Methods and devices for occluding a vessel during a percutaneous ablation procedure. A voice model associated with an individual is stored in the database. The nail is provided with at least a third through hole with axis in said far end which contains the first and second holes and the projection of the hole axis of said through holes in a plane orthogonal to said longitudinal axis is such that at least two of said projected hole axis are at an angle \u03b1 greater than zero and less than 90\xb0 with respect to each other. A controller signals an alarm when the ratio between the variation of the push force and the displacement exceeds a predetermined threshold. The change in the output frequency provides an indication of a change in a measurement parameter. Such fluoropolymer films are useful as antireflective or hydrophobic layers on substrates used in optical displays.