In particular, a device having a surface comprising a laminate coating, the outer coating layer, having a core portion (i) molecular weight 14～1,000Da, the (ii) the total molecular weight 1,500~1,000,000Da it is, of (iii) the total molecular weight, the ratio for the molecular weight of the core portion, at least 80: is 1, and (iv) having a functional end group, wherein one or said functional end groups 2 above, having anticoagulant substance covalently bound thereto, comprising a plurality of cationic hyperbranched polymer molecules, wherein, said device is described.