Bluetooth technology is a communication protocol for personal wireless networks, which originated in 1998, a advanced close-up wireless communication technology jointly launched by 5 companies such as Ericsson, Work BM, Intel, Nokia, and Toshiba. In February 1998, with Ericsson as headed, Joint Toshiba, work BM, Intel and Nokia have established a Specialinterest Group, and jointly released Bluetooth radio access technology, which establishs and uses general, advanced wireless. Interface technical standard. There are thousands of companies that have thousands of companies to participate in support and develop Bluetooth technology and their related products. The ultimate goal of Bluetooth technology is to establish a global unified wireless connection standard that enables various mobile, portable devices, and fixed terminals produced by different manufacturers to automatically connect with radio in close range, and achieve interoperability and information sharing.
Bluetooth technology attracts numerous attention from the beginning of its unique, practical charm, and it has attracted many attention from the beginning of 9mm} 9mm microchip and Bluetooth wireless transceiver, and the transmission distance is 10 meters, replacing all digital devices. The wired interface. For example, computers, hosts, keyboards, printers, and displays, can save chaotic cables; mobile phones apply Bluetooth technology to separate mobile phones and headphones, easy to drive and business activities. This can be seen that Bluetooth technology can be expanded as people's needs, and increasingly entering all walks of life, the technology is also gradually introduced in medical equipment.
With the continuous development of modern society, modern medical undertakings have also achieved vigorous development. The emergence of hospital ward supervision systems and medical consultation systems has made outstanding contributions to the development of modern medical undertakings. But its biggest drawback is the cable on the patient, not only brings a lot of inconvenience to the patient's actions, but also to interrupt monitoring of patient's condition or require manpower monitoring when the patient needs large area activities.
Most applications initially considered by Bluetooth are used to replace wired connections. Medical equipment is basically an independent system in hospital per equipment, so various devices are equipped with their own computer systems and printers, all of which are independently connected by data lines, so read machine status, reconfigure the device. , Sensor data, patient information, patient monitoring, safety} T Q questioning data, asset tracking, etc. For security considerations, it is an independent system, the most common phenomenon such as operating room, so the squatting room, you can see the cable connection, Detained on the ground, once the instrument is faulty, spend a lot of hard work to check if each interface is connected, and the finishing line is very bad, so that it is very precious for the speech for many times. . In all devices behind the Bluetooth technology, the trouble of medical equipment users is solved.
Some medical instruments, such as electrophysiological instruments such as electrocardiography, electrocardiographs, are received from the patient's body surface, and the biotechnology signal is transmitted into medical equipment through cables. Because of the connection of the cable, the patient's position and movement can only be subjected to physical examination in the lying position, so it cannot be learned to have a living signal in other position, even in motion states.
Some medical penalty areas, such as laminar wards, operating rooms, radiographic chambers, radiotherapy rooms, rescue rooms, etc., are not suitable for all medical staff, must have a strict isolation system, Bluetooth can play it in these places. The role of the doctor can make some inspections and treatment of wireless remote control, reducing the probability of direct access to the staff while doing hindering the doctor's treatment and consultation.
Multi-machine communication must guarantee reliable communication with the selected slave, and the communication interface must have strong recognition capabilities, which is easier to interfere with Bluetooth multi-machine communication, so the interference requirements of the outside world are as small as possible. Need to have a relatively reliable communication protocol.
The composition of the Bluetooth protocol: Bluetooth protocols As an open close-range high-speed communication standard, including the following four aspects: Bluetooth core agreement (BB, LMP, L2CAP, SDP), cable alternative protocol (RFCMM), telephone control protocol ( TSC binary, at command set), and use protocols. Depending on the specific application, the Bluetooth protocol can be flexible and encourages the use of various high-level protocols to ensure the fusion of existing network technology and Bluetooth technology. Therefore, in addition to the Bluetooth core protocol is required, other three protocols are determined according to the specific needs of the application.
The requirements and implementation of physiological telecommunications transmission: physiological electrical signals are electrical signals transformed into specific characterizations generated by organisms, organizational, organs, and cells in life activities, reflecting specific life activities details. Here mainly refers to Bluetooth data transmission for one-dimensional telecommunications, such as: heart sound, muscle electricity, stomach, and blood pressure, pulse, breathing such as electrical signals, etc.. According to the frequency of the signal, it can be divided into three categories: (1) low frequency signal, the maximum frequency is 250Hz, which is representative of ECG; (2) high frequency signal, mainly heart sound; (3) broadband high frequency signal, refers to mycopad .
Inhibiting radio electromagnetic interference: Bluetooth works in global 2.4GHz ISM (ie, industrial, scientific, medical) band. Bluetooth data rate is 1MB / SO frequency hopping technology is to divide the frequency band into a number of frequency hop channels. In a connected connection, the radio transceiver is constantly from one channel to another in a certain code sequence (pseudo-random code). A communication channel, the Bluetooth system, the transmission and reception of the Bluetooth system is to communicate according to this law, while other radios cannot work according to the same law. So to a large extent, radio is suppressed.
Establish "Personal AreaNet): Bluetooth uses spread spectrum technology to make the noise impact in the Bluetooth frequency band minimum. Compared with other operations, Bluetooth FM is faster, Bluetooth is faster, and Bluetooth devices are low-power, and Bluetooth technology, the mobile phone, the radio transceiver, can reach 10 meters, and use high gain antennas. Expand the effective communication range to 100 meters. Not limited to lines in line, even the equipment can be linked to each other in the same room, and can link multiple devices, up to 7, the online device can reach 200, so you can link the user around the user. Get up, form a "personal micro network."
Do not enable bioelectric signals to be affected: Bluetooth technology has stable transmission signals, it is not easy to be interfered and unscrupulous, etc., in general, through Bluetooth technology, can effectively replace medical sensors and analyzers in traditional ward monitoring systems, Cables between PDAs and computers.
Wireless real-time monitoring of human life parameters is a common desire for medical and patients, but there is no disadvantage that traditional electronic technology is implemented. Bluetooth can not only replace the data cable around the individual computer, but also meet the needs of the patient's peripheral radio in the monitoring area. The Bluetooth Monitoring Network and the seamless connection of the Bluetooth monitoring network can be realized by the Bluetooth Bluetooth gateway, thereby combining the advantages of a variety of different networks, bringing a simple and comfortable environment for the patient.
Any medical device is used first, it is necessary to ensure clinical use to people's absolute safety, in order to be used by the patient. Security includes information security and ecological security.
Experiments have shown that the use of the microwave oven slows down the speed of 300k / s, except that spread spectrum equipment, frequency hopping equipment, wireless LAN, etc., the data transfer speed is slowed down. However, international SIG has done experiments in various environments, and low-power Bluetooth products interfere with other similar products micro-micro. In contrast, other products are solved by software or hardware methods. Therefore, information security issues are more emphasized in the software protocol stack, and the software engineer is mainly solved.
Ecological security issues refers to whether or not there is an ionizing radiation when the Bluetooth device is critical, mainly ionizing radiation, etc. The group composed of experts from the World Health Organization, Work Eee, said that the radiation of Bluetooth products did not find the radiation of the Bluetooth product in the test. Bluetooth problems are mainly due to the same frequency range like Bluetooth and microwave, although there is no consequences, some organization analysis believes that Bluetooth output power is small, only 1MW, is a million points for microwave use power. One, is only one of the third of the radiation of the mobile phone, and only a small portion is absorbed by the object in these outputs, and the partially detecting is not increased.
In a long time, Bluetooth replaces the opportunity of existing wired systems, and the speed of development will be faster in the short term. Increased through wireless connections, although slower, long-term potential, has a good development prospect.
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