Multilayer Scaffold

• US 20110287082A1
• Filed: 01/21/2009
• Published: 11/24/2011
• Est. Priority Date: 01/25/2008
• Status: Abandoned Application

• Current Assignee: Smith & Nephew PLC
• Original Assignee: Smith & Nephew PLC
• Inventors: Smith, Jennifer Margaret, Raxworthy, Michael John, Iddon, Peter Damien
• Application Number:
  US12/864,012
• Publication Number:
  US 20110287082A1
• Time in Patent Office: Days
• US Class Current: 424/444
• CPC Class Codes: A61F 2/105 Skin implants, e.g. artificial skin
• CPC Class Codes: A61L 2430/34 for soft tissue reconstruction
• CPC Class Codes: A61L 27/18 obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
• CPC Class Codes: A61L 27/3813 Epithelial cells, e.g. keratinocytes, urothelial cells
• CPC Class Codes: A61L 27/56 Porous materials, e.g. foams or sponges
• CPC Class Codes: A61L 27/58 Materials at least partially resorbable by the body
• CPC Class Codes: A61L 27/60 Materials for use in artificial skin
• CPC Class Codes: A61P 17/02 for treating wounds, ulcers, burns, scars, keloids, or the like
• CPC Class Codes: D01F 6/625 derived from hydroxy-carboxylic acids, e.g. lactones
• CPC Class Codes: D10B 2401/10 porous
• CPC Class Codes: D10B 2401/12 biodegradable
• CPC Class Codes: D10B 2509/00 Medical; Hygiene

Abstract

The invention generally relates to biodegradable and/or bioresorbable fibrous articles and more particularly to products and methods having utility in medical applications.

Claims

1. A bioresorbable, synthetic scaffold comprising at least two fibrous materials, wherein the first fibrous material comprises pores having a diameter of between about 1 μ

m and 100 μ

m and the second fibrous material comprises pores having a diameter of between about 50 nm and 20 μ

m.

2. A scaffold according to claim 1, wherein the first fibrous material and the second fibrous material are made of different composition.

3. A scaffold according to claim 1, wherein the at least two fibrous materials form layers within the scaffold.

4. A scaffold according to claim 3, wherein the layers are substantially planar.

5. A scaffold according to claim 3, wherein the layers are adjacent with each other.

6. A scaffold according to claim 2, wherein the scaffold is a laminate comprising a layer of a first fibrous material bonded to a layer of a second fibrous material, and wherein the first and second materials are made of a different composition.

7. A scaffold according to claim 1, wherein the fibrous materials are non-woven.

8. A scaffold according to claim 1, wherein at least one of the first fibrous material and the second fibrous material are electrospun.

9. A method of promoting the regeneration of the dermis and the epidermis, the method comprising the steps of:

(i) placing a first fibrous material comprising pores having a diameter of between about 1 μ

m and 100 μ

m into a wound;

said first fibrous material being capable of colonisation by skin fibroblasts, thereby promoting the repair/regeneration of the dermis; and

;

(ii) placing a second fibrous material above the first fibrous material, wherein the second fibrous material comprises pores having a diameter of between about 50 nm and 20 μ

m, the second fibrous material being capable of colonisation by keratinocytes, thereby promoting the repair/regeneration of the epidermis.

10. A method according to claim 9, wherein the first fibrous material and the second fibrous material form part of a scaffold which is placed into the wound in a manner such that the first fibrous material is positioned beneath the second fibrous material.

11. A method according to claim 10, wherein the first fibrous material and the second fibrous material are made of a different composition.

12. A method according to claim 10, wherein the at least two fibrous materials form layers within the scaffold.

13. A method according to claim 12, wherein the layers are substantially planar.

14. A method according to claim 12, wherein the layers are adjacent with each other.

15. A method according to claim 10, wherein the scaffold is a laminate comprising a layer of a first fibrous material bonded to a layer of a second fibrous material, and wherein the first and second materials are made of a different composition.

16. A method according to claim 10, wherein the fibrous materials are non-woven.

17. A method according to claim 10, wherein at least one of the first fibrous material and the second fibrous material are electrospun.

18. A method according to claim 9, wherein the at least first fibrous material and the second fibrous material are provided as separate products which are positioned in the wound, either simultaneously or consecutively, and wherein the second fibrous material is located above the first fibrous product.

19. A method according to claim 9, wherein a third fibrous material is placed into the wound bed in a position above the first fibrous material of the scaffold or above the first fibrous product.

20. A method according to claim 19, wherein the third fibrous material is placed into the wound bed either after:

(i) a defined amount of time or (i) a defined amount of regeneration of the dermis and/or epidermis, or (iii) a defined degradation of the scaffold or the first fibrous product and/or second fibrous product.

21. A kit comprising a first fibrous material comprising pores having a diameter of between about 1 μ

m and 100 μ

m and the second fibrous material comprises pores having a diameter of between about 50 nm and 20 μ

m.

22. (canceled)