| abstract |
The composition as described serves for in vivo cartilage repair. It basically consists of a naturally derived osteoinductive and/or chondroinductive mixture of factors (e.g., derived from bone) or of a synthetic mimic of such a mixture combined with a nanosphere delivery system. A preferred mixture of factors is the combination of factors isolated from bone, known as BP and described by Poser and Benedict (WO 95/13767). The nanosphere delivery system consists of nanospheres defined as polymer particles of less than 1000 nm in diameter (whereby the majority of particles preferably ranges between 200-400 nm) in which nanospheres the combination of factors is encapsulated. The nanospheres are loaded with the mixture of factors in a weight ratio of 0.001 to 17 % (w/w), preferably of 1 to 4 % (w/w) and have a release profile with an initial burst of 10 to 20 % of the total load over the first 24 hours and a long time release of at least 0.1 per day during at least seven following days. The nanospheres are composed of e.g. ((D,L)-lactic acid/glycolic acid)-copolymer (PLGA). The loaded nanospheres are e.g. made by phase inversion. The composition is advantageously utilized as a device comprising any biodegradable matrix in which the nanospheres loaded with the factor combination is contained. |