Development Of Precision Automatic Medical Infusion Pump

One of the most commonly used treatments in clinical treatment is intravenous infusion,which matches the appropriate infusion rate depending on the patient’s condition and the nature of the drug.If the infusion speed is faster or slower,it will affect the treatment effect of the patient and even aggravate the condition.The traditional infusion method generally uses the hanging bottle to convey the liquid medicine by using the liquid level difference,and observes with the naked eye,and manually adjusts the roller to control the infusion speed.This method can only adjust the infusion speed according to experience,the precision is low,and the workload is large.In order to solve the above problems,most of the current medical applications are imported infusion pumps,but imported infusion pumps are expensive and cannot benefit the public.Many domestic companies and research institutes also independently develop and produce some intelligent infusion pumps.Although the price is low,many of them have problems such as insufficient function and low control precision.The scope of medical applications is limited.Through the investigation of the market and hospitals,there is an urgent need for an intelligent infusion pump that is inexpensive,simple to operate,precise in control,and highly reliable.In this paper,STM32F103ZET6 single-chip microcomputer is used as the control core,and the method of controlling the stepping motor and the finger-shaped peristaltic pump by open-loop method is realized to realize low-cost,high-reliability and high-precision infusion control.Through the related technical principles of single-chip microcomputer,ultrasonic testing,stepping motor and pump device,we learn and understand the design scheme of precision automatic infusion pump.The design uses a finger-like peristaltic pump and improves its structural part.The motor controls the peristaltic pump through the rod-type belt drive,and the infusion control system is designed with the single-chip microcomputer and the control circuit to realize the automatic control of the infusion speed and the infusion volume function.The fitting curve method is used to improve the program and improve the accuracy of infusion.In order to effectively and accurately detect the bubbles generated by liquids of various traits,theoretical research and calculation are carried out according to the requirements of bubble detection accuracy and stability,and ultrasonic bubble detectors are designed to realize real-time intelligent detection of bubbles.After the completion of the development of the infusion pump,it has been proved by tests that the infusion pump can accurately control the infusion rate and the infusion volume by setting parameters of the button.The infusion speed accuracy error is <±5%,the infusion volume accuracy error is <±5%,and at the same time The bubbles generated by the infusion were accurately detected,and the minimum bubble diameter was measured to be 1.83 mm,and the bubble having a volume of 0.02 ml(diameter of 2.84)was stably detected at an infusion rate of 600 ml/h.The LCD display can display the working status of the infusion pump and user input information in real time.When the infusion is abnormal or the infusion is completed,the user is prompted by voice and light alarm.According to the experimental results,the test of all performances of the infusion pump basically meets the design requirements.The infusion pump can accurately and automatically control the infusion process according to the user’s requirements,ensuring the accuracy and reliability of the infusion,and providing safety for the majority of patients.