The Experts below are selected from a list of 4620 Experts worldwide ranked by ideXlab platform
Mehmet Rasit Yuce - One of the best experts on this subject based on the ideXlab platform.
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A Wireless Implantable Sensor Design With Subcutaneous Energy Harvesting for Long-Term IoT Healthcare Applications
IEEE Access, 2018Co-Authors: Taiyang Wu, Jean-michel Redoute, Mehmet Rasit YuceAbstract:© 2018 IEEE. In this paper, a wireless Implantable Sensor prototype with subcutaneous solar energy harvesting is proposed. To evaluate the performance of a flexible solar panel under skin, ex-vivo experiments are conducted under natural sunlight and artificial light sources. The results show that the solar panel covered by a 3 mm thick porcine flap can output tens of microWatts to a few milliWatts depending on the light conditions. The subcutaneous solar energy harvester is tested on different body parts, which suggests the optimal position for the harvester to implant is between neck and shoulder. A wireless Implantable system powered by the subcutaneous energy harvester is presented, which consists of a power management circuit, a temperature Sensor, and a Bluetooth low energy module. An application is developed for data visualization on mobile devices, which can be a gateway for future IoT-based healthcare applications. The entire device is embedded in a transparent silicone housing (38 mm × 32 mm × 4 mm), including a 7 mAh rechargeable battery for energy storage. The average power consumption of the implants is about 30 μW in a 10 min operation cycle. With the subcutaneous solar energy harvester, the self-powered operation of the Implantable Sensor prototype is demonstrated by long-term experimental results. Two worst-case scenarios (no exposure to light and battery depletion) are considered with ex-vivo experiment simulations.
Julio A. Cordioli - One of the best experts on this subject based on the ideXlab platform.
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On the design of a MEMS piezoelectric accelerometer coupled to the middle ear as an Implantable Sensor for hearing devices
Scientific Reports, 2018Co-Authors: A. L. Gesing, F. D. P. Alves, S Paul, Julio A. CordioliAbstract:The presence of external elements is a major limitation of current hearing aids and cochlear implants, as they lead to discomfort and inconvenience. Totally Implantable hearing devices have been proposed as a solution to mitigate these constraints, which has led to challenges in designing Implantable Sensors. This work presents a feasibility analysis of a MEMS piezoelectric accelerometer coupled to the ossicular chain as an alternative Sensor. The main requirements of the Sensor include small size, low internal noise, low power consumption, and large bandwidth. Different designs of MEMS piezoelectric accelerometers were modeled using Finite Element (FE) method, as well as optimized for high net charge sensitivity. The best design, a 2 × 2 mm^2 annular configuration with a 500 nm thick Aluminum Nitride (AlN) layer was selected for fabrication. The prototype was characterized, and its charge sensitivity and spectral acceleration noise were found to be with good agreement to the FE model predictions. Weak coupling between a middle ear FE model and the prototype was considered, resulting in equivalent input noise (EIN) lower than 60 dB sound pressure level between 600 Hz and 10 kHz. These results are an encouraging proof of concept for the development of MEMS piezoelectric accelerometers as Implantable Sensors for hearing devices.
Taiyang Wu - One of the best experts on this subject based on the ideXlab platform.
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A Wireless Implantable Sensor Design With Subcutaneous Energy Harvesting for Long-Term IoT Healthcare Applications
IEEE Access, 2018Co-Authors: Taiyang Wu, Jean-michel Redoute, Mehmet Rasit YuceAbstract:© 2018 IEEE. In this paper, a wireless Implantable Sensor prototype with subcutaneous solar energy harvesting is proposed. To evaluate the performance of a flexible solar panel under skin, ex-vivo experiments are conducted under natural sunlight and artificial light sources. The results show that the solar panel covered by a 3 mm thick porcine flap can output tens of microWatts to a few milliWatts depending on the light conditions. The subcutaneous solar energy harvester is tested on different body parts, which suggests the optimal position for the harvester to implant is between neck and shoulder. A wireless Implantable system powered by the subcutaneous energy harvester is presented, which consists of a power management circuit, a temperature Sensor, and a Bluetooth low energy module. An application is developed for data visualization on mobile devices, which can be a gateway for future IoT-based healthcare applications. The entire device is embedded in a transparent silicone housing (38 mm × 32 mm × 4 mm), including a 7 mAh rechargeable battery for energy storage. The average power consumption of the implants is about 30 μW in a 10 min operation cycle. With the subcutaneous solar energy harvester, the self-powered operation of the Implantable Sensor prototype is demonstrated by long-term experimental results. Two worst-case scenarios (no exposure to light and battery depletion) are considered with ex-vivo experiment simulations.
D Etzrodt - One of the best experts on this subject based on the ideXlab platform.
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low power integrated pressure Sensor system for medical applications
Sensors and Actuators A-physical, 1999Co-Authors: C Hierold, B Clasbrummel, D Behrend, Thomas Scheiter, Max Steger, Klausguenter Oppermann, Hergen Kapels, E Landgraf, D Wenzel, D EtzrodtAbstract:Abstract A new low power integrated pressure Sensor system with digital output (1 bit PDM signal) for medical applications is presented. The absolute pressure Sensor comprising 400 nm thick surface micromachined polysilicon membranes for capacitive pressure detection and a monolithic integrated 2nd order sigma–delta-modulator including voltage reference and timing generator is extremely miniaturized on an area of approximately 3 mm 2 . For protection and biocompatibility reasons the Sensor is coated with a silicone elastomer of up to 100 μm thickness, which does not influence the Sensor's performance. The Sensor system was tested in vitro in physiological NaCl solution, showing excellent results compared to a commercial available reference Sensor. The Sensor system is working well down to a supply voltage of 2.2 V with a power consumption of 0.5 mW. The resolution is better than 12 bit. Due to the small chip area, low power consumption and cost effective production process, the Sensor is ideal for medical applications, e.g., in combination with telemetric power and data transmission [J. Zacheja, B. Clasbrummel, J. Binder, U. Steinau, Implantable Telemetric Endosystem for Minimal Invasive Pressure Measurements, MedTech95, Berlin, Germany, (1995)] as an Implantable Sensor to reduce the mortality risk of intensive care patients.
A. L. Gesing - One of the best experts on this subject based on the ideXlab platform.
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On the design of a MEMS piezoelectric accelerometer coupled to the middle ear as an Implantable Sensor for hearing devices
Scientific Reports, 2018Co-Authors: A. L. Gesing, F. D. P. Alves, S Paul, Julio A. CordioliAbstract:The presence of external elements is a major limitation of current hearing aids and cochlear implants, as they lead to discomfort and inconvenience. Totally Implantable hearing devices have been proposed as a solution to mitigate these constraints, which has led to challenges in designing Implantable Sensors. This work presents a feasibility analysis of a MEMS piezoelectric accelerometer coupled to the ossicular chain as an alternative Sensor. The main requirements of the Sensor include small size, low internal noise, low power consumption, and large bandwidth. Different designs of MEMS piezoelectric accelerometers were modeled using Finite Element (FE) method, as well as optimized for high net charge sensitivity. The best design, a 2 × 2 mm^2 annular configuration with a 500 nm thick Aluminum Nitride (AlN) layer was selected for fabrication. The prototype was characterized, and its charge sensitivity and spectral acceleration noise were found to be with good agreement to the FE model predictions. Weak coupling between a middle ear FE model and the prototype was considered, resulting in equivalent input noise (EIN) lower than 60 dB sound pressure level between 600 Hz and 10 kHz. These results are an encouraging proof of concept for the development of MEMS piezoelectric accelerometers as Implantable Sensors for hearing devices.
