infusion set

General infusion set can have liquid propulsion device, digital display, control part and alarm part. The pushing device can be divided into creeping type, rolling type, piston type and screw cylinder type. At present, most of the infusion uses peristaltic type, which is a row of presser feet to squeeze and relax the leather strip in sequence, so as to achieve the function of promoting liquid. The presser foot in this way is like peristaltic mode, and the liquid flow rate can be increased by accelerating the peristaltic frequency. Micro syringe using screw to turn the rotary motion into linear motion. There is a linear grating moving with one side of the screw, which can accurately measure the flow rate with an accuracy of up to 0.1 ml/h. The driving force of the device is generally a coreless motor, which has a small moment of inertia and is easy to control. The motor voltage is DC pulse, and there is a grating on the motor shaft to control the rotation of the motor.

Because the liquid is directly input into the patient's vein, it is related to the patient's safety to a large extent, so there must be an alarm system to stop the infusion in time when an abnormal situation occurs, and send out a light alarm and a whistle alarm, which is the medical staff to deal with it in time. The alarm can have a pressure alarm for whether the infusion tube is blocked, and a liquid alarm for knowledge of whether the liquid is used up and an air bubble alarm in the infusion tube. All the working states of each function are performed by the microprocessor.