|Thesis Advisor||梁自泽 ; 李恩|
|Place of Conferral||北京|
|Keyword||透析机 控制系统 流量 电导度 温度|
Hemodialysis machine is a kind of medical equipment for blood purification, which has been widely used in clinical treatment. With the rapid development of electronic technology and medical technology, hemodialysis is developing toward the direction of precision, humanization, higher safety and multifunctional treatment modes, the function and performance of hemodialysis machine have been put forward for higher requirements. At present, China's high-end hemodialysis machines mainly rely on imports, domestic dialysis machines can only achieve the mostly basic dialysis processes, the level of intelligence and security are urgently needed to been upgraded. Therefore, the research of composite functional hemodialysis machine is of great significance to improve the level of medical technology and reduce the cost of medical treatment.
In order to improve the overall control performance of the composite functional hemodialysis machine, the design of control system and research on control methods are studied in this paper. Through the design of a dialysis machine's special hardware modules, this paper has get integrated solutions of the control system. Through the software development in components, the opening control-software system has been formed. Through the research of control methods about dialysate flow rate, conductivity and temperature, the key-performance indicators of the dialysis process have been controlled. The main work of this paper is as follows:
1. Based on the full analysis of the existing principle and control process of hemodialysis machines, the hardware-designing scheme of the new system in the dialysis machine has been completed. Its structure is designed for distributed structure and taking more than one processor to complete the signal acquisition and control functions. Through the modular designs of the hardware unit, the control module with different functions is formed, which has improved the flexibility and maintainability of the system.
2. Based on different embedded operating platforms, the software development of the logic control in the lower computer and the human-computer interaction with logic processing in the host computer was carried out. The logic control software, oriented with the software architecture facing functional task and based on the μC/OS-II operating system, was developed into corresponding software components for data acquisitions, equipment's communication, safety monitoring, process control and other tasks. It is through the logic task of component's online-configuration to realize the dynamic organizations of operation processes. The software of human-computer interaction with logic processing was oriented on the architecture facing functional task and interacting processes. It is basing on the Linux-3.5 operating system and independly designed for human-computer interaction, logic processing and peripheral communication, which are through inter-processing communications to achieve human-computer interaction and the management of dialysis processes.
3. Based on the realization of basic dialysis processes, this paper carried out research on control methods about the three key parameters: flow, conductivity, temperature in the process of dialysis. For the problem of flow measurement, the scheme of reverse solution for the actual flow rate through the balance cavity's volume was designed and realized feedback adjustment and control to the flow rate. For the problem of fluctuations in dialysate conductivity, the design of phase record mechanism of piston pump has avoided the phase error and realized the control of dialysate conductivity. For the problem of dialysis temperature control with large time delay and multiple interference factors, an energy model predictive control method is designed, which can effectively avoid the modeling error and external disturbances and realized the accurate control of the dialysis temperature. Simulations and experiments verified the effectiveness and correctness of these control algorithms.
|兰盛. 血液透析机控制系统设计与控制方法研究[D]. 北京. 中国科学院大学,2016.|
|Files in This Item:|
|血液透析机控制系统设计与控制方法研究.p（3951KB）||学位论文||暂不开放||CC BY-NC-SA||Application Full Text|
|Recommend this item|
|Export to Endnote|
|Similar articles in Google Scholar|
|Similar articles in Baidu academic|
|Similar articles in Bing Scholar|
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.