Browsing by Subject "medical device"

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    Finite Element Simulation and Analysis of Drop Tests to Improve the Mechanical Design of a Handheld QSTM Medical Device
    (ASME, 2022-10-30) Bhattacharjee, Abhinaba; Loghmani, M. Terry; Anwar, Sohel; Electrical and Computer Engineering, School of Engineering and Technology
    The structural integrity of an electro-mechanical assembly significantly determines the robustness of the design and durability of a product. Handheld portable medical devices require more attention on their compactness and packaging to ensure design fidelity for manufacturing and avoid permanent damages during inevitable drops or rough handling in a clinical setup. Hence, a finite element analysis is performed for quality conservation, risk assessment, and design failure mode error analysis. This paper investigates the mechanical impacts of drop tests on a handheld portable mechatronic medical device used to quantify real-time dispersive force-motion patterns in the form of Quantifiable Soft Tissue Manipulation (QSTM) for therapeutic massage, clinical manual therapy, and pain level assessments against neuro-musculoskeletal conditions. Structural analysis of the handheld medical device’s mechanical design and assembly has been performed by finite element methods to identify parts of assembly susceptible to maximum stress and deformation during static impact loading and impacts of collisions at drop test simulations. The CAD model of the medical device is illustrated and evaluated with material modeling and structural analysis to distinguish weaker supports and further reinforce them with modified design iterations. This analysis enabled a revised design of the QSTM device which showed significant reduction in stresses and deformations as compared to the baseline design.
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    Towards Development of Smart Nanosensor System To Detect of Hypoglycemia From Breath
    (2020-05) Thakur, Sanskar S.; Agarwal, Mangilal; Tovar, Andres; Anwar, Sohel
    The link between volatile organic compounds (VOCs) from breath and various diseases and specific conditions has been identified since long by the researchers. Canine studies and breath sample analysis on Gas chromatography/ Mass Spectroscopy has proven that there are VOCs in the breath that can detect and potentially predict hypoglycemia. This project aims at developing a smart nanosensor system to detect hypoglycemia from human breath. The sensor system comprises of 1-Mercapto-(triethylene glycol) methyl ether functionalized goldnanoparticle (EGNPs) sensors coated with polyetherimide (PEI) and poly(vinylidene fluoride -hexafluoropropylene) (PVDF-HFP) and polymer composite sensor made from PVDF-HFP-Carbon Black (PVDF-HFP/CB), an interface circuit that performs signal conditioning and amplification, and a microcontroller with Bluetooth Low Energy (BLE) to control the interface circuit and communicate with an external personal digital assistant. The sensors were fabricated and tested with 5 VOCs in dry air and simulated breath (a mixture of air, small portion of acetone, ethanol at high humidity) to investigate sensitivity and selectivity. The name of the VOCs is not disclosed herein but these VOCs have been identified in-breath and are identified as potential biomarkers for other diseases as well. The sensor hydrophobicity has been studied using contact angle measurement. The GNPs size was verified using Ultra-Violent-Visible (UV-VIS) Spectroscopy. Field Emission Scanning Electron Microscope (FESEM) image is used to show GNPs embedded in the polymer film. The sensors sensitivity increases by more than 400\% in an environment with relative humidity (RH) of 93\% and the sensors show selectivity towards VOCs of interest. The interface circuit was designed on Eagle PCB and was fabricated using a two-layer PCB. The fabricated interface circuit was simulated with variable resistance and was verified with experiments. The system is also tested at different power source voltages and it was found that the system performance is optimum at more than 5 volts. The sensor fabrication, testing methods, and results are presented and discussed along with interface circuit design, fabrication, and characterization.