Article
Multidisciplinary Sciences
Michal Murawa, Jakub Otworowski, Sebastian But, Jaroslaw Kabacinski, Lukasz Kubaszewski, Adam Gramala
Summary: The development of modern technologies has made it easier to regain the ability to walk after losing a lower limb. However, the affordability of prosthetic feet remains a challenge.
Article
Multidisciplinary Sciences
Hui-Jin Um, Heon-Su Kim, Woolim Hong, Hak-Sung Kim, Pilwon Hur
Summary: In this study, a prosthetic foot with an improved toe part was designed by mimicking human foot characteristics and utilizing various shape factors. Finite element analysis and structural optimization were conducted to find a structure with characteristics similar to the human foot, resulting in good agreement with human foot behavior in the toe torque-angle curve. The designed prosthetic foot structure was validated to implement human foot function by comparing with human walking data.
SCIENTIFIC REPORTS
(2021)
Article
Environmental Sciences
Thanyaporn Rakbangboon, Gary Guerra, Saloottra Kla-arsa, Uthumporn Padungjaroen, Pairat Tangpornprasert, Chanyaphan Virulsri, Kazuhiko Sasaki
Summary: The outcomes of users provided with a commercial ESR Vari-Flex foot and a locally designed sPace foot were investigated, and it was found that the sPace foot performed well in high-level mobility outcome measures. Participants using the sPace foot were capable of performing walking, high-level mobility, and activity outcome measures.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
(2022)
Article
Engineering, Mechanical
Amirreza Naseri, Majid Mohammadi Moghaddam, Martin Grimmer, Maziar Ahmad Sharbafi
Summary: Passive prosthetic feet are unable to reproduce the full range of motion and push-off force of the human biological ankle. In this study, we propose a Hybrid-Hydraulic Ankle Prosthesis (H2AP) that offers a greater range of motion and push-off support compared to traditional carbon feet. The H2AP design includes a carbon foot and a hydraulic unit comprising of dorsiflexion and plantar flexion dampers, as well as a unidirectional spring. Mathematical analyses and simulations were used to optimize the design and replicate human ankle behavior during unimpaired walking. The pilot walking experiments with a transtibial amputee subject demonstrated the usability and functionality of the H2AP on level ground and a treadmill. The proposed design methodology can also be applied in the development of other assistive devices.
MECHANISM AND MACHINE THEORY
(2022)
Article
Medicine, General & Internal
Natthawan Sutthison, Kazuhiko Sasaki, Gary Guerra, Sirarat Chaisumritchoke, Wisavaporn Niamsang, Thanatat Charatrungolan
Summary: This study evaluated the function and satisfaction of three types of hand prostheses (conventional hand, functional hook, and hand with moving interphalangeal joints) in trans-radial amputees. The results showed that participants performed better on a hand function test when using the hand with moving interphalangeal joints compared to the other two types of prostheses. This study demonstrates the potential of hand prostheses with moving interphalangeal joints in improving hand dexterity.
ANNALS OF MEDICINE
(2023)
Article
Mathematics, Interdisciplinary Applications
Eduard S. Scheiterer, Sigrid Leyendecker
Summary: This study investigates the epistemic uncertainty of fuzzy parameters in a multibody forward dynamics simulation of the human leg with a prosthetic foot. The research considers two cases: large movements resembling the swing phase during human gait and prosthesis deformation under the body weight. By using a variational integrator to solve the motion equations and implementing the Graph Follower algorithm, the study successfully incorporates the epistemic uncertainty. The modified algorithm greatly improves computational efficiency and enables the propagation of fuzzy uncertainty in a complex multibody model consisting of rigid and flexible bodies.
COMPUTATIONAL MECHANICS
(2022)
Article
Neurosciences
Rafael Morand, Tobia Brusa, Nina Schnueriger, Sabrina Catanzaro, Martin Berli, Volker M. Koch
Summary: This study investigates the redirection of force feedback from prosthetic hands to the foot to overcome the drawbacks of adding a feedback system in the prosthetic socket. A vibrotactile insole was developed, and a pilot trial involving experienced users of myoelectric prostheses was conducted. The results showed positive effects in the sorting task with vibrotactile feedback, but varied outcomes in manipulation tasks. The redirection of feedback to the feet aligns with previous studies applied to the residual arm.
FRONTIERS IN NEUROSCIENCE
(2022)
Article
Rehabilitation
Tonya L. Rich, Greg Voss, Stuart Fairhurst, Mary Matsumoto, Steven Brielmaier, Karl Koester, Theoden Netoff, Andrew H. Hansen, John E. Ferguson
Summary: This study describes the design and testing of a novel sensor system for measuring distal end weight bearing in prosthetic sockets and alerting users of poor socket fit. The results show consistent relationships between the sensor measurements and socket fit, and users expressed interest in the device, highlighting its potential benefits during early prosthesis training.
DISABILITY AND REHABILITATION
(2023)
Article
Neurosciences
Hiroshi Hashimoto, Toshiki Kobayashi, Masataka Kataoka, Kuniharu Okuda
Summary: This study found that changes in prosthetic foot alignment can predict the magnitude and timing of socket reaction moments. These results are helpful for evaluating foot alignment in transtibial prostheses.
Article
Engineering, Mechanical
SuChak Ryu, JoonHyub Kim, WooSob Sim, Seung Hyeon Kim
Summary: This study aimed to develop a prosthetic foot for low-income individuals. The material used in the 3D printed prosthetic foot was tested for its suitability. The results showed that it can be used for this application. Ankle multi-axis rotation device, metatarsal head, and toe joint were introduced to ensure comfortable walking. The muscle power required for walking was simulated and the prosthetic foot exceeded the required values, indicating its effectiveness in aiding walking.
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2023)
Article
Immunology
Nicolas Pellaton, Dominique Sanglard, Frederic Lamoth, Alix T. Coste
Summary: By comparing two different commercial microdilution antifungal susceptibility testing (AFST) methods, this study demonstrates the valuable use of both methods in detecting antifungal resistance due to point mutations in antifungal resistance genes. It also highlights the difficulty of conducting conclusive analyses without antifungal gene sequence data as a gold standard.
FRONTIERS IN CELLULAR AND INFECTION MICROBIOLOGY
(2022)
Article
Engineering, Biomedical
Jenna K. Burnett, Young T. Choi, Hua Li, Norman M. Wereley, Ross H. Miller, Jae Kun Shim
Summary: This study investigated the high-frequency vibration suppression of ESAR feet using piezoelectric shunt damping patches. The results showed that this method can effectively reduce vibrations and potentially decrease tissue damage, but further research is needed to optimize the approach for maximal effectiveness.
IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING
(2021)
Article
Engineering, Biomedical
Vahideh Moradi, Mohammad Ali Sanjari, Nick Stergiou
Summary: This study evaluated the effect of asymmetric prosthesis on individuals with unilateral transfemoral amputation. The results showed that under prosthetic modifications, the intact limb step length increased and the prosthetic step length decreased for most participants. However, the prosthetic modifications did not have significant effects on Floquet multiplier, step length, and step time variability.
CLINICAL BIOMECHANICS
(2022)
Article
Engineering, Biomedical
Wahbi Mankai, Brahim Ben Smida, Moez Chafra, Ridha Ben Cheikh
Summary: The study introduces a semi-analytical model to understand the impact of the amputee's walking time on the socket lifespan, providing valuable information for designers to predict the fatigue life of the socket.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART H-JOURNAL OF ENGINEERING IN MEDICINE
(2021)
Review
Endocrinology & Metabolism
Xing-xi Hu, Zheng-zhong Xiu, Gui-chun Li, Ji-yuan Zhang, Long-jun Shu, Zhong Chen, Han Li, Qing-feng Zou, Quan Zhou
Summary: This study evaluated the effectiveness and safety of transverse tibial bone transport (TTT) in treating diabetic foot ulcerations (DFUs). The findings showed that TTT operation had high healing rate and limb salvage rate, and significantly improved ankle-brachial index, skin temperature, and visual analogue scale. However, caution should be exercised regarding the risk of fracture, pin-site infection, and skin necrosis after TTT operation in DFU patients.
FRONTIERS IN ENDOCRINOLOGY
(2023)
Article
Emergency Medicine
Jan Kocis, Martin Kelbl, Tomas Kocis, Tomas Navrat
EUROPEAN JOURNAL OF TRAUMA AND EMERGENCY SURGERY
(2020)
Article
Materials Science, Multidisciplinary
Larissa Moravcikova-Gouvea, Igor Moravcik, Milan Omasta, Jozef Vesely, Jan Cizek, Peter Minarik, Jan Cupera, Antonin Zadera, Vit Jan, Ivo Dlouhy
MATERIALS CHARACTERIZATION
(2020)
Article
Metallurgy & Metallurgical Engineering
Jan Suchy, Libor Pantelejev, David Palousek, Daniel Koutny, Jozef Kaiser
Article
Engineering, Mechanical
L. B. Shi, C. Wang, H. H. Ding, D. Kvarda, R. Galas, M. Omasta, W. J. Wang, Q. Y. Liu, M. Hartl
TRIBOLOGY INTERNATIONAL
(2020)
Article
Chemistry, Physical
Tomas Navrat, David Halabuk, Petr Vosynek
Article
Engineering, Mechanical
Daniel Kvarda, Radovan Galas, Milan Omasta, Lu-bing Shi, Haohao Ding, Wen-jian Wang, Ivan Krupka, Martin Hartl
Summary: A numerical model is used to evaluate friction in water-contaminated wheel-rail contact, with the plastic deformation model predicting more accurate transition in mixed lubrication regime.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Mechanical
C. Wang, L. B. Shi, H. H. Ding, W. J. Wang, R. Galas, J. Guo, Q. Y. Liu, Z. R. Zhou, M. Omasta
Summary: The study investigated the influence of four types of mineral particles on adhesion enhancement and damages on wheel/rail, revealing the relationship between crushing strengths and adhesion performance. Sand was found to be the most suitable adhesion enhancer, providing good adhesion enhancement with relatively mild damage to wheel/rail materials.
Article
Engineering, Mechanical
Jingdong Song, Lubing Shi, Haohao Ding, Radovan Galas, Milan Omasta, Wenjian Wang, Jun Guo, Qiyue Liu, Martin Hartl
Summary: The study investigated the effects of a solid friction modifier on friction, wear, and rolling contact fatigue damage in railway wheel-rail materials. Results showed that applying the modifier led to decreased friction coefficient, reduced wear rates, and lowered thickness and hardness of plastic deformation layers. By managing friction, wear, and RCF damage, the performance of railway rolling stock can be improved.
Article
Engineering, Mechanical
Qun Li, Bing-nan Wu, Hao-hao Ding, Radovan Galas, Daniel Kvarda, Qi-yue Liu, Zhong-rong Zhou, Milan Omasta, Wen-jian Wang
Summary: This study investigates the effect of friction modifiers on the adhesion coefficient in the wheel/rail interface. By using a non-Newtonian fluid model and micro-EHL analysis, the relationship between the adhesion coefficient and the quantity of friction modifiers is determined.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Multidisciplinary
Daniel Kvarda, Simon Skurka, Radovan Galas, Milan Omasta, Lu-bing Shi, Haohao Ding, Wen-jian Wang, Ivan Krupka, Martin Hartl
Summary: The effect of top of rail lubricant composition on adhesion was investigated, with solid particles for friction modification found to be the most dominant component. Optimized top of rail lubricant substances showed the best adhesion performance and resilience to overdosing.
ENGINEERING SCIENCE AND TECHNOLOGY-AN INTERNATIONAL JOURNAL-JESTECH
(2022)
Article
Engineering, Civil
Daniel Kvarda, Radovan Galas, Milan Omasta, Martin Hartl, Ivan Krupka, Marian Dzimko
Summary: In this study, the friction-displacement properties of three types of top-of-rail products were investigated using a high-pressure torsion device. The results showed that the tested products were highly sensitive to the applied amount and that the increase in temperature had a negligible effect on the applied products.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART F-JOURNAL OF RAIL AND RAPID TRANSIT
(2023)
Article
Engineering, Mechanical
Qun Li, Shu-Yue Zhang, Bing-Nan Wu, Qiang Lin, Hao-Hao Ding, Radovan Galas, Daniel Kvarda, Milan Omasta, Wen-Jian Wang, Ze-Feng Wen
Summary: This paper presents a method to analyze the starved elastohydrodynamic lubrication of the wheel-rail surface coated with friction modifiers (FMs). The study finds that the adhesion coefficient increases with the increase in surface roughness and decrease in FM film thickness. The influence of FMs on the fatigue of wheel and rail is analyzed based on subsurface stress distribution and shakedown map.
Article
Acoustics
Lubos Smolik, Jan Rendl, Milan Omasta, Miroslav Byrtus, Petr Sperka, Pavel Polach, Martin Hartl, Michal Hajzman
Summary: This paper investigates the effects of mechanically induced textures on the stability of journal bearings, focusing on lightly loaded bearings commonly used in vertical rotors and microturbines. The results show that textures near the minimum oil film thickness can improve stability at low loads, but have little effect at a specific load of 0.15 MPa. The paper also discusses computational methods for dealing with cavitation and highlights the sensitivity of numerical results to the density of computational mesh.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Engineering, Mechanical
Radovan Galas, Simon Skurka, Martin Valena, Daniel Kvarda, Milan Omasta, Haohao Ding, Qiang Lin, Wen-jian Wang, Ivan Krupka, Martin Hartl
Summary: This study designs a benchmarking methodology using a standard tribometer to investigate the performance of top-of-rail products. The methodology allows for assessment of performance from multiple perspectives and divides the products into four performance classes.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Radovan Galas, Milan Omasta, Lu-bing Shi, Haohao Ding, Wen-jian Wang, Ivan Krupka, Martin Hartl
TRIBOLOGY INTERNATIONAL
(2020)