Patent ID: 7713307

Claim:
A layer ( 2 ′″) arranged on an implant ( 1 ″) for bone or tissue structure ( 5 ), that constitutes a boundary or barrier for the purpose of increasing retention and has a thickness (T′), said layer ( 2 ′″) further comprising: a channel network ( 6 ) that gives the layer porosity, wherein the channel network ( 6 ) has mouths ( 3 ′, 4 ′) on a surface ( 2 a ′) of the layer ( 2 ′″) adjacent to the bone or tissue structure and whose respective cross-sectional diameters (D) are in the range of 0.1 μm to 10 μm at the surface ( 2 a ′) of the layer, wherein sizes in the range of 0.1 μm to 10 μm for the cross-sectional diameters of the mouths—create conditions for bone growth, wherein the mouths of the channel network have cross-sectional diameters that are less than the respective depths of the channels in and down into the layer as seen from said surface ( 2 a ′), wherein the diameters of the mouths and the depths of the channels stimulate bone growth and contribute to the incorporation of the implant in the bone or tissue structure, wherein the channel network ( 6 ) comprises a combination of contiguous channel branches ( 12 , 13 , 14 , 15 , 16 ) which extend in at least both vertical and lateral directions within the layer ( 2 ′″) and toward a transition ( 11 ) between the layer ( 2 ′″) and the implant ( 1 ″), and wherein the layer has an average thickness in the range of 0.5-20 μm and the layer is an oxide layer.