A medical device, comprising: an expandable tubular body comprising a plurality of braided filaments, wherein the expandable tubular body is configured to be implanted in a blood vessel, the plurality of braided filaments comprising: a substrate comprising at least one of cobalt, cobalt alloy, chromium, chromium alloy, nickel, or nickel alloy; a silane layer comprising a silane material on the substrate; and an outer coating comprising a phosphorylcholine material on the silane layer, wherein the outer coating defines a layer thickness of less than 10 nanometers, and wherein optionally: a) the expandable tubular body includes platinum or platinum alloy filaments braided with or combined with cobalt-nickel or cobalt-chromium alloy filaments and the platinum or platinum alloy filaments possess a layer of phosphorylcholine with no intervening layers between the filament and the phosphorylcholine, while the cobalt-nickel or cobalt-chromium alloy filaments possess the silane intermediate layer between the alloy filaments and the outer layer of phosphorylcholine; or b) the expandable tubular body comprises a platinum or platinum alloy filament which possesses the intermediate silane layer in addition to the outer phosphorylcholine layer, while a cobalt-nickel or cobalt-chromium alloy filament possesses an outer phosphorylcholine layer but no intermediate silane layer. a substrate comprising at least one of cobalt, cobalt alloy, chromium, chromium alloy, nickel, or nickel alloy; a silane layer comprising a silane material on the substrate; and an outer coating comprising a phosphorylcholine material on the silane layer, wherein the outer coating defines a layer thickness of less than 10 nanometers, and wherein optionally: a) the expandable tubular body includes platinum or platinum alloy filaments braided with or combined with cobalt-nickel or cobalt-chromium alloy filaments and the platinum or platinum alloy filaments possess a layer of phosphorylcholine with no intervening layers between the filament and the phosphorylcholine, while the cobalt-nickel or cobalt-chromium alloy filaments possess the silane intermediate layer between the alloy filaments and the outer layer of phosphorylcholine; or b) the expandable tubular body comprises a platinum or platinum alloy filament which possesses the intermediate silane layer in addition to the outer phosphorylcholine layer, while a cobalt-nickel or cobalt-chromium alloy filament possesses an outer phosphorylcholine layer but no intermediate silane layer. a) the expandable tubular body includes platinum or platinum alloy filaments braided with or combined with cobalt-nickel or cobalt-chromium alloy filaments and the platinum or platinum alloy filaments possess a layer of phosphorylcholine with no intervening layers between the filament and the phosphorylcholine, while the cobalt-nickel or cobalt-chromium alloy filaments possess the silane intermediate layer between the alloy filaments and the outer layer of phosphorylcholine; or b) the expandable tubular body comprises a platinum or platinum alloy filament which possesses the intermediate silane layer in addition to the outer phosphorylcholine layer, while a cobalt-nickel or cobalt-chromium alloy filament possesses an outer phosphorylcholine layer but no intermediate silane layer.