Collagen scaffolds, medical implants with same and methods of use

• US 8,975,372 B2
• Filed: 04/24/2013
• Issued: 03/10/2015
• Est. Priority Date: 06/22/2006
• Status: Active Grant

• Current Assignee: University of South Florida (State University System of Florida)
• Original Assignee: University of South Florida (State University System of Florida)
• Inventors: Koob, Thomas J., Ju, Young Min, Moussy, Francis
• Primary Examiner(s): Carlson, Karen Cochrane
• Application Number:
  US13/869,460
• Publication Number:
  US 20140073704A1
• Time in Patent Office: 685 Days
• Field of Search: 530/350
• US Class Current: 530/350
• CPC Class Codes: A61B 5/14542 for measuring blood gases A61B5/14551 takes precedence
• CPC Class Codes: A61B 5/1486 using enzyme electrodes, e.g. with immobilised oxidase
• CPC Class Codes: A61B 5/14865 invasive, e.g. introduced into the body by a catheter or needle or using implanted sensors
• CPC Class Codes: A61L 2400/02 Treatment of implants to prevent calcification or mineralisation in vivo
• CPC Class Codes: A61L 2400/18 Modification of implant surfaces in order to improve biocompatibility, cell growth, fixation of biomolecules, e.g. plasma treatment
• CPC Class Codes: A61L 2420/02 Methods for coating medical devices
• CPC Class Codes: A61L 27/18 obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
• CPC Class Codes: A61L 27/24 Collagen
• CPC Class Codes: A61L 27/34 Macromolecular materials
• CPC Class Codes: A61L 27/48 with macromolecular fillers
• CPC Class Codes: A61L 27/54 Biologically active materials, e.g. therapeutic substances A61L27/227 takes precedence
• CPC Class Codes: A61L 27/56 Porous materials, e.g. foams or sponges
• CPC Class Codes: A61L 31/044 Collagen
• CPC Class Codes: A61L 31/10 Macromolecular materials
• CPC Class Codes: A61L 31/129 containing macromolecular fillers
• CPC Class Codes: C08L 89/06 derived from leather or skin , e.g. gelatin

Abstract

The subject invention concerns non-degradable three dimensional porous collagen scaffolds and coatings. These scaffolds can be prepared around sensors for implantation into a body. A specific embodiment of the invention concerns implantable glucose sensors. Sensors comprising a collagen scaffold of the invention have improved biocompatibility by minimizing tissue reactions while stimulating angiogenesis. The subject invention also concerns methods for preparing collagen scaffolds of the invention. The subject invention also concerns sensors that have a collagen scaffold of the invention around the exterior of the sensor.

Claims

1. A biocompatible collagen scaffold and/or coating for use with a device implantable in the body or tissue of a person or animal, wherein said collagen scaffold or coating comprises regularly distributed open pores and an interconnected pore structure and is embedded in a nordihydroguaiaretic acid (NDGA) bisquinone polymer matrix, and wherein said open pores are between about 10 μ

m to about 200 μ

m in diameter (mean).

2. The collagen scaffold and/or coating according to claim 1, wherein said open pores are between about 20 μ

m and 100 μ

M in diameter (mean).

3. The collagen scaffold and/or coating according to claim 1, wherein said open pores are between about 40 μ

m and about 80 μ

m in diameter (mean).

4. The collagen scaffold and/or coating according to claim 1, wherein said scaffold or coating comprises a hydrogel matrix integrated into or on said scaffold or coating.

5. The collagen scaffold and/or coating according to claim 1, wherein said collagen is from fish, starfish, sea urchin, sponge, shark, skate, ray, equine, bovine, ovine, porcine, canine, or feline.

6. The collagen scaffold and/or coating according to claim 1, wherein said scaffold comprises at least one of an antimicrobial, anti-inflammatory, and/or angiogenic compound, drug or growth factor.

7. The collagen scaffold and/or coating according to claim 6, wherein said growth factor is vascular endothelial growth factor (VEGF).

8. The collagen scaffold and/or coating according to claim 1, wherein said scaffold or coating comprises basic fibroblast growth factor, tumor growth factor beta, a bone morphogenic protein, platelet-derived growth factor, an insulin-like growth factor, fibronectin, hyaluronan, aggrecan, biglycan, or decorin.

9. A device having enhanced biocompatibility for implantation into the body or tissue of a person or animal, wherein said device comprises a biocompatible collagen scaffold or coating, wherein said collagen scaffold or coating comprises regularly distributed open pores and an interconnected pore structure and is embedded in a NDGA bisquinone polymer matrix, and wherein said open pores are between about 10 μ

m to about 200 μ

m in diameter (mean).