IP Library › Granted Patent US 12,208,180
Granted Patent B2
US 12,208,180 · App. 17/111,957 · Granted Jan 28, 2025

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

Inventors: Thomas J. Koob (Marietta, GA); Robert Tofe (Denver, CO); Elizabeth Chen (Denver, CO)
Assignee: MiMedx Group, Inc.
A61L27/54A61F2/0063A61F2/02A61L27/14A61L27/24A61L27/36A61L27/3604A61L27/44A61L27/56A61F13/01008A61L27/3633
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Quick Facts
Patent No.
US 12,208,180
App. No.
17/111,957
Granted
Jan 28, 2025
Kind
B2
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.

Claims (21)

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 .

Assignments (6)
SECURITY INTEREST Recorded Jan 25, 2024
From: MIMEDX GROUP, INC.
To: CITIZENS BANK, N.A.
Reel/Frame 066371/0136 →
CORRECTIVE ASSIGNMENT TO CORRECT THE ADD ASSIGNEE PREVIOUSLY RECORDED ON REEL 054561 FRAME 0296. ASSIGNOR(S) HEREBY CONFIRMS THE TO ADD ASSIGNEE THAT WAS MISTAKENLY OMITTED FROM INITIAL RECORDING OF ASSIGNMENT. Recorded Jan 8, 2021
From: TOFE, ROBERT; CHEN, ELIZABETH
To: SNOASIS MEDICAL, INC.
Reel/Frame 054927/0890 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Dec 7, 2020
From: KOOB, THOMAS J.
To: MIMEDX GROUP, INC.
Reel/Frame 054561/0275 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Dec 7, 2020
From: SURGICAL BIOLOGICS, LLC
To: MIMEDX GROUP, INC.
Reel/Frame 054561/0281 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Dec 7, 2020
From: TOFE, ROBERT
To: SNOASIS MEDICAL, INC.
Reel/Frame 054561/0296 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Dec 7, 2020
From: SNOASIS MEDICAL, INC.
To: SURGICAL BIOLOGICS, LLC
Reel/Frame 054561/0312 →
Continuity (4)
Continuation 13967326 · Aug 14, 2013
Provisional Application 61808171 · Apr 3, 2013
Provisional Application 61683699 · Aug 15, 2012
Related Publication 20210146011A1 · May 20, 2021
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