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One study found that a wireless device that uses an improved, rather than primitive, near-field electromagnetic energy transmission technology may provide a method of powering micro-medical electronic devices implanted in the body. Advances in engineering have made medical electronic implant devices possible, but the method of powering these implants has not kept pace with the pace of development of the devices.
John S. Ho and his colleagues used a technique called midfield power to study an alternative approach to traditional near-field wireless power transmission that is limited by the size of the implant, which can theoretically cover small However, implanted deeper medical electronic devices.
The researchers designed a patterned electromagnetic metal disk that, when placed near a pig's tissue, transmitted up to 2000 microwatts of power to the heart or brain through 5 centimeters of tissue. Traditional pacemakers require 8 microwatts of power, and this is only a small fraction of the power generated by such an electrical disk. An experiment performed on a rabbit demonstrated the ability of the tray to implant an electrical stimulator on the surface of the heart to a depth of 4.5 cm, thereby making it possible to regulate the heart rate of the rabbit. This level of disk transmission energy is below the limits of human safety, and the pattern of this disk surface allows the electromagnetic field to focus on small areas near these miniature implants.
The researchers said that these results demonstrate that a midfield wireless device may safely power or charge miniature implants through different types of tissue.
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