Medical Engineering & Physics最新文献

New training simulator for lumbar puncture base on magnetorheological 基于磁流变技术的新型腰椎穿刺培训模拟器

IF 1.7 4区医学

Medical Engineering & Physics Pub Date : 2024-09-16 DOI: 10.1016/j.medengphy.2024.104240

{"title":"New training simulator for lumbar puncture base on magnetorheological","authors":"","doi":"10.1016/j.medengphy.2024.104240","DOIUrl":"10.1016/j.medengphy.2024.104240","url":null,"abstract":"<div><p>In response to the difficulties in accurately reproducing the resistance drop generated by puncturing key tissue layers with a needle and the poor experience in existing simulators, based on the continuous controllability and rapid response of magnetorheological fluid under the influence of a magnetic field, this paper proposes a lumbar puncture training simulator(LPTS) that can accurately simulate the puncture feedback force within tissues such as the skin, subcutaneous fat, and supraspinous ligament throughout the entire process. By using a dual rod structure and reasonably arranging the damping channel gap, the influence of mechanical friction and zero-field damping force on the feedback force during tissue progression is minimized. This paper introduces the acquisition and modeling analysis of raw data, and based on this, the design, simulation, and mechanical testing of the simulator are carried out. Finally, a performance testing platform for the simulator is established to evaluate its tracking performance of the expected puncture strength and the reproducibility of the puncture sensation. The results show that the experimental puncture strength deviates from the expected puncture strength by 0.35 N to 0.61 N in the crucial steps of breaking through the supraspinous ligament, interspinous ligament, ligamentum flavum, and dura mater, with a relative error below 10 %.</p></div>","PeriodicalId":49836,"journal":{"name":"Medical Engineering & Physics","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142271529","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

Crack propagation in TPMS scaffolds under monotonic axial load: Effect of morphology 单调轴向载荷下 TPMS 支架的裂纹扩展：形态的影响

IF 1.7 4区医学

Medical Engineering & Physics Pub Date : 2024-09-03 DOI: 10.1016/j.medengphy.2024.104235

引用次数: 0

Active constraint control for the surgical robotic platform with concentric connector joints 带同心连接器关节的手术机器人平台的主动约束控制

IF 1.7 4区医学

Medical Engineering & Physics Pub Date : 2024-09-02 DOI: 10.1016/j.medengphy.2024.104236

引用次数: 0

Computer simulation of low-power and long-duration bipolar radiofrequency ablation under various baseline impedances 计算机模拟各种基线阻抗下的低功率和长时间双极射频消融术

IF 1.7 4区医学

Medical Engineering & Physics Pub Date : 2024-09-01 DOI: 10.1016/j.medengphy.2024.104226

{"title":"Computer simulation of low-power and long-duration bipolar radiofrequency ablation under various baseline impedances","authors":"","doi":"10.1016/j.medengphy.2024.104226","DOIUrl":"10.1016/j.medengphy.2024.104226","url":null,"abstract":"<div><p>Compared to traditional unipolar radiofrequency ablation (RFA), bipolar RFA offers advantages such as more precise heat transfer and higher ablation efficiency. Clinically, myocardial baseline impedance (BI) is one of the important factors affecting the effectiveness of ablation. We aim at finding suitable ablation protocols and coping strategies by analyzing the ablation effects and myocardial impedance changes of bipolar RFA under different BIs. In this research, a three-dimensional local myocardial computer model was constructed for bipolar RFA simulation, and <em>in vitro</em> experimental data were used to validate accuracy. Four fixed low-power levels (20 W, 25 W, 30 W, and 35 W) and six myocardial BIs (91.02 Ω, 99.83 Ω, 111.03 Ω, 119.77 Ω, 130.03 Ω, and 135.45 Ω) were set as initial conditions, with an ablation duration of 120-s. In the context of low-power and long-duration (LPLD) ablation, the maximum TID (TID<sub>M</sub>) decreased by 21–32 Ω, depending on the BI. In cases where steam pop did not occur, TID<sub>M</sub> increased with the increase in power. For the same power, there was no significant difference in TID<sub>M</sub> for the range of BIs. In cases where steam pop occurred, for every 1 Ω increase in BI, TID<sub>M</sub> increased by 0.34–0.41 Ω. The simulation results also showed that using a higher power resulted in a smaller decrease in TID<sub>M</sub>. This study provided appropriate ablation times and impedance decrease ranges for bipolar LPLD RFA. The combination of 25 W for 120-s offered optimal performance when considering effectiveness and safety simultaneously.</p></div>","PeriodicalId":49836,"journal":{"name":"Medical Engineering & Physics","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142096555","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

Real-time identification of noise type contaminated in surface electromyogram signals using efficient statistical features 利用高效统计特征实时识别表面肌电信号中受污染的噪声类型

IF 1.7 4区医学

Medical Engineering & Physics Pub Date : 2024-09-01 DOI: 10.1016/j.medengphy.2024.104232

引用次数: 0

Analysis of the milling response of an artificial temporal bone developed for otologic surgery in comparison with human cadaveric samples 用于耳科手术的人工颞骨的铣削反应分析与人体样本的比较

IF 1.7 4区医学

Medical Engineering & Physics Pub Date : 2024-09-01 DOI: 10.1016/j.medengphy.2024.104220

{"title":"Analysis of the milling response of an artificial temporal bone developed for otologic surgery in comparison with human cadaveric samples","authors":"","doi":"10.1016/j.medengphy.2024.104220","DOIUrl":"10.1016/j.medengphy.2024.104220","url":null,"abstract":"<div><p>Temporal-bone milling is a delicate process commonly performed during otologic surgery to gain access to the middle and inner ear structures. Because of the numerous at-risk structures of this anatomic area, extensive surgeon training is required. Artificial temporal bones offer an interesting alternative to cadaveric training. However, the evaluation of such simulators has not been systematic, with an absence of objective validation of their milling response, especially in a surgical context.</p><p>By measuring the milling forces obtained during the classical steps of otologic surgery on six 3D-printed and three cadaveric temporal bones, this work aims at evaluating the ability of the OTOtwin® synthetic temporal bone to reproduce human bone behavior.</p><p>A better repeatability was obtained for artificial bones than for cadaveric ones. However, the level of forces recorded during artificial bone milling was close to the one measured with cadaveric samples. The effects of both surgical phase and irrigation on milling force levels were also quantified. The experiments conducted in this study confirmed the suitability of OTOtwin® temporal bone model for both otologic surgery training and research purposes. Valuable insights were also gained from this study regarding the understanding of the otologic milling process.</p></div>","PeriodicalId":49836,"journal":{"name":"Medical Engineering & Physics","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1350453324001218/pdfft?md5=2deb85e5c06eb5586c9156c86dde09ac&pid=1-s2.0-S1350453324001218-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142096838","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An optimal fast fractal method for breast masses diagnosis using machine learning 利用机器学习诊断乳腺肿块的最佳快速分形法

IF 1.7 4区医学

Medical Engineering & Physics Pub Date : 2024-08-23 DOI: 10.1016/j.medengphy.2024.104234

引用次数: 0

The effects of setup parameters on the measured kinetic output of cervical disc prostheses 设置参数对颈椎椎间盘假体动力输出测量值的影响

IF 1.7 4区医学

Medical Engineering & Physics Pub Date : 2024-08-22 DOI: 10.1016/j.medengphy.2024.104227

{"title":"The effects of setup parameters on the measured kinetic output of cervical disc prostheses","authors":"","doi":"10.1016/j.medengphy.2024.104227","DOIUrl":"10.1016/j.medengphy.2024.104227","url":null,"abstract":"<div><p>Mechanical testing machines are used to evaluate kinematics, kinetics, wear, and efficacy of spinal implants. The simulation of \"physiological\" spinal loading conditions necessitates the simultaneous use of multiple actuators. The challenge in achieving a desired loading profile lies in achieving close synchronization of these actuators. Errors in load application can be attributed to both the control system and the intrinsic sample response. Moreover, the presence of friction in the setup can have an impact on the measured outcome. The optimization of setup parameters can substantially improve the ability to simulate spinal loading conditions and obtain reliable data on implant performance. In this study, a reproducible kinematic test protocol was developed to evaluate the sensitivity of the kinetic response (i.e., measured loads, moments, and stiffnesses) of a cervical disc prosthesis to several testing parameters. In this context, five ceramic ball and socket sample implants were mounted in a 6 DOF material testing machine and tested with a constant axial compressive force of 100 N in two motion modes: 1) flexion-extension (±7.5°) and 2) lateral bending (±6°). Parameters including rotation rate, slider friction, friction between the samples' articulating surfaces, and moment arm were considered to determine their effects on measured kinetic parameters. The sensitivity analysis indicated that all setup parameters except friction between the samples' articulating surfaces had a substantial effect on the results. The findings were then compared to predictions from a free body diagram to determine the optimal setup parameters. Consequently, the setup with the lowest rotation rate and employing passive sliders yielded results that were consistent with the free body diagram. This study demonstrated the significance of a comprehensive setup evaluation for reliable and reproducible testing of spinal implants, also for comparison between labs.</p></div>","PeriodicalId":49836,"journal":{"name":"Medical Engineering & Physics","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142041059","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

Development of a mechanical characterisation device for intracranial aneurysms: Calibration on polymeric phantom arteries 开发颅内动脉瘤机械特性分析装置：在聚合物模型动脉上进行校准

IF 1.7 4区医学

Medical Engineering & Physics Pub Date : 2024-08-20 DOI: 10.1016/j.medengphy.2024.104225

{"title":"Development of a mechanical characterisation device for intracranial aneurysms: Calibration on polymeric phantom arteries","authors":"","doi":"10.1016/j.medengphy.2024.104225","DOIUrl":"10.1016/j.medengphy.2024.104225","url":null,"abstract":"<div><p>Intracranial aneurysm is a major health issue related to biomechanical arterial wall degradation. Currently, no method allows predicting rupture risk based on <em>in vivo</em> quantitative mechanical data. This work is part of a large-scale project aimed at providing clinicians with a non-invasive patient-specific decision support tool, based on the <em>in vivo</em> mechanical characterisation of the aneurysm wall. Thus, the primary objective of the project was to develop a deformation device prototype (DDP) of the artery wall and to calibrate it on polymeric phantom arteries. The deformations induced on the phantom arteries were quantified experimentally using a Digital Image Correlation (DIC) system. The results indicated that the DIC system was able to measure the small displacements generated by the DDP. We also observed that the flow mimicking the blood flow did not significantly disturb the measurements of the artery wall displacement caused by the DDP. Finally, a limit displacement value generated by the DDP was evaluated. This value corresponds to the lowest displacement value detectable by the clinical imaging system that will be tested on animals in the future (Spectral Photon Counting CT).</p></div>","PeriodicalId":49836,"journal":{"name":"Medical Engineering & Physics","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142050435","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

Towards a reduced order model for EVAR planning and intra-operative navigation 建立用于 EVAR 计划和术中导航的减阶模型

IF 1.7 4区医学

Medical Engineering & Physics Pub Date : 2024-08-16 DOI: 10.1016/j.medengphy.2024.104229

{"title":"Towards a reduced order model for EVAR planning and intra-operative navigation","authors":"","doi":"10.1016/j.medengphy.2024.104229","DOIUrl":"10.1016/j.medengphy.2024.104229","url":null,"abstract":"<div><h3>Introduction</h3><p>The pre-operative planning and intra-operative navigation of the endovascular aneurysm repair (EVAR) procedure are currently challenged by the aortic deformations that occur due to the insertion of a stiff guidewire. Hence, a fast and accurate predictive tool may help clinicians in the decision-making process and during surgical navigation, potentially reducing the radiations and contrast dose. To this aim, we generated a reduced order model (ROM) trained on parametric finite element simulations of the aortic wall-guidewire interaction.</p></div><div><h3>Method</h3><p>A Design of Experiments (DOE) consisting of 300 scenarios was created spanning over seven parameters. Radial basis functions were used to achieve a morphological parametrization of the aortic geometry. The ROM was built using 200 scenarios for training and the remaining 100 for validation.</p></div><div><h3>Results</h3><p>The developed ROM estimated the displacement of aortic nodes with a relative error below 5.5% for all the considered validation cases. From a preliminary analysis, the aortic elasticity, the stiffness of the guidewire and the tortuosity of the cannulated iliac artery proved to be the most influential parameters.</p></div><div><h3>Conclusions</h3><p>Once built, the ROM provided almost real-time and accurate estimations of the guidewire-induced aortic displacement field, thus potentially being a promising pre- and intra-operative tool for clinicians.</p></div>","PeriodicalId":49836,"journal":{"name":"Medical Engineering & Physics","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1350453324001309/pdfft?md5=e31c28cf4d82238e7951b8a62951ea41&pid=1-s2.0-S1350453324001309-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142084093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0