Block copolymers, surgical accessories and method of sterilizing them

Materials for medical or veterinary use such as surgical sutures are coated with a special bioabsorbable blockpolyetherester to reduce the friction with the tissue. This blockpolymer comprises a block derived from epsilon -caprolactone and a comonomer, preferably an alpha -hydroxycarboylic acid, and a poly(alkylene oxide) block. Also described are a film or a coating for a mesh, prepared from a bioabsorbable aliphatic blockpolyetherester, for use as an adhesion prevention barrier for mammalian tissue.