between 1 μm and 15 μm.

15. A method of treating a patient having an insufficient pancreas function comprising fluidly connecting the apparatus of claim 1 to a circulation system of the patient and passing patient blood through the first channel system of the apparatus and back into the circulation system of the patient.

16. The method of claim 15 , wherein the apparatus is implanted in the patient.

17. The method of claim 15 , wherein the apparatus is extracorporeal to the patient.

18. A method of manufacturing the apparatus of claim 1 , comprising

providing a plurality of membranes having a sacrificial material in a form of a first channel system on a first surface and having sacrificial material in a form of a second channel system on a second surface;

submerging the plurality of membranes in a solution comprising a scaffold material;

gelating the scaffold material;

removing the sacrificial material to thereby form luminal spaces and walls of the first channel system and the second channel system; and

populating the second channel system with pancreatic islet cells, including beta cells.

19. The method of claim 18 , further comprising populating the first channel system of the membranes with endothelial cells.