RFID is gradually being integrated with sensing technology. The combination of sensing technology and RFID technology will create an ubiquitous and always-aware "sensor network," which brings a new dimension to the management of medical supplies, especially blood management Opportunity. As one of the major manufacturing countries and consumers in our country, our country should firmly seize this opportunity to promote the development of local RFID industry and upgrade the level of social informatization.
RFID fusion sensor technology for the feasibility of blood management
The general flow of blood management business: a blood test registration a blood test a blood test a blood bank a library management (component processing, etc.) a blood out of a hospital for patients to use (or made of other blood products). In this process, often involves a large amount of data information, including blood donors information, blood type, blood collection time, place, handlers and so on. A lot of information to the blood management has brought some difficulties, coupled with the blood is a very perishable material, if the environmental conditions are not suitable, the quality of the blood that is destroyed, so the blood in the storage and transportation, quality Real-time monitoring is also crucial. RFID and sensing technology is an emerging technology that can solve the above problems and help blood management effectively.
RFID technology for each bag of blood to provide their own unique identity, and save the appropriate information for them, the information and background database connectivity, so the blood, whether in the blood collection point, or in the transfer point of the blood bank, or in the use of point hospitals , Can be monitored by the RFID system all the way, the blood in the transfer point of the information can be tracked at any time. In the past, people had to spend time and effort on the library. Before using, people also need to check the information manually. After using RFID technology, they can collect, transmit, check and update the data in large quantities in real time without the need of precise positioning, Library identification, but also to avoid the manual error checking often appear. The RFID non-contact identification feature can also ensure that blood is not contaminated under the conditions of identification and detection, reducing the possibility of blood contamination, it is not afraid of dust, stains, low temperature, can store blood special Environmental conditions to maintain normal work.
Sensing technology is a window of perception, acquisition and detection of information, it can achieve the collection and quantification of data processing fusion and transmission applications. Through the sensor real-time monitoring and collection of the blood environment temperature, the sealing status and the degree of oscillation, the timely processing and reaction of the sensing information through the system can effectively prevent the blood from deteriorating and ensure the blood quality.
Combining RFID with sensing technology, we can realize the intelligent informationization of blood management by using the RFID sensor tag that can improve the recognition efficiency, information tracking and the quality of the article in real time.
RFID sensor tag design
RFID sensor tags mainly by the micro-control unit, sensor unit, RF unit, communication unit, positioning unit and power supply unit.
1 micro control unit
Microcontrollers consist of embedded systems, including embedded microprocessors, memory, embedded operating systems, etc., and integrated watchdog, timer / counter, synchronous / asynchronous serial interface, A / D and D / A converter and I / O and other necessary functions and external devices. The unit's main functions include: responsible for the entire chip task distribution and scheduling, data integration and transmission, wireless data validation, data analysis, storage and forwarding, routing maintenance within the region's network, power management chip power Wait.
2 sensing unit
Sensing unit is mainly composed of sensor and A / D converter. A sensor is a device or device that senses a given measurand and transforms it into a usable output signal according to certain rules. Usually the sensor is composed of sensitive components and conversion components. The sensitive components collect the information that needs to be sensed externally and send them to the conversion components. The latter converts the above physical quantities into the original electrical signals that can be identified by the system, and through the integration circuit, the amplification circuit The plastic processing, the final A / D converted into digital signals and sent to the micro-control unit for further processing.
Taking into account the environmental conditions of blood storage and transportation requirements, the sensor unit contains a monitoring area of ​​temperature, pressure, light, vibration and many other physical signal test function.
3 RF unit
The radio frequency unit controls to receive and send the radio frequency signal, and choose to use multiple access methods such as space division multiple access, time division multiple access, frequency division multiple access and code multiple access to achieve simultaneous multi-target identification and system anti-collision mechanism.
4 communication unit
The communication unit is used for data communication and solves the problems of carrier frequency selection, data transmission rate, signal modulation and coding in wireless communication, and sends and receives data between the chip and the reader through the antenna. The communication unit is provided with data fusion, request arbitration and routing Choose other functions.
5 Positioning unit
Positioning unit to achieve their own location chip location and information transmission orientation. Based on wireless transmission protocols such as the IEEE 802.15.4 standard and the ZigBee protocol. Positioning algorithm can choose based on ranging (such as signal strength ranging, ranging from time difference, etc.) or not based on ranging methods (such as the centroid method, DV-Hop algorithm, etc.).
6 power supply unit
RFID sensor tags are passive, semi-passive and active points. Passive tags do not require a built-in battery chip, which works by extracting RF energy from the reader. Semi-passive and active tags require internal battery power to maintain normal sensing and RF operation. Taking into account the real-time monitoring of blood products in blood management needs to ensure its continuous, normal energy supply, so joined the power supply unit, designed as semi-passive or active label.
In this part, we can solve the problem of energy consumption and transmission reliability by reasonably setting the receiving, transmitting and standby states of the chip, and effectively prolong the service life of the chip.
Application of RFID Sensor Label in Blood Management
Mainly from the blood out of stock management, blood tracking management, blood quality control management introduced in three aspects, pointed out that RFID fusion sensing technology in blood management in the effective role.
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