South Korea develops new medical device charging material'Micro LED patch, or it will alleviate the pain point of frequent replacement of batteries for implantable medical devices
Professor Lee Jong-ho of the Mechanical Engineering Department of Gwangju Institute of Science and Technology (GIST) in South Korea said on the 7th that his research team has developed a "Micro LED patch" that is attached to the skin and can supply electricity to the body. This is expected to be used in implantable medical and health equipment, and wearable beauty equipment directly attached to the skin.
(Source: Bing)
Pacemaker is an implantable electronic medical device for treating cardiac dysfunctions such as arrhythmia and heart failure. The pulse generator delivers electrical pulses provided by the battery. However, many implantable medical devices, including cardiac pacemakers, are powered by lithium batteries, which are bulky, hard, bulky, and short-lived. Every time the battery needs to be replaced, the patient will suffer the pain of the operation again, which is still a big expense.
In order to solve the heavy battery problem of implantable medical devices, academia is studying ways to use human bioelectricity to operate devices. However, due to the very limited bioelectricity in our body, this concept has obvious limitations at the practical level.
As early as 2016, Professor Li Zhonghao's research team developed a "subcutaneous solar panel" implanted under the skin to provide energy by absorbing sunlight to generate electricity, but this still has fatal flaws-indoors, at night, in clothes In a low-light environment, the battery board cannot produce enough power.
In order to perfect this design, the "Micro LED patch" equipped with red LEDs used in conjunction with the "subcutaneous solar panel" came into being, adopting the method of generating electricity.
(Source: Naver)
The red light and the near-infrared light (wavelength above 650 nanometers) have strong penetrating power when facing body tissues, and can pass through the body tissues to reach the solar panel installed on the medical device.
(Source: Naver)
Using this feature, the research team developed a "Micro LED patch" that emits red light (wavelength of 670 nanometers). The solar cell stimulated by the red light generates photoelectricity and supplies it to hungry medical devices. Therefore, whether it is cloudy, indoor or night, the medical devices in the body can obtain sufficient energy to maintain normal work. This will greatly extend the life of medical devices and reduce patient inconvenience.
In order to solve the problem of foreign body sensation, burns and sweat that may occur when attached to the skin, the researchers designed connecting lines and sweat holes on the thin patch to enhance softness and breathability. In addition, the research team directly stitched and embedded the thin-film Micro LED with a thickness of 4 microns on the heat dissipation device, so as to ensure that the heat generated by the electronic products can be effectively removed.
(Source: Naver)
It is reported that the patch can be attached to any skin at will, and it is effortless to remove and reapply. The patch is repeatedly folded and bent in a circle with a radius of 3 mm and will not break. The temperature when it is attached to the skin is kept below 41.2°C, and is stable within the low-temperature scald benchmark (less than 44°C within 6 hours).
The researchers observed through the experimental mice that the LED patch attached to the skin can provide 8.2 microwatts of electricity for a small area (0.11 square centimeter) solar cell implanted under the skin, which can smoothly drive the heart pacing Device (power consumption is about 1 ~ 10 microwatts), to perform periodic current stimulation to treat diseases such as arrhythmia.
The development of medical technology has greatly improved human body functions and created hope for fragile lives. In recent years, research results on implantable and wearable medical devices have continuously appeared at home and abroad.
It is reported that in 2019, the international academic journal Nature-Communication introduced Li Zhou, a researcher at the Beijing Institute of Nano Energy and Systems, Chinese Academy of Sciences, and Wang Zhonglin, a foreign academician of the Chinese Academy of Sciences, and their team through the research and development of a new friction nano-generator. A self-driving cardiac pacemaker does not require batteries for energy supply, and can collect sufficient energy only from the heart beat.
"With light as a medium, although simple, it can achieve the purpose of supplying power at any time. Professor Li Zhonghao said that he expects it to contribute to the development of a variety of healthcare technologies.
The research results were published in the American Academy of Sciences (PNAS).
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