Acta of bioengineering and biomechanics最新文献_第6页

Analysis of friction and wear processes in an innovative spine stabilization system. Part 1. A study of static and kinetic friction of a metal rod-polymer cord friction joint 一种新型脊柱稳定系统的摩擦和磨损过程分析。第1部分。金属杆-聚合物绳摩擦接头静摩擦与动摩擦的研究

IF 1 4区医学

Acta of bioengineering and biomechanics Pub Date : 2022-01-01 DOI: 10.37190/abb-01962-2021-03

A. Brończyk

{"title":"Analysis of friction and wear processes in an innovative spine stabilization system. Part 1. A study of static and kinetic friction of a metal rod-polymer cord friction joint","authors":"A. Brończyk","doi":"10.37190/abb-01962-2021-03","DOIUrl":"https://doi.org/10.37190/abb-01962-2021-03","url":null,"abstract":"Purpose: This analysis is the first part of research that aims to develop a model of the tribological wear of PE-UHMW cord – biometal rod combination. This type of sliding joint is applied in spine stabilization systems that enable the treatment of early-onset idiopathic scoliosis. Methods: The friction tests included force measurements, followed by the determination of static and kinetic friction coefficients as a function of the number of the performed movement cycles, and static friction coefficient with regards to the string tension force FN in the range of 50–300 N. Additionally, the surface roughness and microscopic observations of the metal rods were made. The friction measurements were carried out at a stabilized temperature T = 38 °C in the presence of distilled water and acidic sodium lactate. Results: The measurements confirmed the impact of both the number of completed movement cycles and the value of the force loaded on the cord on the static friction coefficient. Similar values of kinetic friction force occur for the pairs with the titanium alloys rods, as well as for the pairs with the steel and CoCr rod. The type of lubricant affected the obtained measurement results unevenly: (Ti6Al4V and Ti6Al7Nb – slight impact, steel 316L and CoCrMo – large impact). During microscopic observations, numerous wear products, were visible, including harder than the base material large conglomerates. Conclusions: Susceptibility of polymer fibres results in its increased resistance to wear, but it can be also combined with an increase in wear of the surface of the metal rod.","PeriodicalId":6897,"journal":{"name":"Acta of bioengineering and biomechanics","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69999540","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of friction and wear processes in an innovative spine stabilization system. Part 2. A study and model of the wear of a metal rod-polymer cord friction joint 一种新型脊柱稳定系统的摩擦和磨损过程分析。第2部分。金属杆-聚合物绳摩擦接头磨损的研究与模型

IF 1 4区医学

Acta of bioengineering and biomechanics Pub Date : 2022-01-01 DOI: 10.37190/abb-01963-2021-04

A. Brończyk

{"title":"Analysis of friction and wear processes in an innovative spine stabilization system. Part 2. A study and model of the wear of a metal rod-polymer cord friction joint","authors":"A. Brończyk","doi":"10.37190/abb-01963-2021-04","DOIUrl":"https://doi.org/10.37190/abb-01963-2021-04","url":null,"abstract":"Purpose: The purpose of this study was to model and describe the processes and phenomena occurring during the sliding interaction between biometal rods (titanium alloys Ti6Al4V and Ti6Al7Nb, austenitic steel AISI 316L, alloy CoCrMo) and PE-UHMW cords, used in spine stabilization systems to treat early-onset idiopathic scoliosis. Methods: The wear of friction joints in two lubricating solutions (acidic sodium lactate and distilled water) at stabilized temperature T = 38 C was studied. The wear of the polymeric cords was investigated through analyses of the chemical composition of the surface of the cords and microscopic examinations of the changes occurring on this surface. In addition, microscopic examinations and EDS analyses of the wear products filtered out from the lubricating medium were carried out. Results: Metallic particles were found to be present in both lubricating solutions at each stage of the friction process. The largest amount of metallic particles was recorded after 5000 motion cycles. Conclusions: The presence of metallic wear products is an evidence of the wear of the harder metal rod due to its friction against the PE-UHMW cord. This means that the use of guided-growth implants poses a risk of inflammations in the peri-implant tissues.","PeriodicalId":6897,"journal":{"name":"Acta of bioengineering and biomechanics","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69999551","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The effects of selected lower limb muscle activities on a level of imbalance in reaction on anterior-posterior ground perturbation 选择下肢肌肉活动对前后地面扰动反应不平衡水平的影响

IF 1 4区医学

Acta of bioengineering and biomechanics Pub Date : 2022-01-01 DOI: 10.37190/abb-02112-2022-02

P. Wodarski, M. Chmura, Michał Szlęzak, Grzegorz Gruszka, Justyna Romanek, J. Jurkojć

{"title":"The effects of selected lower limb muscle activities on a level of imbalance in reaction on anterior-posterior ground perturbation","authors":"P. Wodarski, M. Chmura, Michał Szlęzak, Grzegorz Gruszka, Justyna Romanek, J. Jurkojć","doi":"10.37190/abb-02112-2022-02","DOIUrl":"https://doi.org/10.37190/abb-02112-2022-02","url":null,"abstract":"Purpose We investigated whether an increase in muscular tone induced by the information about imminent posture destabilisation brings a positive result and prevents such destabilisation. Methods We measured forward and backwards movements of 38 participates (27 females and 11 males, aged 23 (SD 2.6)) on the treadmill (forward and backward movements). All participants were subject to three test condition trials (Tr): 1) subject did not know the nature and time of perturbation (Tr1); 2) subject knew the nature of perturbation but did not know time (Tr2); 3) both the time and nature of perturbation were known precisely (Tr3). The tests resulted in the determination of muscular activity connected with a postural adjustment as well as values of pressure exerted by the forefoot on the ground, and the angle of flexion in the knee joint. Results In terms of postural adjustments it was possible to observe statistically significant differences in muscular activity between Tr1 and Tr2 refer to Tr3. No statistically significant differences were identified in all phases as regards values of forefoot pressure and those concerning the angle of flexion in the knee joint. An increase in the muscle tone before perturbation was correlated with the displacement and the velocity of the COP after perturbation. Conclusions These data indicate that knowledge of the expected time of perturbation is responsible for postural adjustment. Furthermore, muscle tone resulting from an adjustment of perturbation and responsible for the stiffening of lower limbs triggered greater displacement of the COP after perturbation.","PeriodicalId":6897,"journal":{"name":"Acta of bioengineering and biomechanics","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70000021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Biomechanical analysis of thorax-abdomen response of vehicle occupant under seat belt load considering different frontal crash pulses 考虑不同正面碰撞脉冲的安全带载荷下汽车乘员胸腹反应生物力学分析

IF 1 4区医学

Acta of bioengineering and biomechanics Pub Date : 2022-01-01 DOI: 10.37190/abb-02155-2022-02

Jinlong Qiu, Kui Li, Hongyi Xiang, Jingru Xie, Zhuangqin Fan, Mingxin Qin

{"title":"Biomechanical analysis of thorax-abdomen response of vehicle occupant under seat belt load considering different frontal crash pulses","authors":"Jinlong Qiu, Kui Li, Hongyi Xiang, Jingru Xie, Zhuangqin Fan, Mingxin Qin","doi":"10.37190/abb-02155-2022-02","DOIUrl":"https://doi.org/10.37190/abb-02155-2022-02","url":null,"abstract":"Purpose: The purpose of this work was to understand the biomechanical response and injury risk of thorax and abdomen of vehicle front seat occupants caused by seat belt load under different frontal crash pulses. Methods: A vehicle-seat-occupant subsystem finite element (FE) model was developed using the a assembly of vehicle front seat and seat belt together with the THUMS (Total Human body Model for Safety) AM50 (50th% Adult Male) occupant model. Then the typical vehicle frontal crash pulses from different impact scenarios were applied to the vehicle-seat-occupant subsystem FE model, and the predictions from the occupant model were analyzed. Results: The modeling results indicate that the maximum sternal compression of the occupant caused by seat belt load is not sensitive to the peek of the crash pulse but sensitive to the energy contained by the crash pulse in the phrase before seat belt load reaching its limit. Injury risk analysis implies that seat belt load of the four crash scenarios considered in the current work could induce a high thorax AIS2+ injury risk (>80%) to the occupants older than 70 years, and a potential injury risk to the spleen. Conclusions: The findings suggest that control of the energy in the first 75 ms of the crash pulse is crucial for vehicle safety design, and thorax tolerance of the older population and spleen injury prevention are the key considerations in developing of seat belt system.","PeriodicalId":6897,"journal":{"name":"Acta of bioengineering and biomechanics","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70000211","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of friction and wear processes in an innovative spine stabilization system. Part 2. A study and model of the wear of a metal rod-polymer cord friction joint. 创新脊柱稳定系统的摩擦和磨损过程分析。第 2 部分。金属杆-聚合物绳索摩擦接头的磨损研究与模型。

IF 1 4区医学

Acta of bioengineering and biomechanics Pub Date : 2022-01-01

Anna Brończyk

{"title":"Analysis of friction and wear processes in an innovative spine stabilization system. Part 2. A study and model of the wear of a metal rod-polymer cord friction joint.","authors":"Anna Brończyk","doi":"","DOIUrl":"","url":null,"abstract":"Purpose: The purpose of this study was to model and describe the processes and phenomena occurring during the sliding interaction between biometal rods (titanium alloys Ti6Al4V and Ti6Al7Nb, austenitic steel AISI 316L, alloy CoCrMo) and PE-UHMW cords, used in spine stabilization systems to treat early-onset idiopathic scoliosis.Methods: The wear of friction joints in two lubricating solutions (acidic sodium lactate and distilled water) at stabilized temperature T = 38 °C was studied. The wear of the polymeric cords was investigated through analyses of the chemical composition of the surface of the cords and microscopic examinations of the changes occurring on this surface. In addition, microscopic examinations and EDS analyses of the wear products filtered out from the lubricating medium were carried out.Results: Metallic particles were found to be present in both lubricating solutions at each stage of the friction process. The largest amount of metallic particles was recorded after 5000 motion cycles.Conclusions: The presence of metallic wear products is an evidence of the wear of the harder metal rod due to its friction against the PE-UHMW cord. This means that the use of guided-growth implants poses a risk of inflammations in the peri-implant tissues.","PeriodicalId":6897,"journal":{"name":"Acta of bioengineering and biomechanics","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139680508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparative analyses of blood flow through mechanical trileaflet and bileaflet aortic valves. 通过机械三叶主动脉瓣和双叶主动脉瓣的血流比较分析。

IF 1 4区医学

Acta of bioengineering and biomechanics Pub Date : 2022-01-01

Marek Pawlikowski, Anna Nieroda

{"title":"Comparative analyses of blood flow through mechanical trileaflet and bileaflet aortic valves.","authors":"Marek Pawlikowski, Anna Nieroda","doi":"","DOIUrl":"","url":null,"abstract":"Purpose: The primary aim of the present study was to compare the bileaflet and trileaflet aortic valves' performance during uniform blood flow model and boundary conditions. The secondary aim of the study was to determine the effect of Newtonian/non-Newtonian fluid flow assumption on blood flow directly behind the trileaflet valve.Methods: The geometrical model of the whole system consist of the left ventricle, fragment of the aorta and mechanical valves. A representation of pulsatile flow was obtained by measuring blood flow velocity (Doppler ultrasound examination). We have assumed turbulent blood flow. We considered two blood models, Newtonian and non-Newtonian (Carreau model). The valves' performance was assessed using the reduced stress in the valves, the shear stress in the aortic wall, flow velocity field and the effective orifice area.Results: The maximum von Mises stress for the bileaflet valve leaflets was 0.3 MPa and for the trileaflet valve - 0.06 MPa. The maximum flow velocity for the bileaflet valve was 4.52 m/s for 40° and for the trileaflet valve - 5.74 m/s. Higher shear stress was present in the bileaflet (151.5 Pa) than for the trileaflet valve (49.64 Pa).Conclusions: The results indicate that central blood jet for the trileaflet valve contributes to more physiological blood flow and decreases the risk of haemolysis. The central flow minimises the risk of leaflet dislocation. In addition, lower stresses extend the durability of the valve. However, the trileaflet valve geometry has also disadvantages, for instance, small peripheral streams or relatively low effective orifice area.","PeriodicalId":6897,"journal":{"name":"Acta of bioengineering and biomechanics","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139680510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of the base of support widths on postural control and feet loading symmetry during squat - preliminary study. 下蹲时支撑基座宽度对姿势控制和双脚负荷对称性的影响--初步研究。

IF 1 4区医学

Acta of bioengineering and biomechanics Pub Date : 2022-01-01

Justyna Kędziorek, Michalina Błażkiewicz

引用次数: 0

Novel curve fitting method based on constrained optimization for the modelling of human brain aneurysms using Mooney-Rivlin hyperelastic materials in the entire range of deformations til rupture. 基于约束优化的新型曲线拟合方法，用于使用穆尼-里夫林超弹性材料在整个变形范围内对人体脑动脉瘤进行建模，直至破裂。

IF 1 4区医学

Acta of bioengineering and biomechanics Pub Date : 2022-01-01

Brigitta K Tóth, András Lengyel

{"title":"Novel curve fitting method based on constrained optimization for the modelling of human brain aneurysms using Mooney-Rivlin hyperelastic materials in the entire range of deformations til rupture.","authors":"Brigitta K Tóth, András Lengyel","doi":"","DOIUrl":"","url":null,"abstract":"Purpose: Brain aneurysms often prove fatal if ruptured, therefore, understanding their mechanical behaviour in the coupled system of vessels and blood flow can significantly help preventive surgical treatment. The purpose of this work was to analyse measurement data and to determine material parameters for the hyperelastic Mooney-Rivlin model for model building and numerical simulations of aneurysms.Methods: A total of 88 human brain aneurysm specimens of 41 patients obtained from surgery were processed in this work based on the tests performed by the authors in a previous project. A novel algorithm was proposed and applied in this work to fit stress-stretch ratio curves for multiple measurement data using constrained optimization with hard conditions to comply with known mechanical behaviour.Results: The method produced parameters of stretch ratio-stress curves for a number of groups of the specimens representing the average as well as the extreme stresses, separately for male and female subsamples. Stretch range both in compression and in tension up to rupture was covered and material stability for the entire range was also verified.Conclusions: The fitted curves with recommended range of validity are directly applicable to numerical finite element or coupled simulations of aneurysms supporting preventive medical treatment or decision making.","PeriodicalId":6897,"journal":{"name":"Acta of bioengineering and biomechanics","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139680518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of friction and wear processes in an innovative spine stabilization system. Part 1. A study of static and kinetic friction of a metal rod-polymer cord friction joint. 创新脊柱稳定系统的摩擦和磨损过程分析。第 1 部分。金属杆-聚合物绳摩擦接头的静摩擦和动摩擦研究。

IF 1 4区医学

Acta of bioengineering and biomechanics Pub Date : 2022-01-01

Anna Brończyk

{"title":"Analysis of friction and wear processes in an innovative spine stabilization system. Part 1. A study of static and kinetic friction of a metal rod-polymer cord friction joint.","authors":"Anna Brończyk","doi":"","DOIUrl":"","url":null,"abstract":"Purpose: This analysis is the first part of research that aims to develop a model of the tribological wear of PE-UHMW cord - biometal rod combination. This type of sliding joint is applied in spine stabilization systems that enable the treatment of early-onset idiopathic scoliosis.Methods: The friction tests included force measurements, followed by the determination of static and kinetic friction coefficients as a function of the number of the performed movement cycles, and static friction coefficient with regards to the string tension force FN in the range of 50-300 N. Additionally, the surface roughness and microscopic observations of the metal rods were made. The friction measurements were carried out at a stabilized temperature T = 38 °C in the presence of distilled water and acidic sodium lactate.Results: The measurements confirmed the impact of both the number of completed movement cycles and the value of the force loaded on the cord on the static friction coefficient. Similar values of kinetic friction force occur for the pairs with the titanium alloys rods, as well as for the pairs with the steel and CoCr rod. The type of lubricant affected the obtained measurement results unevenly: (Ti6Al4V and Ti6Al7Nb - slight impact, steel 316L and CoCrMo - large impact). During microscopic observations, numerous wear products, were visible, including harder than the base material large conglomerates.Conclusions: Susceptibility of polymer fibres results in its increased resistance to wear, but it can be also combined with an increase in wear of the surface of the metal rod.","PeriodicalId":6897,"journal":{"name":"Acta of bioengineering and biomechanics","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139680530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study of talented young male swimmers - scientific approach to the kinematic and physiological predictors of 400-m front crawl race. 对有天赋的年轻男子游泳运动员的研究--用科学方法预测 400 米前爬泳比赛的运动学和生理学因素。

IF 1 4区医学

Acta of bioengineering and biomechanics Pub Date : 2022-01-01

Kamil Sokołowski, Marek Strzała, Magdalena Żegleń

{"title":"Study of talented young male swimmers - scientific approach to the kinematic and physiological predictors of 400-m front crawl race.","authors":"Kamil Sokołowski, Marek Strzała, Magdalena Żegleń","doi":"","DOIUrl":"","url":null,"abstract":"Purpose: The purpose of this study was to assess the influence of physiological and kinematic predictors on 400-m front crawl race in young male swimmers and to consider the interrelation between them.Methods: Nineteen male swimmers took part in this study (age: 13.5 ± 0.44 years, height: 168.6 ± 7.77 cm, body mass: 56.9 ± 10.57 kg). Measurements of physiological parameters were conducted using expired air analyzer (Start 2000 MES, Poland) during step-test in water flume. Kinematic indices were computed while analyzing video recording of 400-m front crawl race. To check for possible influence of biological age (BA) diversity in studied group, partial correlation with age control was computed.Results: Swimming to exhaustion in water flume defined as speed at maximum oxygen uptake and anaerobic threshold ( VVO2 max and VAT) occurred to be strongly positively correlated with 400-m race speed. Speed in surface swimming zones (Vsurface) was related to ability of kinematics adjustment and significantly correlated with stroke index (SI). Vsurface at the beginning and the end of the race, i.e., at 1st, 7th and 8th lap interplayed with stroke rate (SR) measured at corresponding laps.Conclusions: Our study showed that 400-m front crawl performance of young male swimmers is strongly dependent on swimming efficiency developed with aerobic conditioning. Significant role of proper pacing strategy was also identified, which indicates that race pace training should be implemented.","PeriodicalId":6897,"journal":{"name":"Acta of bioengineering and biomechanics","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139680538","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0