Multiple-layer immune barrier for donor cells
First Claim
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1. An implantable device comprising:
- a housing; and
a multi-layer immune barrier supported by the housing, wherein the multi-layer immune barrier comprises;
a membrane-alginate structure, the membrane-alginate structure being a selectively-permeable hydrophilized membrane having pores impregnated with a cross-linked alginate; and
a tissue-alginate layer positioned over the membrane-alginate structure, the tissue-alginate layer being a cross-linked alginate encapsulating a plurality of cells,wherein the housing comprises a cover, wherein the tissue-alginate layer is disposed within the housing, and the membrane-alginate structure is coupled to the cover.
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Abstract
A system is provided, including a plurality of donor cells and a first alginate structure that encapsulates the plurality of donor cells. The first alginate structure has a guluronic acid concentration of between 64% and 74%. The system additionally includes a second alginate structure that surrounds the first alginate structure, the second alginate structure having a mannuronic acid concentration of between 52% and 60%. A selectively-permeable membrane is coupled at least in part to the second alginate structure. Other embodiments are also described.
82 Citations
17 Claims
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1. An implantable device comprising:
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a housing; and a multi-layer immune barrier supported by the housing, wherein the multi-layer immune barrier comprises; a membrane-alginate structure, the membrane-alginate structure being a selectively-permeable hydrophilized membrane having pores impregnated with a cross-linked alginate; and a tissue-alginate layer positioned over the membrane-alginate structure, the tissue-alginate layer being a cross-linked alginate encapsulating a plurality of cells, wherein the housing comprises a cover, wherein the tissue-alginate layer is disposed within the housing, and the membrane-alginate structure is coupled to the cover. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An implantable device comprising:
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a housing; a multi-layer immune barrier supported by the housing, wherein the multi-layer immune barrier comprises; a membrane-alginate structure, the membrane-alginate structure being a selectively-permeable hydrophilized membrane having pores impregnated with a cross-linked High-M alginate; and a tissue-alginate layer positioned over the membrane-alginate structure, the tissue-alginate layer being an alginate encapsulating a plurality of pancreatic islet cells, wherein the alginate is a High-G alginate, wherein the housing comprises a cover, wherein the tissue-alginate layer is disposed within the housing, and the membrane-alginate structure is coupled to the cover; an oxygen reservoir for storing gaseous oxygen within the housing; one or more oxygen delivery tubes in fluid communication with the oxygen reservoir; and a plurality of fluid-injection ports disposed remotely from the housing, and coupled to the housing by respective oxygen delivery tubes, the fluid-injection ports comprising at least in part a penetrable surface for receiving a needle therethrough, and configured to receive gaseous oxygen from a source of gaseous oxygen, and to facilitate passage of gaseous oxygen to the plurality of pancreatic islet cells while the housing is disposed within a body of a subject.
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Specification