Method of tissue repair using a composite material

• US 8,673,337 B2
• Filed: 12/29/2011
• Issued: 03/18/2014
• Est. Priority Date: 11/15/2002
• Status: Active Grant

• Current Assignee: University of Tennessee Research Foundation (University of Teesside), UT-Battelle LLC
• Original Assignee: University of Tennessee Research Foundation (University of Teesside), UT-Battelle LLC
• Inventors: Hutchens, Stacy A., Woodward, Jonathan, Evans, Barbara R., O'Neill, Hugh M.
• Primary Examiner(s): TRAN, SUSAN T
• Application Number:
  US13/340,114
• Publication Number:
  US 20120135086A1
• Time in Patent Office: 810 Days
• Field of Search: None
• US Class Current: 424/423
• CPC Class Codes: A61K 33/42 Phosphorus; Compounds thereof
• CPC Class Codes: A61K 47/38 Cellulose; Derivatives thereof
• CPC Class Codes: A61K 9/5078 with drug-free core
• CPC Class Codes: A61L 2430/02 for reconstruction of bones; weight-bearing implants
• CPC Class Codes: A61L 27/46 with phosphorus-containing inorganic fillers
• CPC Class Codes: A61L 27/52 Hydrogels or hydrocolloids
• CPC Class Codes: A61L 27/56 Porous materials, e.g. foams or sponges
• CPC Class Codes: A61P 43/00 Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00

Abstract

A composite biocompatible hydrogel material includes a porous polymer matrix, the polymer matrix including a plurality of pores and providing a Young'"'"'s modulus of at least 10 GPa. A calcium comprising salt is disposed in at least some of the pores. The porous polymer matrix can comprise cellulose, including bacterial cellulose. The composite can be used as a bone graft material. A method of tissue repair within the body of animals includes the steps of providing a composite biocompatible hydrogel material including a porous polymer matrix, the polymer matrix including a plurality of pores and providing a Young'"'"'s modulus of at least 10 GPa, and inserting the hydrogel material into cartilage or bone tissue of an animal, wherein the hydrogel material supports cell colonization in vitro for autologous cell seeding.

Claims

1. A method of tissue repair within the body of animals, comprising the steps of:

providing a composite biocompatible hydrogel material comprising a porous polymer matrix and a calcium salt, said polymer matrix comprising a plurality of pores and providing a Young'"'"'s modulus of at least 10 GPa, and said calcium salt disposed in at least some of said pores, and

inserting said hydrogel material into cartilage or bone tissue of an animal, wherein said hydrogel material supports cell colonization in vitro for autologous cell seeding, wherein said polymer comprises bacterial cellulose, and wherein said calcium salt consists essentially of calcium deficient hydroxyapatite disposed in said matrix in the form of crystals.

2. The method of claim 1, wherein said hydrogel material consisting essentially of bacterial cellulose, calcium salt, and at least one of bone morphogenetic proteins (BMP'"'"'s) or chondrocytes, wherein said bacterial cellulose provides a porous matrix, said calcium salt consists essentially of calcium deficient hydroxyapatite disposed in said matrix in the form of crystals, and said at least one of bone morphogenetic proteins (BMP'"'"'s) or chondrocytes is disposed in said matrix.