Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Matrices
Reexamination Certificate
2000-08-30
2004-08-10
Wax, Robert A. (Department: 1653)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Matrices
C424S078300, C424S486000, C428S316600, C514S001000, C514S002600, C514S023000, C530S402000
Reexamination Certificate
active
06773723
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention is directed to biodegradable matrices for tissue regeneration.
Polysaccharides, such as glycosaminoglycans that include hyaluronic acid (HA) have been used in a wide variety of biomaterials. Hyaluronic acid (HA), a naturally-occurring polysaccharide, has been used in matrix engineering in ophthalmic and orthopedic medicine. Clinical indications for HA alone are limited by its physical properties and the short residence time of the natural HA molecule. A formaldehyde cross-linked HA, Hylan, has been used in viscosupplementation of arthritic diseased joints (Takigami et al., 1993, Carbohydrate Polymers 22: 153-160.
Berg et al., (U.S. Pat. No. 5,510,418, issued Apr. 4, 1996) disclose glycosarninoglycans, such as, HA, chondroitin sulfates, keratan sulfates, chitin and heparin, chemically conjugated to a synthetic hydrophilic polymer, such as polyethylene glycol (PEG) that are used as injectable formulations or solid implants. Kimata et al., (U.S. Pat. No. 5,464,942 issued Nov. 7, 1995) disclose phospholipid linked glycosaminoglycans and their use as metastasis inhibitors. Sakurai, et al., U.S. Pat. No. 5,310,881 issued May 10, 1994, disclose glycosaminoglycan-modified proteins. Balazs et al., U.S. Pat. No. 5,128,326 issued Jul. 7, 1992, disclose hyaluronan cross-linked with divinyl sulfone.
SUMMARY OF THE INVENTION
The present invention provides biodegradable matrices for tissue regeneration, methods of making the matrices and methods of using the matrices.
A biodegradable matrix of the present invention comprises two layers, each layer comprising a cross-linked polymeric component that differ in their composition, density, and porosity, wherein each of the polymeric components is a derivative of a member selected from the group consisting of collagen, albumin, fibrinogen, fibronectin, vitronectin, laminin, hyaluronic acid, dextran, dextran sulfate, chondroitin sulfate, dermatan sulfate, keratan sulfate, chitin, chitosan, heparin, heparin sulfate and alginate.
The two layers are attached by either mechanical adhesion or chemical cross-linking.
The biodegradable matrices are made by forming a layer by reacting a polymeric component with a cross-linking agent such as divinyl sulfone or a dialdehyde. Then the second layer, which may be a slurry, is applied and may either mechanically adhere and gel onto the first layer or be chemically linked to the first layer by cross-linking agents. The second layer also comprises a cross-linked polymeric component.
The present invention also provides a method of using the matrix to regenerate tissue by applying the matrix at a site of desired tissue regeneration.
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Liu Lin Shu
Spiro Robert C.
Beyer Weaver & Thomas LLP
Depuy Acromed, Inc.
Wax Robert A.
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