| The physiological parameters of the human body can reflect the running state of human tissues and organs,and are an important basis for judging human health.How to accurately measure the physiological parameters of the human body is of great significance for the diagnosis and treatment of human diseases.How to quickly and accurately calculate the blood loss of patients during surgery and timely supplementation of blood volume according to blood loss is the basic guarantee for successful operation.At present,the multi-parameter monitors that have appeared on the market are divided into two categories: one is a fixed bedside monitor.Although this monitor has powerful functions and good performance stability,it is bulky and portable and has poor mobility.These monitors also have poor performance,and complex operating system,and high professional skills requirements for operators.The other type is the monitor with the embedded microcomputer controller as the core.The monitor is light and compact,which is suitable for carrying,but it has a single function,and has not multiple physiological parameter monitoring functions,and has not wireless communication function.At present,the blood loss measurement of patients during surgery is still estimated by a rough way of gauze.There is no instrument that can accurately measure the real-time blood loss of patients during surgery.Based on the shortcomings of the current monitor,the monitor designed in this thesis is a multi-parameter monitor based on Android system.The Android platform is selected as the upper computer development platform,and the wireless communication with the lower computer monitor can be realized through Bluetooth,which can meet the Chinese market well.The lower computer adopts MSP430FG4618 single-chip microcomputer control,which has the advantages of low power consumption,strong processing capability and rich internal integration resources,can realize portable,long-time and high-precision multi-parameter simultaneous acquisition.The monitor can display the monitored physiological parameters in real time in the central monitoring system and transmit the monitored physiological parameters to the guardian's mobile phone client to monitor the elderly or the patient.The physiological parameters that can be monitored include blood pressure,heart rate,oxygen saturation,and body temperature.And the amount of blood loss during surgery can provide a strong basis for patients to supplement blood volume during surgery.The monitor designed in this thesis has the characteristics of simple operation,adaptability too many types of people,low power consumption,small size,and light weight,low cost and strong anti-interference ability.The monitor designed in this thesis accords with development direction of multi-parameter monitors.(1)The determination of the detection methods of each physiological parameter: In this paper,The oscillometric method is used to measure the blood pressure value.The heartbeat value is calculated according to the characteristic points of the pulse wave.The Blood oxygen saturation value is calculated according to the intensity of the transmitted light transmitting through the finger.The body temperature value is calculated by the correlation between the platinum resistance PT100 and the temperature.The patient's intraoperative blood loss is measured by combining ultrasonic waves with the electronic scale,and the height of the liquid surface in the blood storage bottle is measured by ultrasonic waves,and the weight of the blood in the gauze is measured by the electronic scale.According the above detection method,the MSP430FG4618 single-chip microcomputer with low power consumption strong processing capability and rich internal integration resources was selected as the hardware processor of the monitor.(2)Monitor hardware design: The blood pressure hardware detection circuit controls the air pump and the air valve drive circuit to charge and deflate the cuff.The pressure sensor is used to detect the pulse baseline pressure of the human body and the superimposed arterial pressure signal which is converted into ADS1294.The digital signal is transmitted to the single-chip computer to process and calculate the systolic pressure and the diastolic pressure value.The acquisition and processing circuit using the DC blocking circuit and the filter circuit is used to remove the DC component and the high-frequency noise of the pulse wave signal,he heart rate value amplified by the second-stage amplification circuit is calculated by the single-chip computer processing.The acquisition and processing circuit of the blood oxygen saturation controls the light-emitting diodes to alternately emit light by using the blood oxygen probe driving circuit,and the transmitted light signal passing through the fingertip of the human body is filtered and amplified by the pre-differential filtering amplification circuit and the ADS1294.The acquisition and processing circuit of body temperature uses platinum resistance PT100 and related resistors to form a temperature-measuring bridge circuit.The signal measured by the bridge circuit is differentially amplified by a differential amplifier circuit,and then is subjected to analog-to-digital converted by AD623 and transmitted to the microcontroller for processing.The signal processed by the measurement and processing circuit of intraoperative blood loss is transmitted to the microcontroller for calculating the amount of blood loss from the intraoperative patient.(3)System software development: The MCU software control program is written and debugged by IAR Embedded Workbench software,and combined with the hardware detection method to write the program to realize the control of the hardware module circuit.The Android system APP software is built in the Android platform under the Eclipse development tool,and the JDK and Android SDK development collection package are embedded into the Eclipse development tool.Combined with the needs of the paper,we design a physiological parameter and blood loss collected by the monitor.The matching APP software can realize the Bluetooth function of the Android system platform and the Bluetooth module of the monitor hardware designed in this paper.After the matching successes,the software can display the received data and realize the patient information and physiology.The parameters are saved and the voice is broadcasted,and the physiological parameter information can be sent to the guardian's mobile phone as a short message.The monitor designed in this paper can quickly measure the physiological parameters of the human body and the amount of blood loss during the operation,and transmit the detected values accurately to the Android system platform by Bluetooth.The APP software on the Android system can quickly and accurately display the received physiological parameters of the human body and the amount of blood loss during the operation.The patient's information and physiological parameter information can be safely stored on the SD card,and the history record of the physiological parameters of the patient can be conveniently viewed.The physiological parameters measured in real time can also be sent to the guardian's mobile phone client,and the guardian can view various physiological parameters monitored by the monitor from the mobile phone client.The physiological parameter information realizes selective voice broadcast,which can meet the needs of different people for text or voice mode.In the experimental part of this thesis,the collected physiological parameters were compared and tested.The blood loss parameters were tested and verified by the measurement standard equipment of Taian Central Hospital.The results prove that the monitor designed by this thesis the collected physiological parameters of the human body have high accuracy and can meet the design requirements well. |
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