PLACENTAL TISSUE GRAFTS AND IMPROVED METHODS OF PREPARING AND USING THE SAME
First Claim
1. A tissue graft comprising a first membrane comprising an amnion and one or more additional membranes laminated to the first membrane, wherein the first membrane comprises an exposed basement membrane and stromal layer, and the one or more additional membranes are adjacent to the stromal layer.
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Accused Products
Abstract
Described herein are tissue grafts derived from the placenta. The grafts are composed of at least one layer of amnion tissue where the epithelium layer has been substantially removed in order to expose the basement layer to host cells. By removing the epithelium layer, cells from the host can more readily interact with the cell-adhesion bio-active factors located onto top and within of the basement membrane. Also described herein are methods for making and using the tissue grafts. The laminin structure of amnion tissue is nearly identical to that of native human tissue such as, for example, oral mucosa tissue. This includes high level of laminin-5, a cell adhesion bio-active factor show to bind gingival epithelia-cells, found throughout upper portions of the basement membrane.
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Citations
34 Claims
- 1. A tissue graft comprising a first membrane comprising an amnion and one or more additional membranes laminated to the first membrane, wherein the first membrane comprises an exposed basement membrane and stromal layer, and the one or more additional membranes are adjacent to the stromal layer.
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19. A method for preparing a tissue graft, comprising the steps:
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(a) obtaining a placenta from a subject, wherein the placenta comprises an amniotic membrane layer and a chorion tissue layer; (b) cleaning the placenta; (c) separating the chorion tissue layer from the amnion layer, wherein the amnion comprises epithelium cells adjacent to a basement membrane; (d) removing substantially all of the epithelium cells to expose the basement membrane of the amnion to produce a first membrane; (e) mounting the first membrane onto a surface of a drying fixture, wherein the basement membrane of the first membrane is adjacent to the surface of the drying fixture; (f) mounting one or more additional membranes on the first membrane to produce a layered tissue graft; and (g) dehydrating the layered tissue graft on the drying fixture. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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Specification