I. Project design background and overview
1. Development purpose
As we all know, China has a large population, scarce medical resources, and hospitals are often overcrowded. Infusion as an important treatment, its audience is very wide, almost everyone has the experience of hanging water in the hospital. However, today, entering the information age, the infusion set still retains the most primitive functions, lacking intelligent or information-based control means, which is the most direct cause of the hospital's injection room disorder, the nurses are exhausted, and the patients are suffering. At present, the hanging infusion set used by the hospital has a device for controlling the flow rate, but cannot know the remaining time of the infusion, and lacks the alarm system after the infusion is completed, so that the patient cannot reasonably arrange the injection time, and the nurse has to be shouted loudly after the injection is completed. This has caused the sputum in the injection room, affected the rest of other patients, and also cost the patient's physical strength.
2, functional characteristics
The infusion set intelligent control system designed by the team can not only adjust the flow rate of the patient's infusion in real time, but also visually indicate the progress of the patient's infusion in the remaining time, and automatically prompts the infusion soon after the infusion.
3. Innovative and practical
The innovation of this device is that compared with the traditional infusion device, only the infusion function and simple speed control function are provided. The device gives the function of monitoring time and ending the alarm, so that the patient can accurately set the infusion time according to his own wishes. To achieve seamless integration with other issues and to arrange the work at hand. For example, just as we usually download movies, if we only know the download speed and do not know the remaining time of download, it will be very passive, unable to coordinate control and management of various download tasks, and can not reasonably arrange other affairs. And because of the remaining time, we can precisely arrange the download process and rationally allocate activities. For the hospital, the device can also enable medical workers to know the patient's infusion information in time to replenish and end the infusion, so as to be orderly, orderly, and ultimately improve efficiency. The utility of the device is that it is not necessary to modify the conventional infusion set, just add the device at the top hook. In addition, the structure is simple, easy to install and convenient to use.
Second, the project design principle
1, the overall design principle
From the physics knowledge, the hanging infusion bottle is mainly subjected to two forces: one is the vertical downward gravity G, and the other is the vertical upward pulling force F. Since F = G, the infusion bottle is still in the air.
In addition to the liquid in the infusion bottle:
(1-1)
(1-2)
(1-3)
From the above three formulas, you can get: 
(1-4)
Since it is a constant, it: 
(1-5)
Where K is a constant, it can be known that the tensile force F of the infusion bottle is linear with the volume V of the liquid in the bottle. Then by measuring the tensile force F, the volume V can be obtained.
Based on the above inference, the system can obtain the time required for the end of the infusion by measuring the amount of change in the tension of the infusion bottle for a short period of time, and doing the calculation with the pulling force F received at this time:
(1-6)
Note: F is the tension of the liquid after removing the gross weight of the infusion bottle.
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