Radiofrequency (RF) cannulae designed for easy and precise placement on the nerve to be treated. such as a painful spinal nerve. The cannula is placed percutaneously and an RF electrode is placed together with it to supply the RF energy to the tissue to be treated and measure its temperature. These cannulae are smooth manageable and cost-effective use with thermocouple electrodes (TC). The insulation of each cannula is thinner at the tip for easy insertion and manoeuvre, additionally the echogenic version improves the visibility of the tip in ultrasound images. They are available in all sizes and shapes used for the treatment of pain.