Implantation of encapsulated biological materials for treating diseases
First Claim
1. A composition comprising:
- encapsulating devices comprising a conformal coating, andcell aggregates,wherein said composition has a cell density of at least about 100,000 cells/ml, wherein the conformal coating for the encapsulating devices comprises a polymerizable high density ethylenically unsaturated PEG having a molecular weight between 900 and 3,000 Daltons, and a sulfonated comonomer, and wherein the coating conforms to the size and shape of the cell aggregates.
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Abstract
The present invention relates to compositions and methods of treating a disease, such as diabetes, by implanting encapsulated biological material into a patient in need of treatment. This invention provides for the placement of biocompatible coating materials around biological materials using photopolymerization while maintaining the pre-encapsulation status of the biological materials. Several methods are presented to accomplish coating several different types of biological materials. The coatings can be placed directly onto the surface of the biological materials or onto the surface of other coating materials that hold the biological materials. The components of the polymerization reactions that produce the coatings can include natural and synthetic polymers, macromers, accelerants, cocatalysts, photoinitiators, and radiation. This invention also provides methods of utilizing these encapsulated biological materials to treat different human and animal diseases or disorders by implanting them into several areas in the body including the subcutaneous site. The coating materials can be manipulated to provide different degrees of biocompatibility, protein diffusivity characteristics, strength, and biodegradability to optimize the delivery of biological materials from the encapsulated implant to the host recipient while protecting the encapsulated biological materials from destruction by the host inflammatory and immune protective mechanisms without requiring long-term anti-inflammatory or anti-immune treatment of the host.
104 Citations
36 Claims
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1. A composition comprising:
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encapsulating devices comprising a conformal coating, and cell aggregates, wherein said composition has a cell density of at least about 100,000 cells/ml, wherein the conformal coating for the encapsulating devices comprises a polymerizable high density ethylenically unsaturated PEG having a molecular weight between 900 and 3,000 Daltons, and a sulfonated comonomer, and wherein the coating conforms to the size and shape of the cell aggregates. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 17, 18, 19, 20, 21, 22, 23, 24)
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9. A composition comprising a plurality of encapsulating devices having an average diameter of less than 400 μ
- m, said encapsulating devices comprising encapsulated cells aggregates conformally coated in an encapsulation material, wherein the composition comprises at least about 500,000 cells/ml and wherein the encapsulation material comprises a polymerizable high density ethylenically unsaturated PEG having a molecular weight of between 900 and 3,000 Daltons, and a sulfonated comonomer, wherein the coating conforms to the size and shape of the cell aggregates.
- View Dependent Claims (10, 11, 12, 13)
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14. A composition comprising a plurality of encapsulating devices having an average diameter of less than 400 μ
- m, said encapsulating devices comprising encapsulated cells aggregates conformally coated in an encapsulation material, wherein the composition comprises a ratio of volume of encapsulating device to volume of cells of less than about 20;
1 and wherein the encapsulation material comprises a polymerizable high density ethylenically unsaturated PEG having a molecular weight between 900 and 3,000 Daltons, and a sulfonated comonomer, and wherein the encapsulation material conforms to the size and shape of the cell aggregates. - View Dependent Claims (15, 16)
- m, said encapsulating devices comprising encapsulated cells aggregates conformally coated in an encapsulation material, wherein the composition comprises a ratio of volume of encapsulating device to volume of cells of less than about 20;
- 25. A composition comprising encapsulating devices comprising encapsulating cells in an encapsulation material with a polyethylene glycol (PEG) coating having a molecular weight between 900 and 3,000 Daltons, wherein said composition has a cell density of at least about 6,000,000 cells/ml.
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32. A composition comprising a plurality of encapsulating devices having an average diameter of less than 400 μ
- m, said encapsulating devices comprising encapsulated cells in an encapsulation material, wherein a cell density is at least about 6,000,000 cells/ml.
- View Dependent Claims (33, 34, 35, 36)
Specification