A variable ratio transmission having an infinitely variable ratio, for enabling a tidal turbine or the like running at relatively low but continuously varying speeds, to drive smoothly a constant speed machine, such as a synchronous generator or the like, without excessive transient torques. Using this precursor solution formulation enables formation of a film having a dielectric constant less than 2. In one of the embodiments, the mechanical thrombectomy device because of the textile structure has a very low overall profile or thickness that is less than 0.