In restless, uncooperative, or malnourished patients who are bedridden for long periods of time, improper fixation of the drain may lead to adverse care events such as localized skin crush injuries and prolapse of the tube during position changes. Optimal immobilization methods for the extension tube portion: 1. centered on the puncture point: be careful not to pull the film tightly and place it vertically. After applying the film, shape and fix it according to the shape of the indwelling needle so that the dressing is completely bonded to the connector, isolation plug and skin. 2. Seal the isolation plug: the film should completely cover the seat of the indwelling needle to form a completely closed sterile zone. 3. Extension tubing is U-fixed: U-fixed extension tubing utilizes the principle of a physical U-shaped connector. When there is only one fluid in the connector, the pressure on the left and right sides of the U-tube is equal when the fluid is not flowing, which reduces blood reflux in the catheter. In addition, the U-shaped fixation prevents the connector from exerting long-term pressure on the puncture vein, which can affect blood reflux. 4. The infusion connector is higher than the catheter head: after the infusion is finished, the sealing clamp is clamped tightly against the puncture point, which reduces complications such as blood return from the indwelling needle and tube blockage. 5. Y-shaped interface facing outward: the purpose is to avoid the Y-shaped tube part of the puncture vein caused by long-term pressure. Always keep the catheter clear to prevent infection.