👉 Diacermy is a medical procedure that involves using a device called a cannula (a thin, flexible tube inserted into the skin) to draw blood from the body. This can be done through several different methods, such as inserting a needle into a vein or artery and drawing blood out of it. In diathermy, the cannula is placed in a vein, such as the femoral vein (which supplies blood to the leg), and then used to draw blood from the affected