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• W2284164965 abstract "Research Doctorate - Doctor of Philosophy (PhD)%%%%Ageing populations in the developed world are perhaps one of the greatest concerns for providing quality healthcare in the future. Medical professionals are dependent on non-biological technology in order to understand how the human body works. Electronics has been a relatively recent area of science, and it has seen an escalating rate of sophistication. The body’s nervous system operates by using electrical signals, and from an engineering perspective the bodys organs behave as sensors and transducers. The ability to monitor vital health indicators such as the electrocardiogram (ECG), body temperature and blood pressure information via medical telemetry may offer adequate tools to view the logged or real time data of vulnerable patients, especially the elderly. Miniaturising this technology will also open new opportunities to access more biological information. Growing telecommunications infrastructure with increasing sophistication is opening the possibilities with regards to medical telemetry, making it theoretically possible for patients to carry out their daily tasks while being remotely monitored by doctors. Implantable electronics have become a topic of considerable research, with the implementation of the Cochlear implant and more recently Retinal prosthesis, in addition to telemetry devices. Implantable telemetry is also used in biomedical research to identify the physiological activity of animal subjects in confined laboratory environments. This dissertation presents new techniques in data and power transfer applied to implantable devices in the body. In particular it studies high frequency inductive links to reduce the size of implantable devices. It introduces the concept of Class-E oscillators, which combines Class-E amplifiers commonly used in inductive power transfer links, with oscillators, increasing the overall efficiency of the wireless power transmitter. A multi-array technique is implemented in power-transmitting coils to provide continuous wireless power to implants despite movements by laboratory animals in an enclosed environment. At the implant site, this thesis presents stacking techniques for power-receiving coils in order to increase the efficiency and reduce the physical size of the implanted power coil. An antenna has been implemented to transmit data from the implant to a site external to the body while the implant is loaded in tissue. A unique type of implant architecture is also proposed which generates harmonic signals, one harmonic of which forms the data carrier frequency thus avoiding the need for an oscillator block in the implant. The supply of power to implants may not always be conducted with a battery, and much effort has been committed to investigate ways of transmitting power wirelessly, mainly with inductive links. Switching power amplifiers, in particular Class-E amplifiers, are known for operating efficiently at high frequencies. This thesis will offer a simple way to analyse and design Class-E amplifiers using second…" @default.
• W2284164965 created "2016-06-24" @default.
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• W2284164965 date "2011-01-01" @default.
• W2284164965 modified "2023-09-27" @default.
• W2284164965 title "Implantable microelectronics for biological signals" @default.
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