An implantable biodegradable medical device arranged for breast reconstruction and/or augmentation, made of an interconnected porous structured polymeric matrix and belonging to the family of poly(urea urethane)s.The porous structured polymeric matrix of the medical device comprises a plurality of three dimensional channels, drilled by means of heated tools, three-dimensionally propagating through the polymeric matrix ad interconnected with the porous structure of the polymeric matrix.The polymeric matrix comprises high to-medium molecular weight hydrophobic biodegradable amorphous soft segments polyols, having average molecular weight comprised between 20,000 and 60,000 Da, hydrophilic polyalkoxide polyols, of average molecular weight comprised between 2,000 and 15,000 Da, and low molecular weight polyisocyanates and polyols, whose average molecular weights range between 15 and 200
