Abstract: Implantable tubular medical device for vasovasostomy in mammals and wherein the device is made from a hydrophilic compatible polymer, the polymer comprising a hydrophilic component, preferably N-vinylpyrolidone, a hydrophobic component, preferably N-butylacrylate and a cross-linker, preferably tetraethyleneglycol dimethacrylate and a method for the preparation of said polymer by polymerisation from its components.