Encapsulated cell device
First Claim
1. A transplantation or implantation device comprisinga hollow polysulfone fiber having ends and a fiber wall with a porosity which selectively allows nutritional, gaseous, and metabolic substances to pass therethrough and which only allows passage of substances having a molecular weight less than about 30,000 Daltons, anda mixture of viable, somatic, mammalian cells and alginate gel suspended within said fiber.
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Abstract
A macroencapsulation device for somatic cells using ultrapurified Na alginate and polysulfone hollow fibers of 30 kDa molecular weight cutoff. Ultrapurified Na alginate material is used which has a high `G` content, low endotoxin content, low divalent metal toxins and low protein impurities. Islet cells prior to being encapsulated, are irrigated with Hank'"'"'s modified solution (without Ca and Mg) containing gentamycin, vancomycin and amphotericin B and then passed through a leukoabsorb filter to reduce the donor antigen load of passenger leukocytes and to reduce the bioburden of microorganisms including viruses. Encapsulation is done in RPMI 1640 tissue culture fluid containing necessary nutritional supplements and ATP source of energy. The open ends of the fiber are covered with a porous membrane. To further improve biocompatibility, the outer wall of the polysulfone is lightly gelled with alginate gel. Such double gelled, encapsulated fibers do not affect diffusion of glucose or insulin across the hollow fibers.
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Citations
38 Claims
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1. A transplantation or implantation device comprising
a hollow polysulfone fiber having ends and a fiber wall with a porosity which selectively allows nutritional, gaseous, and metabolic substances to pass therethrough and which only allows passage of substances having a molecular weight less than about 30,000 Daltons, and a mixture of viable, somatic, mammalian cells and alginate gel suspended within said fiber.
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8. A transplantation or implantation device comprising
a hollow polysulfone fiber having ends and a fiber wall with a porosity which selectively allows nutritional, gaseous, and metabolic substances to pass therethrough and a mixture of viable, somatic, mammalian cells and alginate gel suspended within said fiber, wherein said alginate comprises ultrapurified alginate which is substantially free of divalent metal toxins and has (i) an endotoxin content of less than 750 EU/g, (ii) a protein content of less than 0.2%, and (iii) a G monomer, dimer and trimer content of greater than 60%.
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23. A transplantation or implantation device comprising
a biocompatible hollow fiber having ends and a fiber wall with a porosity which selectively allows nutritional, gaseous and metabolic substances to pass therethrough and which only allows passage of substances having a molecular weight less than about 30,000 Daltons; -
a mixture of viable, somatic, mammalian cells and a biocompatible viscous carrier disposed within said fiber and exposed at the ends thereof; and a biocompatible porous membrane cross-linked to the exposed mixture. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A transplantation of implantation device comprising
a biocompatible hollow fiber having ends and a fiber wall with a porosity which selectively allows nutritional, gaseous and metabolic substances to pass therethrough; -
a mixture of viable, somatic, mammalian cells and a biocompatible viscous carrier disposed within said fiber and exposed at the ends thereof, wherein said viscous carrier is ultrapurified alginate which is substantially free of divalent metal toxins and has (i) an endotoxin content of less than 750 EU/g, (ii) a protein content of less than 0.2%, and iii) a G monomer, dimer and trimer content of greater than 60%; and a biocompatible porous membrane cross-linked to the exposed mixture. - View Dependent Claims (34, 35, 36, 37, 38)
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Specification