the present invention relates to the synthesis of a haemocompatible polymer , consisting of a polyurethane bound covalently to sulphated hyaluronic acid . these sulfated derivatives have anticoagulative , non - thrombogenic , antiviral and anti - inflammatory properties . they also have the ability to inhibit platelet adhesion , aggregation and activation . the invention is particularly advantageous in resisting the enzyme hyaluronidase , therefore ensuring anti - coagulant activities for longer periods of time when compared to similar compounds . this biocompatible polymer material is well suited for surgical or other medicinal uses .