Browsing by Author "Oyejide, A.J."

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Computational Assessment of Hemodynamics in Asymmetric-Type Lesion of Idealized Coronary Stenoses
(Springer Science and Business Media Deutschland GmbH, 2025) Oyejide, A.J.; Abodunrin, O.D.; Ige, E.O.; Awonusi, A.A.
Purpose: Coronary artery stenosis, characterized by the narrowing of the arterial lumen, significantly alters blood flow and contributes to the progression of cardiovascular diseases. This study investigates the hemodynamic effects of different stenosis morphologies, all maintaining an 80% lumen reduction, to determine how variations in shape influence flow behavior and mechanical stresses. Methods: We employed computational fluid dynamics (CFD) to analyze five idealized stenosis geometries with the following asymmetric and symmetric configurations: C1 (10% and 70%), C2 (20% and 60%), C3 (30% and 50%), C4 (40% and 40%), and C5 (0% and 80%). Using physiological pulsatile flow conditions, we evaluated key hemodynamic parameters, including velocity profiles, wall shear stress, and pressure distribution. Results: Despite having the same degree of lumen reduction, each stenosis configuration produced distinct hemodynamic profiles. Asymmetric stenoses, particularly the C1 and C2 cases, exhibited pronounced flow disturbances, higher wall shear stress at the stenosis throat, and increased post-stenotic turbulence. In contrast, symmetric stenoses, such as C4, demonstrated more uniform flow and reduced vortex formation. These findings suggest that stenosis morphology plays a crucial role in determining local flow dynamics. Conclusion: Our findings challenge the common practice of generalizing results across stenosis configurations without considering morphological variations, which is prevalent in many CFD studies using idealized models. This study emphasizes the need for stenosis-specific assessments in CFD analyses and clinical interpretations to improve the accuracy of diagnostic tools, optimize personalized treatment strategies, and guide the design of medical devices such as stents. © The Author(s), under exclusive licence to The Brazilian Society of Biomedical Engineering 2025.
Electro-Pneumatic Assessment of Airflow in a Double-Piston Cylinder Ventilator
(Institute of Electrical and Electronics Engineers Inc., 2024) Oyejide, A.J.; Atoyebi, E.O.; Ugo, H.C.; Chukwudi, F.O.; Akindel, G.; Adeyemi, A.A.
Mechanical ventilation is crucial for patients with severe respiratory distress. While single piston-actuated ventilation is popular, this study presents an electro-pneumatic assessment of airflow in a coupled-double-acting piston ventilator (DPDACV) using simulation results from FluidSIM. The DPDACV design aims to leverage a dual-piston mechanism for enhanced stability and performance in tidal volume delivery. Simulations conducted over 2, 10, 30, and 60 seconds revealed that the DPDACV provides more consistent volume delivery, stable flow rates, and relatively higher, more stable pressure levels compared to single-piston systems. These findings suggest that the DPDACV can offer improved ventilation efficiency and patient safety, contributing valuable insights to the field of mechanical ventilation. © 2024 IEEE.
A Smart Medication Dispenser for Enhanced Elderly Care
(Nigerian Institution of Professional Engineers and Scientists, 2025) Ugo, H.C.; Akinbiola, A.; Ozoemena, S.; Oyejide, A.J.; Isaac, E.G.
The aging population and prevalence of chronic diseases present significant challenges in medication adherence, especially in resource-limited settings where healthcare resources are scarce. This study aimed to develop a cost-effective smart medication dispenser tailored to the needs of elderly patients in these settings. The device integrates pill and syrup dispensing capabilities, featuring audible alarms, hand-sensor technology, and a communication module for notifications to caregivers and healthcare providers. The dispenser was evaluated through a series of trials to assess its accuracy in dispensing pills and syrups and the performance of its notification and alarm systems. The device achieved high accuracy in pill and syrup dispensation. Notification alerts were timely, with delays ranging from 3 to 10 seconds, and the buzzer system showed consistent performance with an average delay of 1.5 seconds. The smart medication dispenser stands as a promising tool for enhancing medication adherence and ensuring the safety and health of elderly individuals. Its affordability and ease of use make it particularly suitable for resource-limited settings, offering a reliable solution to improve health outcomes and reduce the burden on healthcare systems. © 2025 NIPES Pub.