Medical voltage generator for use in tissue ablation; medical probes and medical electrodes and parts thereof for use in tissue ablation; synthetic materials for embolization of blood vessels for medical use, namely, hydrogel embolic material; Catheters, namely, angiographic catheters, dialysis catheters, angioplasty catheters and drainage catheters; thromobolytic devices for dissolving blood clots; endovenous treatment devices for treating venous disease; vascular access devices for intravascular medical procedures; medical fluid control devices for contrast, saline and bodily fluids; vascular and non-vascular access sets for gaining entry to arteries, veins and other bodily lumens, comprised of needles, guidewires, dilators, and sheaths; vascular access and delivery needles; lines and fittings for use with injection, infusion, drainage and aspiration tubes; vascular and non-vascular embolization medical devices for occluding a body lumen; stents; medical guidewires