1,721,101 research outputs found
Device implantable in biological ducts
No full textMedical device (200) that can be implanted in biological ducts in the human body having simultaneous functionalities of mechanical aid for biological ducts, sensor of the state of obstruction of the duct, radio transmitter and data storage unit. The device is made of biocompatible metal alloys and one or more microchips for radio- frequency identification (RFID) provided with a memory, able to monitor its own degree of endothelialization, detect the presence and the evolution of stenotic processes as well as locate the device, recognize it, evaluate its structural integrity and transmit the information collected to a suitable external reader by means of reflection of the electromagnetic field emitted by said external interrogator. The functionalities of the device further permit tracing of the entire history of the device and of the patient's medical data
Monolithic Antenna Array for Epidermal 5G Backscattering Communications
No full text5G network is expected to sensibly boost the diffusion of personal area networks for health and wellness monitoring purposes, especially with regard to battery-less devices and backscattering based communications. To overcome the power path-loss, however, high efficiency radiating elements are mandatory, especially for the highest frequencies. Here, the feasibility of adopting monolithic grid antenna arrays directly adhering onto the human skin is investigated. Numerical parametric analysis are performed to evaluate the backscattering link budget of the proposed epidermal devices and to derive their upper-bound performances. Early results demonstrate the reasonability of the approach and the possibility to reach communication distances ranging from 20 cm to 1 m in case of sub-grid structures are adopted
Pervasive body sensing: Implanted RFID tags for vascular monitoring
No full textRadio Frequency Identification (RFID) technology, one of the most innovative and promising applications is the possibility to process the backscattering signals to detect additional information about the target, such as its state and its evolution, without any specific embedded sensor or local power supply
Sensing the human body by implanted RFID tags
No full textStarting from the physical evidence that passive RFID systems may be used as self-sensing devices, the feasibility of human monitoring by means of implanted tags is here investigated. The sensing capabilities, the backscattering contrast and the communication link are analyzed considering a specific medical application, i.e. the continuous monitoring of brain edema evolution in patients neurosurgery treated. By using numerical simulations all the significant issues of the passive sensing are here investigated at different frequency bands. Preliminary experimental results with simplified phantoms corroborate the analysis
Precision and Accuracy in UHF-RFID Power Measurements for Passive Sensing
No full textIn spite of analog radio frequency identifica- tion (RFID) sensors are gaining increasing attention from acad- emic and industrial domains, their true applicability in the real world is still in question, since it is not clear whether and in which conditions the variation of the measured signals related to the sensing activity may be distinguished from the measurement uncertainties. The RFID platform for analog sensing, namely, with no dedicated sensing electronics, is here characterized in term of precision and accuracy with reference to the arrangement and the reproducibility of the setup. Numerical analysis and laboratory experimentations demonstrated that the precision of power metrics measurement is twice the resolution of low- cost readers and that the uncertainty on the distance and the alignment may play a major role on the data accuracy. The environment-independent indicator, such as the analog identifier, revealed once again to be a very stable and robust metric. In overall, the obtained results suggest that analog RFID devices can be used as indicative sensing platform to identify a few levels of the phenomenon under observation. The sensing granularity can be improved using low-power ICs, while classification algorithms could be applied to increase the robustness of the detection
Sensing the human body by implanted RFID tags
No full textStarting from the physical evidence that passive RFID systems may be used as self-sensing devices, the feasibility of human monitoring by means of implanted tags is here investigated. The sensing capabilities, the backscattering contrast and the communication link are analyzed considering a specific medical application, i.e. the continuous monitoring of brain edema evolution in patients neurosurgery treated. By using numerical simulations all the significant issues of the passive sensing are here investigated at different frequency bands. Preliminary experimental results with simplified phantoms corroborate the analysis
Propagation Modeling Inside the International Space Station for the Automatic Monitoring of Astronauts by Means of Epidermal UHF-RFID Sensors
No full textThe monitoring of Astronaut's health is one of the most impacting aspects of long-duration Space missions, especially for the high involvement required to the crew members in the daily acquisition of body parameters. Automatic procedures based on wireless systems would grant undeniable benefits, especially if lightweight and battery-less devices could be adopted. The possibility and the reliability of a communication link inside the International Space Station (ISS) is here investigated when the UHF-RFID epidermal technology is adopted. A Ray Tracing asymptotic method is hence proposed to evaluate the coverage area and the read probability inside the Harmony module. The analysis is referred to up to two astronauts simultaneously present in the module and to the presence of multiple reader antennas, in case purely passive epidermal tags are adopted. Simulations revealed that it is possible to identify some simple operating conditions that allow to obtain a reliable RFID link, also thanks to the advantageous propagation characteristics of the module itself
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