In recent years, smart wearable devices have quietly become research hotspots, and the development momentum is very rapid. Headed by iWatch and Google Glass, technologies and consumer companies such as Apple, Samsung, Sony, and Nike have begun to deploy resources in the smart wearable device industry in advance. The entire consumer market has also set off a wearable device boom and revolution.
Judging from the information disclosed by Apple, the iWatch team has been increased to 200 people. The team comes from talent experts from all walks of life. It seems that iWatch has not been released yet and it is destined to be extraordinary. Let's take a look at which heart rate/EC monitor sensor will be used by Apple iWatch?
At present, the most anticipated consumer electronics products are not iWatch. Although some features are constantly being guessed on the Internet, what kind of heart rate/ECG monitoring technology will be used, we basically use the news that has been exposed. Not found on. Of course, everyone knows that it will have health/health functions, and there are articles that reveal that Apple has dug a lot of well-known experts in health care.
Comparison of two main heart rate/electrocardiographic techniques
There are two main ways of current mainstream: one is the measurement using light reflection, and the other is the measurement using the potential. The former is mainly for photoelectric sensing measurement, and the latter is for electrode sensing measurement. At present, the photoelectric measurement method can mainly measure the heart rate and blood oxygen index, while the electrode type measurement index is more comprehensive, and the electrocardiogram can be directly measured.
In this regard, the technical leader of Shennian Zhang Wei explained: For example, our electrode chip extracts a complete ECG, rather than a simple heart rate information. There are many detailed health information in the ECG, such as the PQRST five waveforms. It is the basis for doctors to judge heart health. However, the photoelectric method can't do such a fine heart rate test. It mainly measures the heart rate through light reflection: the photoelectric heart rate is based on the principle that the body's whole blood vessels will have slight fluctuations when the heart beats, and a beam of light is emitted onto the wrist of the person. Use the camera to observe the reflected shadows. If there is a slight change, the heart is considered to be beating once. Therefore, the photoelectric heart rate method has several characteristics:
First, to emit light, so the energy consumption is slightly higher;
Second: Inaccurate, because of any interference from external light, a series of misjudgments will occur;
Third, the amount of information contained is small and no more health judgments can be made;
Fourth, in order to enhance accuracy, this technique requires the watch to be placed close to the wrist, reducing external light, making the wearer uncomfortable, and it is difficult to ensure that the watch is not loose during exercise.
Fifth, the ECG solution takes up a small amount of space, and the related hardware of the photoelectric heart rate takes up more space.
Despite the above shortcomings, photoelectric measurement can be operated with one hand. It does not need two contacts, that is, two hands to detect data, as in the potential mode. This can realize active reading of data and remote reading of data, and is more suitable for matching large clouds. Data service.
"In fact, many shortcomings of the photoelectric method can be adjusted and corrected by the circuit at the back end. This is the technical challenge and threshold." Wang Sheng, head of ADI Medical Electronics, said: "Photoelectricity is indeed a big challenge and is greatly affected by the environment. Even different skin tones can affect the signal link, let alone motion. Therefore, the photoelectric type needs to do a lot of processing in the back-end circuit, including the motion removal function."
He also specially reminded: "The smart watch manufacturers themselves also have great challenges. It is very simple for terminal manufacturers to produce a smart watch sample, but it is difficult to achieve a good experience. The debugging takes a long time to see the manufacturer's performance requirements. For example, the movement removal mentioned above requires different adjustments for different sports such as basketball, football, sit-in, and rest. Therefore, I think that a smart watch with many health functions is not an ordinary consumer electronics product. The technical challenge is very, very big. Without core technology, it is very difficult to go down. Unlike mobile phones, smart watches and bracelets are more differentiated and more difficult. Don’t look at the current drilling of everyone. The number of manufacturers will be eliminated by 90%."
Can the electrode ECG measurement be one-handed?
Therefore, relatively speaking, there are more manufacturers that can provide mature electrode solutions. The ADI and ADI mentioned here are the main push electrodes.
The electrode type currently has three electrodes and two electrode solutions, that is, three contacts and two contacts (three-finger or two-finger touch are required) to read data, so that the data cannot be actively read. This is the biggest problem with the electrode type, because the consumer needs to consciously measure, and can not automatically measure and upload the number without interruption, and can not achieve remote monitoring. "We originally wanted to add the remote monitoring function of the children to the smart watch for the elderly, but the electrode scheme adopted now cannot actively read the data, and the user needs to use both hands to read the data consciously, which makes our original service idea impossible. Implementation.†Lin Wei, technical director of inWatch, said with regret.
However, there is also good news. Wang Sheng revealed at a small press conference that ADI will soon launch a one-handed physiological potential measurement method. Moreover, he pointed out that there are many technical challenges for the current two-handed potential method, such as power consumption, size, and signal chain adjustment and algorithm. "In which, solving the baseline drift is a problem, which is a key consideration in system design. He believes that regardless of the electrode type or the photoelectric type, the sensor itself is very simple, the latter circuit is the key, and the core of the competition is in the signal adjustment and application algorithm part. “ADI has a variety of business models that can provide chips directly to customers, customers design their own hardware, software and algorithms. They also work with third-party IDHs (independent design companies), and customers directly adopt their solutions. These IDHs are in ECG, Heart rate and other medical and health fields have more than a decade of algorithm accumulation." He explained that ADI's analog front end has done a lot of adjustment circuits, which is extremely burden-reliant for the back end, so the requirements for the main chip are not high. The main chip can be used by ADI or by the customer. The products that ADI currently demonstrates to customers are based on ADI's own M3 core-based processor.
Compared with ADI, Shennian's products are basically Turnkey. "Users can basically use it. We not only provide algorithms, but also have good cooperation with Zhongwei Laikang, a third-party remote heart service provider. Customers who use our chips can use the services of Zhongwei Laikang." Zhang Wei said. At the same time, he also revealed that "Shen Nian Technology is developing a new one-handed heart rate solution, which will soon be released." He did not say what the way is. From his mysterious tone, he guessed it should be a one-handed electrode solution.
What physiological measurement technology does Apple iWatch use?
Ok, now I have to go back to the issues that everyone cares the most. What kind of technology will iWatch use? Because Apple undoubtedly has a trend-oriented position, its measurement method is too important for followers. Chang Xu’s biggest news broke out here. According to a friend in the supply chain, iWatch is a photoelectric sensor on the drawing. . . This is also very logical: because the current photoelectric type can achieve one-handed measurement, which can be realistic and remote monitoring, which is consistent with Apple's trend of healthy big data. Therefore, the main function of this year's iWatch should be heart rate monitoring and blood oxygen monitoring. I am afraid that ECG measurement is still not possible.
As for the blood sugar measurement problem that everyone cares about, will iWatch have it? Because of the online news, Apple digs into the blood glucose monitoring solution developer C8 MediSensors technical director Uyen Bullock and sensor company Senseonics hardware development vice president Todd Whitehurst. Both companies have developed technologies and products that non-invasively detect blood sugar.
In this regard, Wang Sheng's analysis is: "The detection of blood sugar is still invasive, and the data of non-invasive measurement is not accurate. The reference is of little significance. Because people who have the need to test blood sugar are more or less present. People in this area need accurate data. From the global progress, blood sugar testing has no consumer-grade products, and they are professional-grade products."
At present, there are not many photosensor solutions that can be mature and suitable for smart watches. Of course, there are many traditional photoelectric sensors, but in smart watches, there is a need for overall improvements in volume, power consumption, signal conditioning, and algorithms. The two companies mentioned above will launch optoelectronic measurement solutions, and Silicon Labs announced the launch of the industry's first single-chip digital ultraviolet (UV) index light sensor IC for smartphones and wearables, except for measuring UV light. In addition to strength, heart/pulse rate and oxygen saturation can also be measured. And the product is ready to provide samples, the price of 10,000 pieces from the purchase price, starting from $ 1.10.
We make 14.8v battery packs for heated jacket, milwaukee heated jacket, dewalt heated jacket, heated motorcycle clothing, heated coat, milwaukee jacket, electric jacket, battery operated jacket, warm cloth, heated motorcycle gear, ravean heated clothing, heated blanket, electric blanket, heated throw, electric throw blanket, dual control electric blanket, cordless heated blanket, electric overblanket, powerblanket, electric under blanket, portable heated blanket.
capacity from 2200mah to 10Ah, 20Ah, 30Ah.
15V Heated Blanket Battery,Electric Blanket Battery, Heated Blanket Battery,Heating Pad Battery
Asarke Industry Co., Limited , https://www.asarke-industry.com