Breaking the "useless functions" of smart wearable devices, ADI's vital sign signal monitoring technology helps realize "health monitoring"
Latest update time：2019-08-09
Reads：
According to the latest data released by IDC, the global shipments of wearable devices in Q1 2019 reached 49.6 million units, and the shipments of China's wearable device market reached 19.5 million units, which has grown into the world's largest smart wearable market. The demand for smart wearable devices in China is growing rapidly, and the realization of the "health monitoring" function that consumers most expect faces many pain points in design. Recently, at
the 2019 Smart Wearable Health Monitoring Electronic Technology Forum Summit
,
ADI China Medical Market Director Peng Zhifeng
and
Field Application Engineer Jack Wu
explained in detail how ADI's leading vital sign signal monitoring technology can solve the challenges in the design of smart wearable devices.
How to solve the design and functional pain points of smart wearable devices?
-
Vital sign signal monitoring
-
Therapeutic products
-
Physiotherapy products
The so-called vital sign signal detection, for example, wearable devices monitor blood sugar, intelligently measure blood pressure and monitor ECG, etc. At present, most domestic wearable device manufacturers focus on this field, which is relatively simple to implement and belongs to the second category of medical devices or pure consumer electronics products. The wearable device function that patients expect most is health monitoring, and there is still a long way to go before it can be truly implemented. In Peng Zhifeng's view, in order to spread smart wearables from a small group of trendy people to most consumers, and from purely cool toys to national-level applications that meet the rigid needs of consumers, it is necessary to
realize medical-level vital sign signal monitoring and judgment on wearable devices,
so
truly sink these applications to the third and fourth-tier user groups.
Health sign monitoring is the key to the rapid growth of the wearable industry. Looking at the current state of the industry, the wearable product industry is almost all driven by the demand for monitoring vital signs, including bracelets, watches, smart shoes, and clothing. Health functions are indispensable. The health signs detected by wearable devices include blood pressure, blood oxygen, exercise, body fat, body temperature, exercise status, and respiratory monitoring. More and more indicators have enriched the collection of vital signs. To
collect and process specific signal indicators in wearable devices, it is necessary to use the latest sensors, analog mixed signal processing, and corresponding digital processing algorithms.
ADI can provide a complete ecological chain solution from the initial sensor to the signal processing signal chain (AD/DA), signal communication, to the final algorithm (through ADI's ecosystem partner cooperation).
Application of vital sign signal monitoring in wearable devices
ADI Mobile Medical Symptom Monitoring Solution
In addition, Peng Zhifeng also pointed out that when using wearable devices to measure physiological signs by photoelectric method, ambient light interference is a big problem, and the impact on photoelectric measurement cannot be ignored. For example, indoor lighting and outdoor daylight will affect the accuracy and reliability of measurement. The internal circuit and unique optical path design of ADI's photoelectric acquisition solution can effectively suppress external ambient light interference, greatly improving the accuracy of measurement.
ADPD188GG
, as ADI's latest complete photoelectric measurement module in mass production, integrates a high-efficiency photoelectric measurement front end, two LEDs and two photodiodes (PD), and can provide the best ambient light interference suppression performance among similar products. All these devices are packaged in a compact package with a thickness of only 0.9mm, which greatly saves the stacking space of devices for wearable devices. Its optimized optical structure prevents the light of the LED from being directly reflected to the photodiode without entering the object being measured, thereby suppressing internal light pollution. Its dual PD design can further optimize the flexibility and reliability of wear detection.
Unlocking all symptom monitoring technologies, ADI comprehensively deploys the signal chain of the wearable medical market
In addition to the above-mentioned photoelectric measurement, the main technology for collecting and processing vital signs signals is to start from impedance, physiological potential, body temperature, movement and environment. ADI currently has a series of products that support a variety of portable healthcare applications. For example, to meet the specific low power consumption, small size and low cost requirements of power management in wearable devices, ADI's specially designed chips such as
ADP5061/5
,
ADP150
,
ADP160
, etc. have performed well in the wearable market. Especially in the measurement of physiological vital signs signals by photoelectric method, ADI's ADPD series sensors and signal processing solutions are being designed and used by almost all major brand customers.
According to Jack Wu, ADI's latest generation of high-performance multi-mode sensing front-end
ADPD4000 series
is mainly used for the functional design of wearable products, and can realize measurements such as PPG, blood oxygen, ECG, impedance, and body temperature. It can operate as a complete multi-mode sensor front end, thereby stimulating up to eight LEDs and measuring the return signal on up to eight separate current inputs. The ADPD4000 series provides twelve time-division multiplexed sampling time slots, each of which supports the measurement of 1 parameter/function. The data output and function configuration use a serial interface (SPI/I2C), which can flexibly configure the LED and synchronous detection functions. At the same time, the ADPD4000 can also suppress signal offset caused by interference from asynchronously modulated optical signals without the use of optical filters or externally controlled DC elimination circuits. It provides a variety of operating modes and can be used as analog-to-digital conversion for analog quantities such as photodiodes, biopotential electrodes, resistors, capacitors, and temperature sensors.
For physiological potential & impedance measurement, the most mature application is measuring respiration and electrocardiogram (ECG). Jack mentioned that ADI provides two ECG solutions: single-lead and multi-lead. The single-lead ADI heart rate monitor analog front end
AD8233
, which has the advantage of cost performance, has been valued and applied by many ECG bracelet and ECG chest patch manufacturers due to its ultra-small size and ultra-low power consumption. For the corresponding multi-lead solution, ADI's other highly integrated
ADAS1000
integrates multi-lead ECG, respiration and pacing signal detection functions, and is the preferred solution for high-performance diagnostic-level ECG monitoring.
ADI's main products for physiological potential measurement
In addition, continuous non-invasive blood pressure (CNIBP) measurement is a technology for monitoring human blood pressure in real time or at short time intervals. ADI also provides a large number of highly integrated PPG AFE, ECG AFE, low-power MCU, power management and other solutions to optimize the product quality and reliability of wearable CNIBP applications.
Summarize
The product upgrade of smart wearable devices requires fast follow-up of market and consumer (including patient) demands. The product upgrade is short, flat and fast, and complete or nearly complete solutions are what customers need. Therefore, how to integrate power supply, wireless transmission and other complete signal chains based on ADI's strongest signal conditioning and signal processing capabilities, and launch modules or even complete system-level solutions are the top priorities for ADI's layout of mobile medical care.
"ADI starts from the perspective of the signal chain, covering the entire signal chain from signal acquisition of front-end sensors, ADC conditioning, MCU/CPU data processing, wireless transmission to the cloud, and power and energy collection. ADI even collaborates with customers and partners to provide corresponding software algorithms and cloud processing solutions, and is committed to providing system-level solutions. In
addition, ADI also has a dedicated team that provides evaluation boards, simulation tools, application expertise, and corresponding algorithm research, which can provide all-round support for customers' design and development work.
" Jack emphasized.
ADI's products and technologies in the field of healthcare applications are certainly not limited to this. If you want to learn more, click " Read More "~
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