Reinforced placental tissue grafts and methods of making and using the same

Patent metadata

Field	Value
Publication number	US-12208180-B2
Application number	US-202017111957-A
Country	US
Kind code	B2
Filing date	Dec 4, 2020
Priority date	Aug 15, 2012
Publication date	Jan 28, 2025
Grant date	Jan 28, 2025

Abstract

Described herein are tissue grafts derived from the placental tissue that are reinforced with at least one biocompatible mesh. The tissue grafts possess good adhesion to biological tissues and are useful in wound healing applications. Also described herein are methods for making and using the tissue grafts.

First claim

What is claimed is:

1. A reinforced tissue graft comprising:
a first membrane comprising a placental tissue having a first side and a second side; wherein the first membrane consists of modified amnion; wherein said second side is an exposed fibroblast layer comprising fibroblast cells;
a biocompatible mesh having a plurality of pores and a first side and a second side, wherein the first side of the biocompatible mesh is adjacent to the second side of the first membrane; and
a second membrane comprising a placental tissue having a first side and a second side, wherein the first side of the second membrane is adjacent to the second side of the biocompatible mesh; wherein the biocompatible mesh has a pore size from 200 microns to 4,000 microns; wherein the first membrane and the second membrane are in contact with one another.

2. The tissue graft of claim 1 , wherein the first membrane comprises amnion, chorion, or a laminate comprising one or more layers of amnion with one or more layers of chorion.

3. The tissue graft of claim 1 , wherein the first side of the first membrane is an exposed basement membrane.

4. The tissue graft of claim 1 , wherein the second membrane comprises an amnion/chorion laminate, wherein the chorion is adjacent to the second side of the biocompatible mesh.

5. The tissue graft of claim 4 , wherein the amnion comprises an epithelium layer and a placental tissue intermediate layer, wherein the chorion is adjacent to the intermediate layer.

6. The tissue graft of claim 4 , wherein the amnion comprises a modified amnion comprising an exposed basement membrane and a placental tissue intermediate layer, wherein the chorion is adjacent to the intermediate layer.

7. The tissue graft of claim 4 , wherein the amnion comprises a modified amnion comprising an exposed basement membrane and an exposed fibroblast layer comprising fibroblast cells, wherein the chorion is adjacent to the exposed fibroblast layer.

8. The tissue graft of claim 1 , wherein the second membrane's placental tissue is Wharton's jelly.

9. The tissue graft of claim 1 , wherein at least one of said placental tissues is crosslinked.

10. The tissue graft of claim 1 , wherein the biocompatible mesh has a plurality of pores spaced from 1,000 microns to 4,500 microns apart as measured from the center of two pores.

11. The tissue graft of claim 1 , wherein the biocompatible mesh has a thickness of 300 microns to 2,000 microns.

12. The tissue graft of claim 1 , wherein the biocompatible mesh comprises a non-resorbable mesh made of a thermoplastic resin, polyethylene, ultra-high weight molecular weight polyethylene, high molecular weight polyolefin, uncoated monofilament polypropylene, polyether ether ketone, polyethylene terephthalate, polytetrafluoroethylene, expanded polytetrafluoroethylene, nylon, or any combination thereof.

13. The tissue graft of claim 1 , wherein the biocompatible mesh comprises a resorbable mesh made of polyglycolic acid, poly-L-lactic acid (PLLA), poly-D,L-lactic acid (PDLA), trimethylenecarbonate (TMC), poly-E-caprolactone, poly-P-dioxanone, a copolymer of lactide and glycolide (PLGA), polyhydroxy-3-butyrate, collagen, hyaluronic acid, silk, biocellulose, a polysaccharide, poly (DTE carbonate), a polyarylate, blends of PLLA, PLDA, or PLGA with TMC, or any combinations thereof.

14. The tissue graft of claim 1 , wherein the biocompatible mesh is structurally homologous.

15. The tissue graft of claim 14 , wherein the biocompatible mesh is wholly comprised of either amnion or chorion.

16. The tissue graft of claim 1 , wherein the biocompatible mesh is structurally heterologous.

17. The tissue graft of claim 16 , wherein the biocompatible mesh is comprised of amnion, chorion or combinations thereof.

18. A wound dressing comprising the tissue graft of claim 1 .

Assignees

• Mimedx Group Inc

Inventors

• Koob Thomas J
• Tofe Robert
• Chen Elizabeth

Classifications

• A61F13/01008

  characterised by the material · CPC title

• A61L27/3604

  characterised by the human or animal origin of the biological material, e.g. hair, fascia, fish scales, silk, shellac, pericardium, pleura, renal tissue, amniotic membrane, parenchymal tissue, fetal tissue, muscle tissue, fat tissue, enamel · CPC title

• A61L27/3633

  Extracellular matrix [ECM] · CPC title

• A61L27/24

  Collagen · CPC title

• A61F2/02

  Prostheses implantable into the body · CPC title