Wearable medical instruments enable non-invasive, non-invasive medical monitoring of the human body, with features such as mobile operation, ease of use, and long-term continuous operation. It can reduce the physiological and psychological burden of the patient and achieve better detection results. Therefore, its development has received more and more attention.
1 Introduction
Wearable medical instruments enable non-invasive, non-invasive medical monitoring of the human body, with features such as mobile operation, ease of use, and long-term continuous operation. It can reduce the physiological and psychological burden of the patient and achieve better detection results. Therefore, its development has received more and more attention. At present, the wireless transmission means for the wearable medical instrument to realize the monitoring instrument from the human body to the upper computer of the user terminal include Bluetooth, radio frequency, infrared and the like. From the existing literature, Bluetooth is the most widely used. However, the high cost of Bluetooth is a big obstacle to the future of the instrument. The infrared transmission distance is short and the anti-interference is poor, and it is basically not used now. RF has the characteristics of low price and long transmission distance, especially the emergence of cost-effective RF chips, making its use more and more popular. This paper designs a radio frequency chip based on nRF905 to realize the wireless transmission of physiological signals. At the same time, compared with other similar designs, the design also fully considers the security of the user's physiological information, and encrypts the data before the data is transmitted wirelessly to protect the user's health and privacy.
2, the design of the system structure
The overall structure of the design consists of physiological signal acquisition circuit, data encryption, RF transmission, reception and several modules of the user host, as shown in Figure 1. First, the physiological data to be monitored is acquired by the acquisition circuit; then the acquired data is encrypted and then sent to the host through the radio frequency; the host performs subsequent processing on the received data. The front end and the back end can communicate with each other via radio frequency.
Figure 1 overall design block diagram
Hunan Kangfutai Medical Devices Co., Ltd. , https://www.3kfut.com