Surface textured implants

A radially expandable device for introducing into the body tissues of a subject to produce a beneficial effect, said device comprising:

• an upper surface able to contact tissue at a treatment site of the body;
• wherein said upper surface comprises a coating and a plurality of texture features designed to interact with said coating and cause fragments of said coating to flake off said upper surface as a result of radial expansion of said device at said treatment site wherein the texture features comprise stress risers that have peak-peak height (Sz) values of between 2000 to 19000 nanometers and that define discrete surface regions and control the size and the shape of the fragments and wherein the maximum width of the discrete surface regions are from 0.1 μm to 50 μm.