Multi-layer tissue patches
First Claim
1. A method of manufacturing a multi-layer amnion tissue patch, the method comprising:
- obtaining a first amnion tissue layer having an epithelial layer, a basement membrane, a compact layer, and a fibroblast layer from which a spongy layer has been removed, the fibroblast layer including a loose network of reticulum, wherein the first tissue layer is treated with a glutaraldehyde exposure process;
obtaining a second amnion tissue layer having an epithelial layer, a basement membrane, a compact layer, and a fibroblast layer from which a spongy layer has been removed, the fibroblast layer including a loose network of reticulum, wherein the second tissue layer is not treated with a glutaraldehyde exposure process;
compressing the treated first amnion tissue layer with the untreated second amnion tissue layer so as to form the patch, such that the epithelial layers of the first and second amnion tissue layers define first and second opposing outer surfaces of the patch, respectively, wherein a compressed, coupled fibroblast region is disposed between at least a portion of the first and second opposing outer surfaces of the patch, and wherein the compressed, coupled fibroblast region comprises fibers of at least a portion of the first fibroblast layer entangled with fibers of at least a portion of the second fibroblast layer.
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Abstract
Embodiments of the present invention encompass anti-adhesion wound dressings including patches made from amnion tissue obtained from human birth tissue. Exemplary amnion patches can be fabricated by folding a section of amnion over on itself with the epithelial layer on the outside of the folded patch and the fibroblast layer on the inside of the folded patch. Optionally, individual amnion tissue pieces can be sandwiched together to provide a multi-layer patch. Sufficient pressure is applied to the layered amnion to cause adherence between opposing faces of the fibroblast layers. The pressed fibroblast layers provide mechanical strength to hold the amnion patch together with the epithelial layers on the outsides of the amnion patch.
148 Citations
17 Claims
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1. A method of manufacturing a multi-layer amnion tissue patch, the method comprising:
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obtaining a first amnion tissue layer having an epithelial layer, a basement membrane, a compact layer, and a fibroblast layer from which a spongy layer has been removed, the fibroblast layer including a loose network of reticulum, wherein the first tissue layer is treated with a glutaraldehyde exposure process; obtaining a second amnion tissue layer having an epithelial layer, a basement membrane, a compact layer, and a fibroblast layer from which a spongy layer has been removed, the fibroblast layer including a loose network of reticulum, wherein the second tissue layer is not treated with a glutaraldehyde exposure process; compressing the treated first amnion tissue layer with the untreated second amnion tissue layer so as to form the patch, such that the epithelial layers of the first and second amnion tissue layers define first and second opposing outer surfaces of the patch, respectively, wherein a compressed, coupled fibroblast region is disposed between at least a portion of the first and second opposing outer surfaces of the patch, and wherein the compressed, coupled fibroblast region comprises fibers of at least a portion of the first fibroblast layer entangled with fibers of at least a portion of the second fibroblast layer. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A multi-layer amnion tissue patch, comprising:
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a first amnion tissue layer having an epithelial layer, a basement membrane, a compact layer, and a fibroblast layer from which a spongy layer has been removed, the fibroblast layer including a loose network of reticulum; and a second amnion tissue layer having an epithelial layer, a basement membrane, a compact layer, and a fibroblast layer from which a spongy layer has been removed, the fibroblast layer including a loose network of reticulum; wherein the epithelial layers of the first and second tissue layers define first and second opposing outer surfaces of the patch, respectively; wherein a compressed, coupled fibroblast region is disposed between at least a portion of the first and second opposing outer surfaces of the patch, the compressed, coupled fibroblast region comprising fibers of at least a portion of the first fibroblast layer entangled with fibers of at least a portion of the second fibroblast layer; and wherein the first amnion tissue layer is treated with a glutaraldehyde protocol and the second amnion tissue layer is not treated with a glutaraldehyde protocol. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification