Atmospheric pressure principle of infusion set

1. Gravitational titration principle: The liquid in the dropping speed regulator is provided by a vertically suspended infusion bag. When the liquid level in the infusion bag is higher than the outlet of the dropping speed regulator, the liquid naturally flows downward under the action of gravity, and the dropping speed is controlled by the regulator. The atmospheric pressure here is not directly involved in liquid propulsion, but is realized by gravity.

2. Principle of pressure difference: Some advanced infusion devices, such as electronic infusion pumps, use atmospheric pressure difference to drive liquid flow. In this device, the infusion bag is usually located at a lower position, and the infusion tube is connected to a syringe or a pump. When the required flow rate and pressure are set, the pump will generate a negative pressure area, so that the liquid can be pumped in and sent to the patient through the pipeline. Atmospheric pressure here plays a key role in promoting liquid flow.