| The blood oxygen saturation is the percentages of the capacity that the oxyhemoglobin (HbO2) combined by oxygen in the blood accounts for all hemoglobin (Hb). It is the important physiological parameter of breathing circulatory system. Understanding the patient's blood oxygen saturation situation facilitates doctor's diagnosing and treating in time, it has very important meanings in clinical medical treatment. At present, there are two measurements in blood oxygen saturation: non-invasive measurement and vulnerary measurement. By vulnerary measurement, the doctor draws blood first, and then makes electrochemical analysis by blood gas analysis instrument to get partial pressure, after that can get blood oxygen saturation. Non-invasive measurement uses optical spectroscopy method. This method uses light source shine the measured part first, according to the received light intensity alteration, can deduce blood oxygen saturation and always chooses finger or earlobe as the measured part. The vulnerary measurement can get the accurate result, but the operation is very trouble, and the doctor could not measure it continuous, sometimes it makes patient discomfort and infected. Therefore, the study of non-invasive method monitors the blood oxygen saturation, which has extensive and practical significance.In addition, with the development of computer and communication technologies, medical guard instrument with network access function has become a development trend. Medical guard instrument with network function makes medical parameters enable information sharing between departments and departments, or between hospitals and hospitals. And even share medical data long-rangely through Internet network, realize remote diagnosing and treating. Thus, it can strengthen the hospital manage, improve the utilization efficiency of medical resources greatly, have increased the chance that people obtain medical care and medical education. Owing to the consideration of the above-mentioned factors, the thesis has proposed the embedded blood oxygen saturation measurement scheme based on the principle of spectrum measurement and embedded network technology. This measure operator shine the finger end with the light source that wavelength similar to wavelength of absorption peak of oxygen in the blood composition, afterwards under the modulation of pulsing on the heart utilize signal processing methods such as synchronous sampling integral and so on, obtain the dynamic absorption photoelectric signal, set up the equation group through multi-wavelength scanning, and then utilize the computing technology of number value to obtain the exact value of blood oxygen saturation. This paper develops the embedded network module based on TCP/IP protocol, makes measurement terminal insert Ethernet, and so realizes the network share of oxygen information.This paper totally includes seven chapters. The contents of the paper are as follows:The first chapter introduces the development of the non-invasive blood oxygen saturation measurement and networked medical instrument, and then talks about the research actuality in home and abroad.The second chapter presents the conception of blood oxygen saturation first, and then explains the principle of the photoelectric volume pulse wave blood oxygen saturation measure in detail. The thesis provides the concrete measurement method-transmitted blood oxygen saturation measurement: according to the difference of oxidized hemoglobin and reduced hemoglobin in absorbing different wave length, the paper selects two light sources whose wavelengths are 650nm and 980nm, after the light penetrated the finger, uses the optoelectronic diode to receive single, then the operator can detect the signal. From this signal the operator can get the information of blood oxygen saturation. Based on this method, this chapter puts forward the design proposal of blood oxygen saturation measurement system.The third chapter expounds the hardware circuit design of the embedded oxygen measurement system in detail. The chapter introduces the basic knowledge to develop the embedded system and realize the network function, takes LPC2210 microprocessor as the core to design the blood oxygen saturation data acquisition module, central processing module and network transmission module.The fourth chapter introduces the construction of the bottom software platform of the measuring system, including transplantation of the embedded operating systemμC/OS-Ⅱand TCP/IP protocol stack LWIP. The paper analyzes the principles and mechanisms ofμC/OS-Ⅱkernel, provides detailed ideas and process of transplantation. For realizing the Ethernet transmission function of the oxygen measuring system, need to imbed t TCP/IP protocol stack on the hardware platform. The project chooses a broader reduced embedded TCP/IP protocol stack LWIP. The chapter analyzes the structure and working principle of LWIP first, and then designs LWIP transplantation scheme on the operating system and provides concrete transplantation course and attentive matters. Last, this chapter designs the driver program of the Ethernet control chip RTL8019AS.The fifth chapter develops the application software on the bottom software platform. The paper makes a general plan to the application layer tasks; designs the acquisition task of oxygen initial data and the application task program of network module, the latter includes the design of B/S mode server task and design of C/S mode client task.The sixth chapter tests the work of the thesis doing. At first, this chapter does basic operation test to the operating systemμC/OS-Ⅱtransplanted to on the microprocessor LPC2210; then tests A/D; last, does function test to the network module based onμC/OS-Ⅱ+LWIP+application layer program, including B/S and C/S mode realized briefly. The test result proves the develop module can realize blood oxygen saturation data acquisition function, and can realize the Ethernet data transmission function of B/S and C/S two kinds of modes.The seventh chapter summarizes all this paper, briefs the job have done and the research results, and puts up some questions which should be researched continuously in the future.
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