Abstract: The present invention relates to a system for facilitating transdermal delivery of oligosaccharides, The system includes an apparatus that generates micro-channels in the skin of a subject and a skin patch. The patch includes a pharmaceutical composition containing an active agent of an oligosaccharide. Particularly, the oligosaccharide has 5 to 20 monosaccharide units, such as a pentasaccharide, which exerts anticoagulant activity. The system is capable of delivering the oligosaccharides into the blood circulation for treating thromboembolic diseases.