Biomedical patches with aligned fibers

• US 10,617,512 B2
• Filed: 08/14/2019
• Issued: 04/14/2020
• Est. Priority Date: 06/17/2010
• Status: Active Grant

• Current Assignee: Washington University In St Louis
• Original Assignee: Washington University In St Louis
• Inventors: MacEwan, Matthew R., Xie, Jingwei, Ray, Zack, Xia, Younan
• Primary Examiner(s): Stewart, Alvin J
• Application Number:
  US16/540,548
• Publication Number:
  US 20190365520A1
• Time in Patent Office: 244 Days
• CPC Class Codes: A61F 2/0063 Implantable repair or support meshes, e.g. hernia meshes
• CPC Class Codes: A61F 2/02 Prostheses implantable into the body closure means for urethra or rectum or for artificial body openings therefor A61F2/0004
• CPC Class Codes: A61F 2/105 Skin implants, e.g. artificial skin
• CPC Class Codes: A61L 15/22 containing macromolecular materials
• CPC Class Codes: A61L 15/42 Use of materials characterised by their function or physical properties liquid bandages A61L26/00
• CPC Class Codes: A61L 27/14 Macromolecular materials
• CPC Class Codes: A61L 27/50 Materials characterised by their function or physical properties , e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
• CPC Class Codes: B29C 48/02 Small extruding apparatus, e.g. handheld, toy or laboratory extruders
• CPC Class Codes: B29C 48/05 Filamentary, e.g. strands
• CPC Class Codes: B29C 48/142 using force fields, e.g. gravity or electrical fields B29C48/9165 takes precedence
• CPC Class Codes: C12M 25/14 Scaffolds; Matrices in general C12N5/0068
• CPC Class Codes: D01D 5/0076 characterised by the collecting device, e.g. drum, wheel, endless belt, plate or grid D01D5/0046 takes precedence
• CPC Class Codes: D01D 5/0092 characterised by the electrical field, e.g. combined with a magnetic fields, using biased or alternating fields
• CPC Class Codes: D04H 1/728 by electro-spinning electro-spinning methods and apparatus D01D5/0007
• CPC Class Codes: D04H 3/016 characterised by the fineness
• CPC Class Codes: D04H 3/073 Hollow cylinder shaped

Abstract

A multi-laminar electrospun nanofiber scaffold for use in repairing a defect in a tissue substrate is provided. The scaffold includes a first layer formed by a first plurality of electrospun polymeric fibers, and a second layer formed by a second plurality of electrospun polymeric fibers. The second layer is combined with the first layer. A first portion of the scaffold includes a higher density of fibers than a second portion of the scaffold, and the first portion has a higher tensile strength than the second portion. The scaffold is configured to degrade via hydrolysis after at least one of a predetermined time or an environmental condition. The scaffold is configured to be applied to the tissue substrate containing the defect, and is sufficiently flexible to facilitate application of the scaffold to uneven surfaces of the tissue substrate, and to enable movement of the scaffold by the tissue substrate.

Claims

1. A multi-laminar electrospun nanofiber scaffold for use in repairing a defect in a tissue substrate, the multi-laminar electrospun nanofiber scaffold comprising:

a first layer formed by a first plurality of deposited electrospun polymeric fibers; and

a second layer formed by a second plurality of deposited electrospun polymeric fibers, wherein the second layer is combined with the first layer,

wherein at least a first portion of the multi-laminar electrospun nanofiber scaffold comprises a higher density of fibers than a second portion of the multi-laminar electrospun nanofiber scaffold, wherein the first portion comprises a higher tensile strength than the second portion,

wherein the multi-laminar electrospun nanofiber scaffold is configured to degrade via hydrolysis after at least one of a predetermined time or an environmental condition,

wherein the multi-laminar electrospun nanofiber scaffold is configured to be applied to the tissue substrate containing the defect,

wherein the multi-laminar electrospun nanofiber scaffold comprises varying density to be sufficiently flexible to facilitate application of the multi-laminar electrospun nanofiber scaffold to uneven surfaces of the tissue substrate, and

wherein the multi-laminar electrospun nanofiber scaffold comprises varying density to be sufficiently flexible to enable movement of the multi-laminar electrospun nanofiber scaffold by the tissue substrate.

2. The multi-laminar electrospun nanofiber scaffold of claim 1, wherein the first plurality of deposited electrospun polymeric fibers comprises polyglycolic acid.

3. The multi-laminar electrospun nanofiber scaffold of claim 1, wherein the second plurality of deposited electrospun polymeric fibers comprises caprolactone.

4. The multi-laminar electrospun nanofiber scaffold of claim 1, wherein at least one of the first plurality of deposited electrospun polymeric fibers and the second plurality of deposited electrospun polymeric fibers are radially aligned.

5. The multi-laminar electrospun nanofiber scaffold of claim 1, wherein at least one of the first plurality of deposited electrospun polymeric fibers and the second plurality of deposited electrospun polymeric fibers are non-radially aligned.

6. The multi-laminar electrospun nanofiber scaffold of claim 1, wherein at least one of the first plurality of deposited electrospun polymeric fibers and the second plurality of deposited electrospun polymeric fibers are randomly oriented.

7. The multi-laminar electrospun nanofiber scaffold of claim 1, wherein the first plurality of deposited electrospun polymeric fibers and the second plurality of deposited electrospun polymeric fibers are non-radially aligned.

8. A multi-laminar electrospun nanofiber scaffold for use in repairing a defect in a tissue substrate, the multi-laminar electrospun nanofiber scaffold comprising:

a first layer formed by a first plurality of deposited electrospun polymeric fibers; and

a second layer formed by a second plurality of deposited electrospun polymeric fibers, wherein the second layer is combined with the first layer,

wherein at least a first portion of the multi-laminar electrospun nanofiber scaffold comprises a higher density of fibers than a second portion of the multi-laminar electrospun nanofiber scaffold, wherein the first portion comprises a higher tensile strength than the second portion,

wherein the first layer and the second layer are configured to separate via hydrolysis after at least one of a predetermined time or an environmental condition,

wherein the multi-laminar electrospun nanofiber scaffold is configured to be applied to the tissue substrate containing the defect,

wherein the multi-laminar electrospun nanofiber scaffold comprises varying density to be sufficiently flexible to facilitate application of the multi-laminar electrospun nanofiber scaffold to uneven surfaces of the tissue substrate, and

wherein the multi-laminar electrospun nanofiber scaffold comprises varying density to be sufficiently flexible to enable movement of the multi-laminar electrospun nanofiber scaffold by the tissue substrate.

9. The multi-laminar electrospun nanofiber scaffold of claim 8, wherein the first plurality of deposited electrospun polymeric fibers comprises polyglycolic acid.

10. The multi-laminar electrospun nanofiber scaffold of claim 8, wherein the second plurality of deposited electrospun polymeric fibers comprises caprolactone.

11. The multi-laminar electrospun nanofiber scaffold of claim 8, wherein at least one of the first plurality of deposited electrospun polymeric fibers and the second plurality of deposited electrospun polymeric fibers are radially aligned.

12. The multi-laminar electrospun nanofiber scaffold of claim 8, wherein at least one of the first plurality of deposited electrospun polymeric fibers and the second plurality of deposited electrospun polymeric fibers are non-radially aligned.

13. The multi-laminar electrospun nanofiber scaffold of claim 8, wherein at least one of the first plurality of deposited electrospun polymeric fibers and the second plurality of deposited electrospun polymeric fibers are randomly oriented.

14. The multi-laminar electrospun nanofiber scaffold of claim 8, wherein the first plurality of deposited electrospun polymeric fibers and the second plurality of deposited electrospun polymeric fibers are non-radially aligned.

15. A three-dimensional electrospun nanofiber scaffold for use in repairing a defect in a tissue substrate, the three-dimensional electrospun nanofiber scaffold comprising:

a first layer formed by a first plurality of deposited electrospun polymeric fibers; and

a second layer formed by a second plurality of deposited electrospun polymeric fibers, wherein the second layer is combined with the first layer,

wherein at least a first portion of the three-dimensional electrospun nanofiber scaffold comprises a higher density of fibers than a second portion of the three-dimensional electrospun nanofiber scaffold,

wherein the first portion comprises a higher tensile strength than the second portion,

wherein the three-dimensional electrospun nanofiber scaffold is configured to degrade via hydrolysis after at least one of a predetermined time or an environmental condition,

wherein the three-dimensional electrospun nanofiber scaffold is configured to be applied to the tissue substrate containing the defect,

wherein the three-dimensional electrospun nanofiber scaffold comprises varying density to be sufficiently flexible to facilitate application of the three-dimensional electrospun nanofiber scaffold to uneven surfaces of the tissue substrate, and

wherein the three-dimensional electrospun nanofiber scaffold comprises varying density to be sufficiently flexible to enable movement of the three-dimensional electrospun nanofiber scaffold by the tissue substrate.

16. The three-dimensional electrospun nanofiber scaffold of claim 15, wherein the first plurality of deposited electrospun polymeric fibers comprises polyglycolic acid.

17. The three-dimensional electrospun nanofiber scaffold of claim 15, wherein at least one of the first plurality of deposited electrospun polymeric fibers and the second plurality of deposited electrospun polymeric fibers are radially aligned.

18. The three-dimensional electrospun nanofiber scaffold of claim 15, wherein at least one of the first plurality of deposited electrospun polymeric fibers and the second plurality of deposited electrospun polymeric fibers are non-radially aligned.

19. The three-dimensional electrospun nanofiber scaffold of claim 15, wherein at least one of the first plurality of deposited electrospun polymeric fibers and the second plurality of deposited electrospun polymeric fibers are randomly oriented.

20. The three-dimensional electrospun nanofiber scaffold of claim 15, wherein the first plurality of deposited electrospun polymeric fibers and the second plurality of deposited electrospun polymeric fibers are non-radially aligned.