The Poole Suction is a surgical instrument designed for suctioning fluids during procedures. The "Straight" version refers to its non-curved design, making it suitable for direct suctioning of large volumes of fluid from body cavities. The "30fr" indicates the French size, with 30 French being a larger diameter, which is typically used for draining heavier fluids or in cases where a higher flow rate is needed. It's commonly used in abdominal and thoracic surgeries.