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Influence of the surface free energy of liquids and the liquid distribution on the friction of paper wipers

Friction 2025年第3期13卷 187-195页

作者： Toshiaki Nishi Takeshi Yamaguchi Graduate School of Engineering Tohoku UniversitySendai 980-8579Japan Graduate School of Biomedical Engineering Tohoku UniversitySendai 980-8579Japan

Various soft materials,e.g.,papers,cloths,and sponges,can absorb *** this study,we demonstrated the influence of the surface free energy of liquid and the liquid distribution on the friction behavior of a paper wiper on a glass *** friction test was performed by varying the liquid content in the paper *** with the dry condition,the friction coefficient increased 5.14 times when a certain part of the interface was occupied with *** found that this high friction effect decreased with the surface free energy of the liquid,and the contact between the liquid droplets in the paper wiper and the glass plate was required to realize a high friction *** high friction effect is observed for paper wipers and other soft materials that can absorb liquids,e.g.,cloths and sponges,and the findings of this study are expected to help design the friction properties of soft materials containing small amounts of liquid.

关键词： paper wiper friction water content nonuniform wetting

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An Experimental Study on Beat-by-Beat Blood Pressure Monitoring Based on Wrist Sphygmomanometer

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Transactions of the Korean Institute of Electrical Engineers 2024年第9期73卷 1568-1573页

作者： Kim, Dong-Gue Cho, Jaegeol Dept. of Biomedical Engineering Soonchunhyang University Korea Republic of Dept. of Biomedical Engineering Graduate School of Soonchunhyang University Korea Republic of

In hospitals, continuous blood pressure is measured by inserting of a catheter into a blood vessel, which is an accurate technique, but leads to damaged blood vessels. To address this drawback, the Volume-Clamping method was introduced as an alternative approach for non-invasive and continuous blood pressure measurement. However, this approach employs complex PID control algorithms for finger cuff, leading to high costs and bulky apparatus. Therefore, we propose a beat-by-beat blood pressure monitoring system in the form of a wrist sphygmomanometer, wherein the pressure-volume relationship of the radial artery is determined through oscillometric measurements. Beat-by-beat blood pressures are estimated based on the artery pressure-volume relationship and artery volume variations obtained from the wrist cuff. Research findings indicate that the errors in systolic and diastolic blood pressure are -3.4 ± 7.6[mmHg], -3.7 ± 5.3[mmHg] respectively, meeting the standards set by the Association for the Advancement of Medical Instrumentation(AAMI). This system has the potential to be reproduced using a simple mechanism involving a solenoid valve, transforming it into a wrist blood pressure sphygmomanometer that offers convenient blood pressure monitoring not only within medical facilities but also in daily life. Copyright © The Korean Institute of Electrical Engineers.

关键词： Solenoid valves

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The development of video laryngoscope via additive manufacturing for use in a pre-hospital environment

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Research on biomedical engineering 2024年第1期40卷 15-23页

作者： Alves, Marcio Allan Foggiatto, Jose Aguiomar Berti, Lucas Freitas Ulbricht, Leandra Graduate Program in Biomedical Engineering Universidade Federal Tecnológica do Paraná Curitiba Brazil Graduate Program in Mechanical and Materials Engineering Universidade Federal Tecnológica do Paraná Curitiba Brazil

Purpose: Due to failures that occur during intubation, some authors advocate that intubation should always be done with a video laryngoscope. What makes the implementation of this recommendation difficult, especially in developing countries, is the high price of the device. Thus, the objective of this study is to present a low-cost video laryngoscope developed via additive manufacturing, being the first device to have the safety parameters duly tested according to the ISO 7673:2020 standard. Methods: A video laryngoscope with a Macintosh-type rigid blade was developed. After modeling it in the CAD-3D SolidWorks® program, the prototype was printed in PLA (polylactic acid), and load and fatigue tests were carried out with the MTS 810/793 testing machine. Results: The main results were an improvement in ergonomics (with a better fixation of the camera wire and camera positioning). Load and fatigue tests showed compliance with the requirements of the ISO 7673:2020 standard. The first is that when subjected to a traction force of 65 N, the center of illumination must not move more than 10 mm (the average movement was only 3.95 mm). The second is that when subjected to a traction force of 150 N, the laryngoscope blade must not break (348 N of load was applied and the piece resisted without breaking). Conclusion: It was shown that the Macintosh-type PLA video laryngoscope has the potential to become a safe and low-cost tool in the emergency intubation arsenal. © The Author(s), under exclusive licence to The Brazilian Society of biomedical engineering 2023.

关键词： 3D printing

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A survey of deep learning methods on cell instance segmentation

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Neural Computing and Applications 2025年第17期37卷 11195-11264页

作者： Wang, Ching-Wei Lee, Wei-Tang Su, Ting-Sheng Graduate Institute of Biomedical Engineering National Taiwan University of Science and Technology Taipei Taiwan

Cell segmentation is a key topic in medical image analysis with a wide range of applications in the study of diagnosis and prognosis of pathology and cytology. Along with the recent development of generative adversarial networks and transformers, there has been a substantial amount of work aimed at developing cell segmentation approaches using deep learning (DL) models. Inspired by this transition, in this survey, we provide a comprehensive review of the current situation and future technology development in cell instance segmentation by systematically reviewing 198 research papers, covering a broad spectrum of models for instance-level cell segmentation from 2020 to 2024, including convolutional networks, encoder–decoder architectures, recurrent networks, transformers and generative adversarial models. We have examined the loss functions, training strategies, evaluation methods, widely used datasets and quantitative performance of individual methods. A comprehensive summary of the selected seminal works on DL-based cell segmentation with microscopic images is further provided to investigate the effectiveness of methods. We have also performed a comparative analysis on two challenging cell instance segmentation datasets with technical challenges, including unclear cell boundaries, clustered or overlapping cells, variations in cell appearance and sparse or missing annotations, utilizing 18 state-of-the-art DL approaches in cell instance segmentation. Finally, we described the strengths and challenges of the cell instance segmentation models with discussions on future research directions in this area. © The Author(s) 2025.

关键词： Image segmentation

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Features of Computerized Systems for the Management of Medical-Hospital Equipment in Clinical engineering Departments in Brazil 9th

Features of Computerized Systems for the Management of Medic...

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9th Latin American Congress on biomedical engineering, CLAIB 2022 and 28th Brazilian Congress on biomedical engineering, CBEB 2022

作者： Rosa, Perseu Filho Barros, Frieda Saicla Graduate Program in Biomedical Engineering Federal Technological University of Paraná Curitiba Brazil

ISBN: (纸本)9783031494093

The rapid evolution and complexity of medical-hospital equipment (EMH), as well as the appearance of adverse events that had not occurred until then, resulted, in the United States, in the emergence of the area of activity called Clinical engineering (CE). In Brazil, although the profession does not have its proper recognition and regulation, the need for a qualified and designated professional to manage health technologies, within a Health Care Facility (EAS), has been increasingly evident. To manage these technologies, in addition to being mandatory, is the responsibility of each Hospital, requiring dedication and control. The use of computerized systems (SI), aiming at successful management of health technologies, including the preparation of inventories and control of technical intervention events (e.g., maintenance), has been consolidated. Despite having available in the market diversified software intended for the realization of maintenance management, notoriously, the foundation, structuring and functionality of these, are convergent. The present work aimed to list, through bibliographic references, parameters and essential functions, which should make up an SI for the management of EMH, applied in the Departments of CE in Hospital Units. Thus, through the study carried out, it was observed that a software for this purpose can be divided into four main modules: Module of registrations, EMH inventory, service orders (maintenance) and, reports/indicators. Finally, given the functionalities identified in the analyzed SI, it is suggested to conduct new studies related to the incorporation of specific tools and functionalities, aimed at CE in Brazil. © 2024, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Hospitals

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Multi-component liquid-infused systems:a new approach to functional coatings

Industrial Chemistry & Materials

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Industrial Chemistry & Materials 2024年第3期2卷 378-392页

作者： Zachary Applebee Caitlin Howell Department of Chemical and Biomedical Engineering Maine College of Engineering and ComputingUniversity of MaineME 04469USA Graduate School of Biomedical Science and Engineering University of MaineME 04469USA

Antifouling liquid-infused surfaces have generated interest in multiple fields due to their diverse applications in industry and *** nearly all reports to date,the liquid component consists of only one chemical ***,unlike traditional solid surfaces,the unique nature of liquid surfaces holds the potential for synergistic and even adaptive functionality simply by including additional elements in the liquid *** this work,we explore the concept of multi-component liquid-infused systems,in which the coating liquid consists of a primary liquid and a secondary component or components that provide additional *** ease of understanding,we categorize recently reported multi-component liquid-infused surfaces according to the size of the secondary components:molecular scale,in which the secondary components are molecules;nanoscale,in which they are nanoparticles or their equivalent;and microscale,in which the additional components are micrometer size or *** present examples at each scale,showing how introducing a secondary element into the liquid can result in synergistic effects,such as maintaining a pristine surface while actively modifying the surrounding environment,which are difficult to achieve in other surface *** review highlights the diversity of fabrication methods and provides perspectives on future research *** secondary components into the liquid matrix of liquid-infused surfaces is a promising strategy with significant potential to create a new class of multifunctional materials.

关键词： Active surfaces Antimicrobial Antifouling Interfaces Sensing surfaces

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Room-Temperature and Compressive Force-Free Metal-Metal Direct Bonding for Heterogeneous Integration of Micro-LED Array on 3D-IC

Room-Temperature and Compressive Force-Free Metal-Metal Dire...

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2024 International 3D Systems Integration Conference, 3DIC 2024

作者： Shen, Jiayi Liu, Chang Tanaka, Tetsu Fukushima, Takafumi Dept. Mechanical Systems Engineering Graduate School of Engineering Tohoku University Sendai Japan Dept. of Biomedical Engineering Graduate School of Biomedical Engineering Dept. Mechanical Systems Engineering Graduate School of Engineering Tohoku University Sendai Japan Dept. Mechanical Systems Engineering Graduate School of Engineering Dept. of Biomedical Engineering Graduate School of Biomedical Engineering Tohoku University Sendai Japan

ISBN: (纸本)9798331516505

This paper presents enhanced room-temperature bonding for micro-LEDs tailored to Smart Skin Display applications. While our prior work utilizing a Semi-Additive Plating (SAP) process achieved a micro-LED bonding yield of 90%, further advancements necessitate addressing challenges in sidewall GaN layer insulation deposition and complete seed layer removal. We propose an enhanced SAP (eSAP) process incorporating a novel micro-LED structure and a well-designed Cu seed pattern. Successful illumination of the fabricated micro-LEDs was demonstrated. Furthermore, we investigated the possibility of an advanced SAP (aSAP) with electroless Ni plating, eliminating the need for final seed layer removal, thereby simplifying the process and enhancing reliability. This approach represents a promising solution for room- or low-temperature micro-LED bonding. © 2024 IEEE.

关键词： III-V semiconductors

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Beam Spreading Single-element Ultrasonic Blood Vessel Diameter Sensor Considering Displacement

Transactions of Japanese Society for Medical and Biological ...

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Transactions of Japanese Society for Medical and Biological engineering 2024年第1期62卷 37-44页

作者： Kataoka, Tomohiro Ando, Takeshi Tsuruoka, Noriko Inaba, Ken Haga, Yoichi Graduate School of Biomedical Engineering Tohoku University Japan Components BU Origin Co. Ltd Japan Graduate School of Engineering Tohoku University Japan

The development of cuffless blood pressure monitoring devices is attracting attention. The method of measuring vessel diameter from ultrasound A-mode waveforms is expected to be applied to daily blood pressure measurement due to the simplicity of the device. On the other hand, there is a problem in that the received intensity of the reflected wave from the blood vessel wall decreases due to displacement caused by body movement, resulting in incorrect measurement of the vessel diameter. In this paper, we examine how displacement of the positional relationship between the sensor and the blood vessel affects the measurement of blood vessel diameter and present a solution to the sensitivity reduction caused by angular displacement in the direction of the vessel axis by sending ultrasonic waves radially in the direction of the vessel axis. As a verification, a prototype sensor with an acoustic lens was fabricated. Evaluation of the sensor using a silicone resin tube model of a blood vessel showed that it maintained received intensity of about 50％ of the strongest received intensity over a range of ± 10°and the calculated blood vessel diameter was accurate to ± 0.05 mm over a range of ± 10°. Since this technology does not require a complex system, it is expected to be applied to devices that daily blood pressure measurement without the patientʼs consciousness. © 2024, Japan Soc. of Med. Electronics and Biol. engineering. All rights reserved.

关键词： Blood pressure

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Assessing Hemodynamic Changes in Cerebral Aneurysms Post Coil Embolization: A Preliminary Investigation

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Journal of engineering and Science in Medical Diagnostics and Therapy 2025年第3期8卷 031014页

作者： Monfared, Mohammadali Hollingsworth, Luke Gamage, Peshala Thibbotuwawa Taebi, Amirtaha Biomedical Engineering Program Mississippi State University Mississippi StateMS39762 United States Department of Biomedical Engineering and Science Florida Institute of Technology MelbourneFL32901 United States

A cerebral aneurysm is a weakened area in the wall of a blood vessel within the brain that causes the vessel to bulge outwards. The choice of treatment depends on various factors including the size and location of the aneurysm and the risk of rupture, and should be tailored to individual situations rather than following a universal approach due to their variability among individuals. This approach provides the possibility of choosing precise treatment plans that are proper for each patient's circumstances. The utilization of computational fluid dynamics (CFD) allows for the prediction of after-surgery hemodynamic changes before any surgical approach. The goal of this research was to investigate the flow characteristics and hemodynamic parameters in cerebral arteries before and after endovascular embolization treatments using CFD in three patient-specific geometries with at least one aneurysm at the middle cerebral artery's bifurcation. To model the coiling, the computational domain was divided into two fluid domains, a general fluid domain consisting of the parent arteries and a porous domain inside the aneurysm. CFD modeling was conducted to simulate blood flow in pre- and postcoiling scenarios. Results showed that the coiling model with different porosity values led to a redirection of blood flow away from the aneurysm sac. Additionally, changes in shear stress indicated potential alterations in susceptibility to vascular remodeling. In conclusion, these findings indicated that utilizing CFD modeling for simulating blood flow in patient-specific cerebral arteries could be utilized to predict hemodynamic parameters before any treatment. Copyright © 2025 by ASME.

关键词： Computational fluid dynamics

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Fourier-Based Fast 3-D Ultrasound Imaging Using Row-Column-Addressed 2-D Arrays

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IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 2024年第1期71卷 85-101页

作者： Lin, Shang-Ching Li, Pai-Chi Graduate Institute of Biomedical Electronics and Bioinformatics National Taiwan University Taipei10617 Taiwan National Taiwan University Graduate Institute of Biomedical Electronics and Bioinformatics The Department of Electrical Engineering Taipei10617 Taiwan

A Fourier-based fast 3-D ultrasound imaging method using row-column-addressed (RCA) 2-D arrays is presented. The row elements in an RCA array are activated sequentially, and all the column elements are used to receive. The obtained dataset is adapted to approximate to that obtained using a fully sampled array after a plane wave at a given incident angle is transmitted. In this way, the fast algorithm in plane-wave Fourier imaging (PWFI) can be applied to the adapted dataset. In addition, synthesizing multiple datasets based on multiple incident angles enables angular compounding, which improves the image quality. The proposed method was validated using computer simulations and physical-phantom experiments. The results show that the spatial resolution and contrast of the proposed method are comparable with those of its PWFI counterpart without requiring a fully sampled (FS) array. Compared with the delay-and-sum (DAS) method using the RCA array, the proposed method provides comparable spatial resolution but lower contrast;however, the computational complexity is significantly reduced from O(N4Nz) to O(WN2Nz log2 (N2Nz)), where N is the number of elements on each side of the RCA array, Nz is the number of voxels in the axial direction in the output image, and W is the number of compounding angles. For example, in the simulated results when the maximum compounding angle M is 5°, at a given point the lateral - 6-dB width provided by the proposed method is 0.241 mm (0.267 mm for DAS), the contrast ratio of a hyperechoic cyst is 8.87 dB (9.10 dB for DAS), the number of real number operations is reduced by a factor of 20.62, and the number of memory accesses is reduced by a factor of 47.21, both compared with DAS. This novel fast algorithm could facilitate the development of compact real-time 3-D imaging systems, especially when the channel count is high and a large field of view (FOV) is required. © 1986-2012 IEEE.

关键词： Ultrasonic imaging

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