Cell-filled hollow fiber membranes having modified cross-section
To provide a cell-filled device that is suitable for use in, for example, an implantable or circulation type hybrid artificial organ. In a cell-filled device including hollow fiber membranes whose hollow portions are filled with cells, the hollow fiber membranes have modified cross sections, and a cell aggregate provided in each of the hollow portions has cells formed into two or more layers in arbitrary directions, provided that the distance from an arbitrary point of the cell aggregate to the nearest inner wall of hollow fiber membrane is less than 75 μm. This cell-filled device enables effective use of cells without the necrosis thereof. Further, according to the present invention, there is provided a method of manufacturing the cell-filled device.
1. A cell-filled device, comprising:
hollow fiber membranes having inner walls which define hollow portions and modified cross-sections, said cross-sections having initial shapes of perfect circles and being modified by flat plate pressing or by roller pressing to form cross-sections of deformed perfect circles; and
a cell aggregate provided in each of the hollow portions, each cell aggregate having cells accumulated to form two or more layers in any radial direction, wherein,
a distance from any point of the cell aggregate to the inner wall cannot be 75 μm or more.
2. The cell-filled device according to claim 1 , wherein the distance to the nearest inner wall of the hollow fiber membrane is 50 μm or less.
3. The cell-filled device according to claim 1 , wherein the modified cross-section hollow fiber membrane is made of a synthetic polymer having a contact angle of 70 degrees or less such that the hollow fiber membrane consists of material having a contact angle of 70 degrees or less, and the cross-section of the hollow fiber membrane is modified such that the perfect circle cross-section is deformed to an oval shape.
4. The cell-filled device according to claim 1 , wherein a pore size of the hollow fiber membrane is 0.001 to 5 μm.
5. The cell-filled device according to claim 4 , wherein the pore size is 0.05 to 1 μm.
6. The cell-filled device according to claim 1 , wherein the hollow fiber membrane is made of a synthetic polymer having a contact angle of 70 degrees or less.
7. The cell-filled device according to claim 6 , wherein the synthetic polymer comprises a thermoplastic resin.
8. The cell-filled device according to claim 7 , wherein the thermoplastic resin comprises a polyethylene-based resin.
9. The cell-filled device according to claim 1 , wherein at least an inner surface of the hollow fiber membrane contains a hydrophilic polymer.
10. The cell-filled device according to claim 1 , wherein the cells comprise cells derived from an animal tissue.
11. The cell-filled device according to claim 10 , wherein the cells derived from an animal tissue comprise at least one kind of cell selected from the group consisting of cells derived from a liver, cells derived from a spleen, stem and precursor cells thereof, and genetic recombinant cells.
12. The cell-filled device according to claim 11 , wherein the cells derived from an animal tissue comprise hepatic cells.
13. The cell-filled device according to claim 10 , wherein the cells derived from an animal tissue comprise cells derived from a human organ.
14. A cell-filled device, comprising hollow fiber membranes and cells, provided as the cell-filled device for implantation according to claim 1 , wherein each of the hollow portions contains a cell aggregate and both ends of each hollow fiber membrane are sealed.
15. The cell-filled device according to claim 1 , wherein the modified cross section is a shape selected from the group consisting of a triangle, a rectangle, a parallelogram having diagonal axes of unequal length, an ellipse which is concave at the minor axis and convex at the major axis, a letter “C”, and a five-pointed star.
16. The cell-filled device according to claim 15 , wherein the triangle shape has concave sides.
17. The cell-filled device according to claim 15 , wherein the rectangle shape has concave sides.
18. A hybrid artificial organ, comprising:
at least one cell-filled device according to claim 1 ; and
a container having an inlet and an outlet for a liquid to be treated, said container housing said at least one cell-filled device,
wherein the hollow portions of the hollow fiber membranes of the cell-filled device provide a communication path from the inlet to the outlet for the liquid to be treated.