Keep your eyes open! See the ultimate goal of wearing medical care
With advances in technologies such as cloud services, smart devices, and networking, the era of Internet of Things (IoT), which can be implemented in a short period of time and inexpensively, has arrived. All industries are slowly evolving in terms of innovation, speed, globalization, and intelligence. This change is known as the 4th Industrial Revolution, which creates a variety of cutting-edge technologies, including wearables and intelligence. Medical electronics.
The current smart medical market is still in an imperfect stage of development. Although each manufacturer has launched its own solution, the market has been in the stage of external heat and cold, and there is no systematic and effective application product to shock the market. The real reason is not only the cost, but also the two keywords "smart" and "medical". The so-called "intelligence" refers to whether it can be like a robot, regardless of remote control, voice control or gesture control, as long as the command is issued to listen to the command; "medical" refers to whether it can be accurately measured like a hospital and can correctly diagnose the condition. Of course, this is everyone's concern and the ultimate goal of the smart wearable medical market. In view of this, the electronic enthusiast network "Intelligent Medical Special" invites Mr. Zhang Ting, the first product planning department of the New Japan Wireless Electronic Components Division to discuss issues related to the wearable medical field.
Mr. Zhang Ting of the New Japan Wireless Advertising Planning Division said that the Sensor is the first necessary part of any wearable device. Its measurement accuracy is directly related to the processing and output accuracy of the latter data, and will be based on different conditions of use, use and The environment and the needs are very different.
Mr. Zhang Ting of the New Japan Wireless Advertising Planning Division pointed out that Nippon Wireless is mainly deployed in the medical electronics field with contact inlets (sensors), and has introduced various types of reflective photoelectric sensors to make measurement more accurate and application. More extensive, simpler product development, for the purpose of wearable device applications, but also from the audio sounding components, wireless connection RF devices and other aspects of the introduction of small, low-power products and solutions, these three are the main push The main product of smart wearable devices.
Hit the punch to launch the main products of wearable devices
The market for wearable devices and portable medical devices has indeed grown rapidly, creating an opportunity for the redesign and development of existing product groups. Mr. Zhang Ting said that the redesign and development of the existing product group does not mean reusing existing products, but on the basis of existing products, not only to reduce the size again, but also to greatly reduce power consumption. In addition to this basic design, the development of new features is also essential. At the same time, in the development of new functions, in addition to the combination of different types of products, the development of new uses is also the goal of the future products of New Japan Wireless.
When talking about specific products, Mr. Zhang Ting said that the current main push reflective photoelectric sensor, this product is a flagship product specially developed for wearable devices, using reflective measurement to change the current finger-clip measurement method. Reflective photoelectric sensors are compact products with integrated LEDs and light-emitting diodes or transistors.
Reflective photoelectric sensor for vital sign detection, the main feature is the use of reflected light for measurement, than the previous finger-clip measurement method is more widely used in the measurement site, any part that can measure blood pressure can be measured with this product . Mr. Zhang Ting said that the reflective photoelectric sensor does not have any pressure feeling like the finger-clip type, and the device can be easily measured by touching the body surface.
At the same time, in line with various application purposes, Nippon Wireless has introduced three combinations of light. Red light and infrared light are more suitable for measuring blood oxygen. Green light is more suitable for measuring blood pressure. The maximum deviation of the specified light-emitting wavelength is only 10 nm. The S/N ratio is highly accurate, and the light-receiving member is also equipped with a highly sensitive photodiode or phototransistor that receives only light of a specified wavelength.
In addition to the small size of the package, Mr. Zhang Ting pointed out that there is also the characteristics of reflow soldering suitable for mass production. The production process will not have any impact on the accuracy. Because it is used for body contact applications, it is environmentally friendly. The material and the LED light frequency are also in a low range, so there is no side effect on the skin. The general power consumption of the photoelectric sensor is 10 to 230 uW, so no heat is felt when the measurement is worn.
In order to facilitate other applications of the sensor, an illuminance sensor product is also provided, which is only used for sensitization purposes. For users who need to customize the illuminating wavelength and sensitized position, they can design and configure their own illuminating LEDs. In this way, the application of the sensor will be more extensive and the design will be more free.
In addition, in wearable applications, Nippon Wireless has also introduced a small, low-power buzzer driver and RF front-end module to provide a simple and high-quality solution for the sound-emitting and wireless communication functions of wearable devices.
The main features of the new Japanese wireless products are accurate measurement, convenient design, excellent performance and quality assurance.
Overcoming the difficulties of product design
The pulse is that the blood squeezes into the artery with the contraction of the heart, causing the arterial blood vessel pressure to expand, and the reflective photoelectric sensor is the light absorption characteristic of the blood to the visible to infrared range (as the amount of hemoglobin in the blood changes). A change in the optical parameters of the skin), when the amount of blood increases or decreases, a method of detecting the change in the diameter of the arterial vessel by detecting the amount of change in the reflected light.
Mr. Zhang Ting pointed out that the pulse oximeter measures the degree of deterioration of the disease or disease by measuring the proportion of oxygenated hemoglobin in the blood (oxygen saturation). When the blood encounters red light, the red oxygenated hemoglobin (HbO2) has a lower absorption rate for red light, and the red light mostly reflects and transmits; while the black deoxygenated hemoglobin (Hb) absorbs red light. Higher, reflected and transmitted light will be relatively small. Infrared rays have the same absorption rate for oxygen and deoxyhemoglobin, and the amount of reflection is the same. Comparing the magnitudes of the two types of reflected light received by the light-receiving element, the ratio of HbO2 and Hb, that is, blood oxygen saturation, can be known.
Among them, the main difficult technologies are the configuration of LEDs and light-receiving elements, and the design and packaging technology of the spacers between the LEDs and the light-receiving elements. Mr. Zhang Ting said that according to the optimal combination of LED light intensity and configuration distance and spacer height, a higher S/N vascular reflection signal can be obtained, using a symmetric configuration of the LED, and the light receiving element is located at the LED. In this configuration, even if the detection portion is deflected, the accuracy calculation of the detection signal is not affected.
Accurate layout targeting China's medical electronics market
At present, China's medical electronics market is still at the initial stage of development, and there is still a lot of room for development. Mr. Zhang Ting pointed out that China's disease diagnosis and treatment are still more dependent on hospitals, and the quality of hospital services and equipment are insufficient, resulting in chronic disease patients or patients with mild symptoms can not get long-term effective diagnosis and symptomatic treatment, it seems that regardless of the severity of the disease, All are treated according to intensive treatment. People often lack awareness of the continuous observation of physical health. They are generally ill to go to hospital, causing minor problems that cannot be discovered in time. The popularity of medical electronics in Chinese families has a long way to go, from the recognition of health observations. The purchase of medical devices, the popularity and accuracy of portable medical devices are equivalent to hospital equipment and operational aging are essential.
Finally, Mr. Zhang Ting stressed that New Japan Wireless has two strategic strategies for entering the Chinese market: one is from the performance of the product; the other is from the quality of the product. Simply speaking, product performance, in fact, includes improvements in all aspects: First, the product has full functions, can meet various user requirements, and pursue novelty, providing customers with unexpected solutions; second, the accuracy of the product is high, The accuracy of the measurement data is guaranteed and the error is minimized. At the same time, the quality of the product should take into account the various environments of use. For the harsh or unstable environment, the performance indicators of the product should be stable and stable; in addition to the durable quality assurance, the materials are also selected, not for the environment and the human body. Produce any harm.
Looking forward to the future development trend of Internet of Things technology
In the future, in order to realize the formation of the global Internet of Things, Mr. Zhang Ting pointed out that there are ten technologies, products or services that are necessary: ​​First, smart devices are expected to be used as bridges for M2M and M2P; second, public clouds, through With SaaS/PaaS/IaaS, it is easier to build a system on a global scale; third is a PoC cloud service for IoT; four is a very small and extremely thin sensor; and five is a wireless sensor network, which is expected to have low power consumption and multi-point connection; Sixth is short-range wireless communication; seven is ubiquitous computing module, refers to IoT/M2M equipment, devices, terminal embedded 3G/LTE communication module; eight is the development of SoC for IoT; nine is the development of single board machine, both small It is also cheap, and can be run in a GUI or browser using various development languages. It has a high-performance multi-function computer such as GPIO. The ten is to solve the power supply problem of IoT by using natural environment power generation, and to achieve long-term continuous and maintenance-free ideal new. energy.
This article is selected from the electronic enthusiast "Smart Medical Special Edition", more quality content, download now
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