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The role of primary cilia in mechanical transmission of osteocyte based on a 3D finite element model

Medicine in Novel Technology and Devices 2024年第1期21卷 31-38页

作者： Zhuang Han Dong Ding yu-bo fan Xin-tong Wu Xiao Yang Lian-wen Sun Key Laboratory of Biomechanics and Mechanobiology(Beihang University)Ministry of Education Beijing Advanced Innovation Center for Biomedical EngineeringSchool of Biological Science and Medical EngineeringBeihang UniversityBeijing100083China Department of Cardiology State Key Laboratory of Complex Severe and Rare DiseasesPeking Union Medical College HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijingChina

The primary cilium,as a mechanical receptor of osteocytes,participates in the regulation of osteocyte ***,how the length of osteocyte primary cilia changes with fluid shear stress(FSS)are unclear,and how the mechanical transmission within osteocytes altered by primary cilia is not well understood ***,the ciliary length changes of osteocyte under 15dyn/cm2 of FSS were experimentally detected,and then 3D finite element models of osteocyte primary cilia containing the basal body and axoneme were *** results showed that(1)The ciliary length of the CON group,FSS 1h,and FSS 6h were 3.71±1.34μm,3.79±1.04μm,and 1.24±0.73μm respectively,indicating the different durations of FSS might lead to the adaptive changes of cilium *** calculations showed(2)when the ciliary length became shorter with the ciliary angle stayed the same,the deformation and stress of the cell membrane and membrane skeleton was ***,the deformation and stress of the cilia membrane,basal body,the rotation angles of basal body were decreased,and those of cytoplasm,cytoskeleton,actin cortex and nucleus were also decreased;(3)With the decrease of the ciliary angle,the deformation and stress of the cilia membrane,basal body,as well as the rotation angles of basal body were *** of the cytoplasm,cytoskeleton,actin cortex,and nucleus were also increased except the cell membrane and membrane *** calculation results suggested the length and angle of the primary cilia,the deformation and stress of intracellular structures in osteocyte were altered with ciliary basal body,indicated the connection between the basal body and cytoskeleton may be a key factor that affected the mechanical transport in osteocytes across the cell *** finally promoted the adaptive change of ciliary length under FSS.

关键词： Primary cilia Osteocyte model Finite element analysis Mechanotransduction

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Effect of swirling flow on platelet concentration distribution in small-caliber artificial grafts and end-to-end anastomoses

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Acta Mechanica Sinica 2011年第5期27卷 833-839页

作者： fan Zhan yu-bo fan Xiao-Yan Deng Key Laboratory for Biomechanics and Mechanobiologyof Ministry of Education School of Biological Science and Medical EngineeringBeihang University 100191 Beijing China

Platelet concentration near the blood vessel wall is one of the major factors in the adhesion of platelets to the *** our previous studies,it was found that swirling flows could suppress platelet adhesion in small-caliber artificial grafts and end-to-end *** order to better understand the beneficial effect of the swirling flow,we numerically analyzed the near-wall concentration distribution of platelets in a straight tube and a sudden tubular expansion tube under both swirling flow and normal flow *** numerical models were created based on our previous experimental *** simulation results revealed that when compared with the normal flow,the swirling flow could significantly reduce the near-wall concentration of platelets in both the straight tube and the expansion *** present numerical study therefore indicates that the reduction in platelet adhesion under swirling flow conditions in small-caliber arterial grafts,or in end-to-end anastomoses as observed in our previous experimental study,was possibly through a mechanism of platelet transport,in which the swirling flow reduced the near-wall concentration of platelets.

关键词： Platelet near-wall concentration · Swirling flow · Small-caliber arterial grafts · End-to-end anastomosis

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The study on the mechanical characteristics of articular cartilage in simulated microgravity

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Acta Mechanica Sinica 2012年第5期28卷 1488-1493页

作者： Hai-Jun Niu Qing Wang yue-Xiang Wang Ang Li Lian-Wen Sun Yan Yan fan fan De-yu Li yu-bo fan Key Laboratory of the Ministry of Education for Biomechanics and Mechanobiology State Key Laboratory of Software Development EnvironmentSchool of Biological Science and Medical EngineeringBeihang University School of Biomedical Engineering Southern Medical University Department of Ultrasound People Liberation Army General Hospital

The microgravity environment of a long-term space flight may induce acute changes in an astronaut＇s musculo-skeletal systems. This study explores the effects of simulated microgravity on the mechanical characteristics of articular cartilage. Six rats underwent tail suspension for 14 days and six additional rats were kept under normal earth gravity as controls. Swelling strains were measured using high-frequency ultrasound in all cartilage samples subject to osmotic loading. Site-specific swelling strain data were used in a triphasic theoretical model of cartilage swelling to determine the uniaxial modulus of the cartilage solid matrix. No severe surface irregularities were found in the cartilage samples obtained from the control or tail-suspended groups. For the tail-suspended group, the thickness of the cartilage at a specified site, as determined by ultrasound echo, showed a minor decrease. The uniaxial modulus of articular cartilage at the specified site decreased significantly, from （6.31 ± 3.37） MPa to （5.05 ± 2.98）MPa （p 〈 0.05）. The histology- stained image of a cartilage sample also showed a reduced number of chondrocytes and decreased degree of matrix staining. These results demonstrated that the 14 d simulated microgravity induced significant effects on the mechanical characteristics of articular cartilage. This study is the first attempt to explore the effects of simulated microgravity on the mechanical characteristics of articular cartilage using an osmotic loading method and a triphasic model. The conclusions may provide reference information for manned space flights and a better understanding of the effects of microgravity on the skeletal system.

关键词： Simulated microgravity Articular cartilage.Triphasic theory High-frequency ultrasound Uniaxialmodulus

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吉西他滨联合顺铂方案治疗复发性三阴性乳腺癌的疗效观察

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中国合理用药探索 2024年第2期21卷 62-68页

作者：申鹏刘正义闫园于博凡于洋河南省人民医院乳腺外科郑州450000

目的:探究吉西他滨联合顺铂方案在蒽环、紫杉类药物治疗后复发性三阴性乳腺癌(TNBC)患者中的应用效果。方法:选取2019年1月~2021年1月期间某院收治的81例蒽环、紫杉类药物治疗后复发性TNBC患者作为研究对象,采用随机、单盲试验研究方法... 详细信息

目的:探究吉西他滨联合顺铂方案在蒽环、紫杉类药物治疗后复发性三阴性乳腺癌(TNBC)患者中的应用效果。方法:选取2019年1月~2021年1月期间某院收治的81例蒽环、紫杉类药物治疗后复发性TNBC患者作为研究对象,采用随机、单盲试验研究方法,依据随机数字表法分为A组(n=40)和B组(n=41)。A组患者给予注射用盐酸吉西他滨联合卡培他滨片治疗,B组患者给予注射用盐酸吉西他滨联合注射用顺铂治疗。比较两组临床疗效、血清肿瘤标志物[癌胚抗原(CEA)、糖类抗原153(CA153)、糖类抗原125(CA125)]水平变化、生活质量情况[欧洲癌症研究与治疗组织生命质量量表(EORTC QLQ-C30)]、不良反应发生情况及治疗后2年内患者的预后情况。结果:治疗后,B组治疗总有效率(82.93%)高于A组(60.00%,P0.05)。两组患者治疗期间不良反应总发生率比较无统计学差异(P>0.05)。B组患者2年内复发率(14.63%)低于A组(40.00%,P<0.05),中位无进展生存期[(6.65±1.45)个月]长于A组[(4.26±1.23)个月,P<0.05],稳定病例数(58.54%)高于A组(30.00%,P<0.05)。结论:与吉西他滨联合卡培他滨相比,吉西他滨联合顺铂治疗方案在蒽环、紫杉类药物治疗后复发性TNBC患者中临床疗效更佳,可有效降低患者血清肿瘤标志物水平,提高生活质量,改善预后。

关键词：吉西他滨顺铂蒽环紫杉类药物三阴性乳腺癌复发

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Plasma-Enhanced Atomic Layer Deposition of Amorphous Ga_(2)O_(3) for Solar-Blind Photodetection

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Journal of Electronic Science and Technology 2022年第4期20卷 331-344页

作者： Ze-yu fan Min-Ji Yang bo-yu fan Andraz Mavric Nadiia Pastukhova Matjaz Valant bo-Lin Li Kuang Feng Dong-Liang Liu Guang-Wei Deng Qiang Zhou Yan-bo Li Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054 Materials Research Laboratory University of Nova GoricaNova Gorica SI-5000 Yangtza Delta Region Institute(Huzhou) University of Electronic Science and Technology of ChinaHuzhou 313001

Wide-bandgap gallium oxide(Ga_(2)O_(3))is one of the most promising semiconductor materials for solar-blind(200 nm to 280 nm)*** its amorphous form,amorphous gallium oxide(a-Ga_(2)O_(3))maintains its intrinsic optoelectronic properties while can be prepared at a low growth temperature,thus it is compatible with Si integrated circuits(ICs)***,the a-Ga_(2)O_(3) film is directly deposited on pre-fabricated Au interdigital electrodes by plasma enhanced atomic layer deposition(PE-ALD)at a growth temperature of 250°*** stoichiometric a-Ga_(2)O_(3) thin film with a low defect density is achieved owing to the mild PE-ALD *** a result,the fabricated Au/a-Ga_(2)O_(3)/Au photodetector shows a fast time response,high responsivity,and excellent wavelength selectivity for solar-blind ***,an ultra-thin MgO layer is deposited by PE-ALD to passivate the Au/a-Ga_(2)O_(3)/Au interface,resulting in the responsivity of 788 A/W(under 254 nm at 10 V),a 250-nm-to-400-nm rejection ratio of 9.2×10^(3),and the rise time and the decay time of 32 ms and 6 ms,*** results demonstrate that the a-Ga_(2)O_(3) film grown by PE-ALD is a promising candidate for high-performance solar-blind photodetection and potentially can be integrated with Si ICs for commercial production.

关键词： Amorphous gallium oxide(a-Ga_(2)O_(3)) passivation layer plasma enhanced atomic layer deposition(PE-ALD) responsivity solar-blind photodetector

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Plaque components affect wall stress in stented human carotid artery: A numerical study

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Acta Mechanica Sinica 2016年第6期32卷 1149-1154页

作者： Zhen-Min fan Xiao Liu Cheng-Fei Du An-Qiang Sun Nan Zhang Zhan-Ming fan yu-bo fan Xiao-Yan Deng School of Biological Science and Medical Engineering Beihang University Radiologic Department Beijing Anzhen Hospital CapitalMedical University

Carotid artery stenting presents challenges of in-stent restenosis and late thrombosis, which are caused primarily by alterations in the mechanical environment of the artery after stent implantation. The present study constructed patient-specific carotid arterial bifurcation models with lipid pools and calcified components based on magnetic resonance imaging. We numerically analyzed the effects of multicomponent plaques on the distributions of von Mises stresses (VMSs) in the patient-specific models after stenting. The results showed that when a stent was deployed, the large soft lipid pool in atherosclerotic plaques cushioned the host artery and reduced the stress within the arterial wall; however, this resulted in a sharp increase of VMS in the fibrous cap. When compared with the lipid pool, the presence of the calcified components led to slightly increased stresses on the luminal surface. However, when a calcification was located close to the luminal surface of the host artery and the stenosis, the local VMS was elevated. Overall, compared with calcified components, large lipid pools severely damaged the host artery after stenting. Furthermore, damage due to the calcified component may depend on location.

关键词： Atherosclerosis Plaque composition Carotid artery stenting Restenosis Finite-element analysis

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Magnesium based degradable biomaterials： A review

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Frontiers of Materials Science 2014年第3期8卷 200-218页

作者： Xue-Nan GU Shuang-Shuang LI Xiao-Ming LI yu-bo fan Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education School of Biological Science and Medical Engineering Beihang University Beijing 100191 China

Magnesium has been suggested as a revolutionary biodegradable metal for biomedical applications. The corrosion of magnesium, however, is too rapid to match the rates of tissue healing and, additionally, exhibits the localized corrosion mechanism. Thus it is necessary to control the corrosion behaviors of magnesium for their practical use. This paper comprehensively reviews the research progress on the development of representative magnesium based alloys, including Mg-Ca, Mg-Sr, Mg-Zn and Mg-REE alloy systems as well as the bulk metallic glass. The influence of alloying element on their microstructures, mechanical properties and corrosion behaviors is summarized. The mechanical and corrosion properties of wrought magnesium alloys are also discussed in comparison with those of cast alloys. Furthermore, this review also covers research carried out in the field of the degradable coatings on magnesium alloys for biomedical applications. Calcium phosphate and biodegradable polymer coatings are discussed based on different preparation techniques used. We also compare the effect of different coatings on the corrosion behaviors of magnesium alloys substrate.

关键词： magnesium alloy degradable biomaterial coating degradation corrosion

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Influence of screw length and diameter on tibial strain energy density distribution after anterior cruciate ligament reconstruction

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Acta Mechanica Sinica 2014年第2期30卷 241-249页

作者： Jie Yao Guan-Ming Kuang Duo Wai-Chi Wong Wen-Xin Niu Ming Zhang yu-bo fan Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education School of Biological Science and Medical Engineering/National Key Lab of Virtual Reality TechnologyBeihang University Interdisciplinary Division of Biomedical Engineering Faculty of EngineeringThe Hong Kong Polytechnic University Shenzhen Key Laboratory for Innovative Technology in Orthopaedic Trauma Department of Orthopaedics and TraumatologyThe University of Hong Kong-Shenzhen Hospital The University of Hong Kong Tongji University School of Medicine

Postoperative tunnel enlargement has been frequently reported after anterior cruciate ligament（ACL）*** screw,as a surgical implant in ACL reconstruction,may influence natural loading transmission and contribute to tunnel *** aims of this study are（1）to quantify the alteration of strain energy density（SED）distribution after the anatomic single-bundle ACL reconstruction;and（2）to characterize the influence of screw length and diameter on the degree of the SED alteration.A validated finite element model of human knee joint was *** screw length ranging from 20 to 30 mm with screw diameter ranging from 7 to 9 mm were *** the post-operative knee,the SED increased steeply at the extra-articular tunnel aperture under compressive and complex loadings,whereas the SED decreased beneath the screw shaft and nearby the intra-articular tunnel *** the screw length could lower the SED deprivation in the proximal part of the bone tunnel;whereas increasing either screw length or diameter could aggravate the SED deprivation in the distal part of the bone *** the elastic modulus of the screw could lower the bone SED deprivation around the *** consideration of both graft stability and SED alteration,a biodegradable interference screw with a long length is recommended,which could provide a beneficial mechanical environment at the distal part of the tunnel,and meanwhile decrease the bone-graft motion and synovial fluid propagation at the proximal part of the *** findings together with the clinical and histological factors could help to improve surgical outcome,and serve as a preliminary knowledge for the following study of biodegradable interference screw.

关键词： Anterior crucial ligament reconstruction Strain energy density Screw length Screw diameter

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Potential Maintenance Mechanism in Atrial Fibrillation Patients Subject to Different Treatment Procedures： A Preliminary Study Based on a Human Atrial Model

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Current Medical Science 2018年第3期38卷 422-426页

作者： Zhao-lian OUYANG Li-ping SUN Hui CHI Ling XIA Ying-lan GONG yu-bo fan Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education School of Biological Science and Medical Engineering Beihang University Beijing 100083 China Institute of Medical Information (IMI) Chinese Academy of Medical Sciences (CAMS) Beijing 100020 China Beijing Advanced Innovation Centre for Biomedical Engineering Beihang University Beijing 102402 China Department of Cardiology Beijing Shijitan Hospital Capital Medical University Beijing 100038 China Department of Biomedical Engineering Zhejiang University Hangzhou 310027 China National Research Center for Rehabilitation Technical Aids Beijing 100176 China

Two clinical ablation protocols, 2C3L and stepwise, have been routinely used in our group to treat atrial fibrillation （AF）, but with a less than 60% long-term arrhythmia-free outcome achieved in patients. The goal of this study was to examine the underlying mechanism of low success in clinical outcome. MRI images from one patient were used to reconstruct a human atrial anatomical model, and fibrotic tissue was manually added to represent the arrhythmia substrate. AF was induced with standard protocols used in clinical practice. 2C3L and stepwise were then used to test the efficacy of arrhythmia termination in our model. The results showed that re-entries induced in our model could not be terminated by using either 2C3L or the stepwise protocol. Although some of the induced re-entries were terminated, others emerged in new areas. Ablation using only the 2C3L or stepwise method was not sufficient to terminate all re-entries in our model, which may partially explain the poor long-term arrhythmiafree outcomes in clinical practice. Our findings also suggest that computational heart modelling is an important tool to assist in the establishment of optimal ablation strategies.

关键词： computational modelling atrial fibrillation atrial ablation 2C3L stepwise

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Processing,microstructure,and properties of porous ceramic composites with directional channels

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Journal of Materials Science & Technology 2024年第1期168卷 1-15页

作者： bo Zhang Yang Yang Xueling fan Key Laboratory of Service Performance and Protection Technology in Extreme Environments Xi’an Jiaotong UniversityXi’an 710049China State Key Laboratory for Strength and Vibration of Mechanical Structures School of Aerospace EngineeringXi’an Jiaotong UniversityXi’an 710049China

Porous ceramic composites with directional microchannels from micrometer to dozens of micrometer levels have attracted more and more attention in various fields including aerospace,biomedicines,and thermal insulation due to their excellent fluid permeability,mechanical properties,*** this article,we summarize the recent directional porous ceramics developments including their main processing routes and respective ***,the properties get from different processing routes have been com-pared and analyzed in terms of microstructures,mechanical properties,and *** has been given to the deeper understanding which can allow one to control the microstructural features of these porous ceramic composites to obtain the desired *** work can provide a useful reference for the development and application of porous ceramic composites with directional microchan-nels.

关键词： Porous ceramic composites Directional microchannels Processing routes Permeability

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