Polyanhydride bioerodible controlled release implants for administration of stabilized growth hormone
First Claim
Patent Images
1. A controlled release system for a protein comprising:
- a protein having physical, chemical and biological activity equivalent to that of somatotrophin;
a simple polysaccharide; and
a biocompatible, surface erodible, hydrophobic polymeric matrix selected from the group consisting of polyanhydrides, poly(orthoesters), copolymers and combinations thereof, wherein the polysaccharide and protein are incorporated within and released from the polymeric matrix, the ratio of polysaccharide to protein in the matrix is greater than 1;
1, and the rate of release of the protein in combination with the polysaccharide is more linear than the rate or release of the protein in the absence of the polysaccharide.
4 Assignments
0 Petitions
Accused Products
Abstract
A controlled release device for the administration of biologically active growth hormone proteins or peptide fragments, and method of preparation thereof, wherein biologically active growth hormone is stabilized and release rate modulated by incorporation of a stabilizing compound. The controlled release devices are prepared by mixing a stabilizer, such as sucrose, with a biologically active growth hormone, such as bovine somatotropic hormone, in solution, lyophilizing, then incorporating the dried powder into a surface erodible, biocompatible polymeric matrix, such as a poly(anhydride) or poly(orthoester) matrix.
93 Citations
11 Claims
-
1. A controlled release system for a protein comprising:
-
a protein having physical, chemical and biological activity equivalent to that of somatotrophin; a simple polysaccharide; and a biocompatible, surface erodible, hydrophobic polymeric matrix selected from the group consisting of polyanhydrides, poly(orthoesters), copolymers and combinations thereof, wherein the polysaccharide and protein are incorporated within and released from the polymeric matrix, the ratio of polysaccharide to protein in the matrix is greater than 1;
1, and the rate of release of the protein in combination with the polysaccharide is more linear than the rate or release of the protein in the absence of the polysaccharide. - View Dependent Claims (2, 3, 4, 10)
-
-
5. A method for making a delivery system for a protein comprising providing a protein having physical, chemical and biological activity equivalent to that of somatotrophin in combination with a simple polysaccharide and incorporating the combination within a biocompatible, surface erodible, hydrophobic polymeric matrix selected from the group consisting of polyanhydrides, poly(orthoesters), copolymers and combinations thereof, wherein the polysaccharide and protein are incorporated within and released from the polymeric matrix, the ratio of polysaccharide to protein is greater than 1:
- 1 and the rate of release of the protein in combination with the polysaccharide is more linear than the rate of release of the protein in the absence of the polysaccharide.
- View Dependent Claims (6, 7, 8, 9, 11)
Specification