Two electrodes parallel to each other are formed on one of two substrates, homeotropic alignment films are formed on the substrates and a liquid crystal material having positive dielectric anisotropy is injected between the substrates. Ablation of the exterior layer of the arterial walls is performed using mechanical or laser ablation techniques. The stem of the tool carries a slidably adjustable cutting body thereon, with the cutting body being secured through an elongate slot formed in the center of the stem portion of the device.