Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine最新文献

{"title":"Torsional behavior of peripheral vascular stents: The role of stent design parameters.","authors":"Xiang Shen, Jiahao Chen, Yue Xu, Qiang Liu, Zewen He, Lei Wang, Peng Sun, Hongfei Zhu, Hengfeng Yan","doi":"10.1177/09544119251317621","DOIUrl":"10.1177/09544119251317621","url":null,"abstract":"<p><p>Torsional performance is a critical evaluation criterion in the design of peripheral vascular stents, enabling them to adapt to the deformation of the vessel to reduce damage to the vascular wall and thus avoiding in-stent restenosis (ISR). Therefore, this study employed the finite element method (FEM) to investigate the impact of stent design parameters on the torsional behavior of self-expanding peripheral vascular stents. These parameters included stent diameter and thickness, as well as the length and width of struts and links. Results revealed that among all parameters, strut length and width significantly influence the stent torsional performance, whereas link width has a lesser effect. Notably, increasing strut length and decreasing strut width were found to significantly reduce the required torque, with the twist metric (TM) reduced by approximately 86.3% when strut length increased from 1.2 to 2.8 mm. Moreover, reductions in stent diameter and thickness, alongside an increase in link length, further contributed to a decrease in TM, thereby enhancing the stent torsional performance. This study may provide insights for better peripheral stent design and clinical decision of stent choice.</p>","PeriodicalId":20666,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine","volume":" ","pages":"121-132"},"PeriodicalIF":1.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143441799","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}

{"title":"Chronic pain classification using PPG and ECG parameters selected via hybrid feature selection.","authors":"Jia-Hao Cai, De-Fu Jhang, Shih-Che Hung, Yu-Ting Tai, Chia-Yu Hsu, Chiung-Cheng Chuang","doi":"10.1177/09544119241309424","DOIUrl":"10.1177/09544119241309424","url":null,"abstract":"<p><p>Current chronic pain intensity assessment methods are large based on self-description, which is the gold-standard in clinical practice. However, for patients who lack communication ability or consciousness, this challenging task falls on medical staff. Our study aimed to develop a pain intensity classification system to perform this task automatically. Electrocardiogram and photoplethysmography (PPG) recordings from 43 patients with pain were analyzed with recordings from 20 healthy volunteers as a control group. A numerical rating scale was derived to assess pain intensity, which was divided into four categories of no pain, low pain, moderate pain, and severe pain as specific labels. To explore the robustness of PPG and heart rate variability (HRV) features, a hybrid feature selection (HFS) method was applied to identify important indicators based on majority rule. Additionally, a multi-class support vector machine (SVM) was utilized for classification with 10-fold cross validation. The overall estimation accuracy of the SVM for the four pain intensity levels was approximately 74.6%. It was determined that PPG and HRV features with HFS can provide sufficient information to discriminate different pain intensities in myofascial chronic pain patients. Additionally, our study yielded a novel perspective regarding the trends of PPG features in clinical practice.</p>","PeriodicalId":20666,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine","volume":" ","pages":"227-235"},"PeriodicalIF":1.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143503761","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}

{"title":"Analysis and optimization of cortical bone drilling process based on stochastic optimization.","authors":"Ghodratollah Taheri, Reza Saeidi Abueshaghi, Farbod Setoudeh, Vahid Tahmasbi, Mohammad Mohammadian","doi":"10.1177/09544119251321134","DOIUrl":"10.1177/09544119251321134","url":null,"abstract":"<p><p>The process of bone drilling is essential in orthopedic surgery and fracture treatment, involving the machining of anisotropic composite materials that exhibit significant hardness and strength. This technique is commonly employed to access underlying tissues, place implants, or remove damaged tissue. However, the challenging nature of this process can lead to high shear forces and elevated temperatures, which pose a risk of thermal necrosis - a condition that damages bone tissue due to excessive heat generated during surgery. When drilling temperatures exceed the critical threshold of 47°C, it can result in the death of bone tissue cells, contributing to micro-cracks, and layering within the bone structure. This study examines the effects of key drilling parameters - rotational speed, feed rate, and tool diameter - and is divided into two main sections: laboratory experiments and statistical modeling using Analysis of Variance (ANOVA). A sensitivity analysis was also performed to assess how optimal parameter values influence output temperature. The results emphasize the significance of temperature control during the drilling process and demonstrate that optimizing these parameters greatly improves bone drilling procedures.To manage temperature effectively, researchers employed the Simultaneous Perturbation Stochastic Approximation (SPSA) optimization algorithm, recognized for its high accuracy and efficiency. Laboratory drilling tests were carried out using the optimal values derived from this optimization process, confirming its effectiveness. Additionally, the findings indicate that temperature fluctuations are influenced by the type of bone, its softness or hardness, and the inherent properties of anisotropic composite materials, which can also contribute to higher temperatures during drilling. Overall, this research underscores the vital importance of parameter optimization in enhancing outcomes in orthopedic applications and reducing the risks associated with thermal necrosis.</p>","PeriodicalId":20666,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine","volume":" ","pages":"178-189"},"PeriodicalIF":1.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143625661","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}

{"title":"A proposal to analyze muscle fiber type composition in the soleus muscle of untrained subjects and sprinters using surface EMG signals.","authors":"Venugopal Gopinath, Manuskandan Swaminathan Ramakrishnan, Remya R Nair, Ramakrishnan Swaminathan","doi":"10.1177/09544119251321129","DOIUrl":"10.1177/09544119251321129","url":null,"abstract":"<p><p>Muscle fiber type proportion is a key determinant of fatigue, force generation, and functions of different skeletal muscles. Analysis of muscle fiber type composition aids in the assessment of athletic abilities and individualization of training methods. This study attempts to non-invasively analyze the muscle fiber type composition in the soleus (SOL) of untrained subjects (UT) and sprinters (SP) using surface electromyography-based time-frequency analysis. Signals are recorded from both groups during an isometric calf raise test with loads until fatigue. Filtered signals are segmented into epochs of 1-s duration and processed using a reassigned Morlet scalogram. Four time-frequency features namely averaged frequency, squared frequency bandwidth, averaged time, and squared time duration are extracted from the reassigned distribution and are subjected to linear regression analysis. A fiber-type-specific reassigned profile is noticed for UT and SP reflecting their distinct muscle composition during their non-fatigue and fatigue states. The regression parameters namely slope, intercept, and Adjusted R-square values are higher for the signals of SP indicating their fast-fatigue characteristics. Greater variation of features during fatigue is noticed in the signals of UT compared to SP. Among the features, the squared time duration exhibits the highest significance of <i>p</i> = 8.75E-07 in differentiating the signals of UT and SP during the non-fatigue state. Thus, the proposed approach is found suitable for analyzing the fiber type differences in both subject groups. This work may be further extended in sports biomechanics for studying the fiber-type transformations in muscles due to different athletic training strategies.</p>","PeriodicalId":20666,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine","volume":" ","pages":"144-154"},"PeriodicalIF":1.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143543119","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}

{"title":"Rings in Taylor Spatial Frame: Mechanical testing and finite element analysis.","authors":"Ahmad Zamani, Michalis Zenios, S Olutunde Oyadiji","doi":"10.1177/09544119251321128","DOIUrl":"10.1177/09544119251321128","url":null,"abstract":"<p><p>Taylor Spatial Frame (TSF) is a type of hexapod external ring fixation system. TSF rings are supplied as half rings, whole full rings and two third rings in different sizes. In this work, these components as well as bolted full rings made of two half rings were tested in compression in two or three directions. Tests were simulated by Finite Element (FE) method using 3D solid elements, which were validated against the experimental results. Load-deflection curves and values for stiffness and ultimate loads are presented for each case from both tests and FE analyses. Load-stiffness curves are also presented for each test. The followings were demonstrated by the results: (1) a significant difference between bolted and whole full rings in their respective stiffness behaviour, the clear advantage being with the whole full rings, (2) a variation in stiffness of bolted rings when loaded across their different diameters, (3) a potential problem in the TSF rings: having the same cross section and thickness, smaller rings are stronger than larger ones, whereas in fact the larger ones ought to be stronger due to patient's weight and that (4) the lowest stiffness was exhibited when a 2/3 ring was loaded parallel to the line joining its open ends.</p>","PeriodicalId":20666,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine","volume":" ","pages":"165-177"},"PeriodicalIF":1.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11907730/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143625677","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}

{"title":"Computational study on the effect of thermal deformation of myocardium on lesion formation during radiofrequency ablation.","authors":"Pei Xin Niu, Xiang Xiang Wang, Jing Jin Shen, Xiao Xiao Jin, Zhen Yu Zhou","doi":"10.1177/09544119251321131","DOIUrl":"10.1177/09544119251321131","url":null,"abstract":"<p><p>Radiofrequency (RF) catheter ablation treats cardiac diseases by inducing thermal lesion of cardiac tissues through radiofrequency energy operating at around 500 kHz. The electromagnetic wavelength is significantly longer than the size of the radiofrequency active electrode, the tissue is heated through resistive heating. During thermal ablation, the coupled thermo-mechanical property of cardiac tissue influencing the contact area between the electrode and tissue plays a crucial role in the formation of thermal lesions, yet the literature often overlooks the effect of thermal deformation. This paper proposes a thermo-hyperelastic constitutive model for myocardium that models thermal contraction and expansion during ablation. Furthermore, a finite element model was established to investigate the effect of the electro-thermo-mechanical coupling property of myocardium on lesion formation under different contact forces. To ensure convergence, we solved the fully coupled electro-thermo-mechanical finite element model using the segregated step method. The computational results demonstrate that thermal deformation, which causes an expansion in the tissue-electrode contact area, increases lesion width and volume, while its influence on lesion depth is negligible. Specifically, after a 30-s ablation under contact forces of 0.1, 0.15, and 0.2 N, the lesion volume increased from 4.53, 7.66, and 10.62 mm³ (without thermo-mechanical coupling) to 5.36, 8.33, and 13.34 mm³ (with thermo-mechanical coupling), respectively. Similarly, the lesion width increased from 2.68, 3.12, and 3.44 mm to 2.78, 3.22, and 3.62 mm. Moreover, both thermal deformation and contact force exert a minimal effect on lesion formation time.</p>","PeriodicalId":20666,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine","volume":" ","pages":"133-143"},"PeriodicalIF":1.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143516493","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}

{"title":"Development and validation of an automated Trunk Impairment Scale 2.0 scoring system using rule-based classification.","authors":"Tay Jia Yi, Zaidi Mohd Ripin, Mohamad Ikhwan Zaini Ridzwan, Muhammad Fauzinizam Razali, Yeo Ying Heng, Nur Akasyah Binti Jaafar, Alexander Tan Wai Teng, Hazwani Binti Ahmad Yusof, Muhammad Hafiz Hanafi","doi":"10.1177/09544119251317614","DOIUrl":"10.1177/09544119251317614","url":null,"abstract":"<p><p>The Trunk Impairment Scale Version 2.0 (TIS 2.0) measures the motor impairment of the trunk after a stroke through the evaluation of dynamic sitting balance and co-ordination of trunk movement. Evaluations by physiotherapists depend on their ability in detecting minor changes in motion and observing limb movements and these can be time consuming and reduce their availability for rehabilitation work. An automated scoring system for TIS 2.0 was proposed to provide a more reproducible and standardized alternative to manual physiotherapist assessments. In the development phase, motion data from lay actors simulating stroke condition were collected using video motion capture system OpenCap. This data was utilized to create metrics and establish cut-off values for a rule-based classification. The discriminant abilities of the metrics were evaluated using the area under the curve (AUC). In the testing phase, the performance of the developed system was assessed on 19 stroke survivors (Berg Balance Scale score of 20-55) using both automated system and manual scoring by nine physiotherapists. The discriminant abilities of the features used in the dynamic sitting balance subscale are considered excellent to outstanding (AUC ≥ 0.717), and coordination subscale ranged from poor to outstanding (AUC ≥ 0.667). The automated scores aligned with physiotherapists' scores, achieving an average percentage of agreement 71.1%. The total TIS 2.0 scores generated by the automated method showed moderate correlation with the sum of mode-determined task scores (<i>R</i> = 0.526, <i>p</i> < 0.05). These findings suggest that the proposed automated system demonstrates comparable validity to assessments by physiotherapists.</p>","PeriodicalId":20666,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine","volume":" ","pages":"212-226"},"PeriodicalIF":1.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143441797","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}

{"title":"Effects of self-expandable pedicle screws with shape memory alloy structures on spinal fixation strength: A finite element study.","authors":"Mahdi Mohammad Asghari, Aisa Rassoli, Hedayeh Mehmanparast","doi":"10.1177/09544119241298535","DOIUrl":"10.1177/09544119241298535","url":null,"abstract":"<p><p>In many spine surgeries, pedicle screws are commonly used to stabilize vertebrae, however, loosening can be a complication. Different designs have shown improvements in fixation strength, with self-expandable screws featuring shape memory alloy (SMA) structures being of particular interest. This study aimed to assess the fixation strength of self-expandable pedicle screws made with SMA (specifically Nickel-Titanium) sheets. Three types of screws were evaluated: self-expandable screws with a smooth SMA surface, self-expandable screws with a porous SMA surface, and standard design screws. Each screw underwent pullout tests for comparison. Following the tests, the self-expandable screw with a porous surface exhibited the highest pullout force (1141.83 N), compared to 1056.86 N for the smooth self-expandable screw and 1104.25 N for the standard screw. The dissipated plastic strain energy differed among the screws, with values of 0.073 J for the porous self-expandable screw, 0.065 J for the smooth self-expandable screw, and 0.089 J for the standard pedicle screw. Notably, the porous self-expandable screw showed reduced stress on the bone-screw interface. Improving the mechanical design of pedicle screws could significantly enhance screw-bone fixation strength. The utilization of self-expandable pedicle screws with porous surface SMA sheets demonstrates superior performance, potentially mitigating complications like loosening.</p>","PeriodicalId":20666,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine","volume":" ","pages":"29-36"},"PeriodicalIF":1.7,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142695721","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}

{"title":"Retracted: Optimized lung tumor diagnosis system using enhanced version of crow search algorithm, Zernike moments, and support vector machine.","authors":"Yihao Luo, Long Zhang, Ruoning Song, Chuang Zhu, Jie Yang, Benjamin Badami","doi":"10.1177/09544119211055870","DOIUrl":"10.1177/09544119211055870","url":null,"abstract":"","PeriodicalId":20666,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine","volume":" ","pages":"NP2-NP11"},"PeriodicalIF":1.7,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"39679814","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}

{"title":"Investigating the bacterial cleaning performance on Zr-BMG with LIPSS after ultrasonic vibration assisted cleaning.","authors":"Songlin Li, Kekang Mo, Cezhi Du","doi":"10.1177/09544119241303307","DOIUrl":"10.1177/09544119241303307","url":null,"abstract":"<p><p>High-efficiency and high-quality sterilization technologies for medical materials can significantly reduce iatrogenic infection. This study investigates the synergistic effects of laser-induced periodic surface structures (LIPSS) and ultrasonic cleaning on the removal of bacteria from medical material surfaces. We specifically examined how ultrasonic parameters and structural defects in LIPSS impact the effectiveness of bacterial removal. As an emerging medical metal, Zr-BMG was chosen for the target material. Femtosecond laser processing was employed to create LIPSS with both complete linear arrays and discontinuous linear arrays structures featuring surface defects by adjusting the scanning overlap rate. A high-concentration solution of S. aureus was used for co-cultivation, resulting in a surface bacterial coverage rate exceeding 95%. The study analyzed the synergistic sterilization effect of microstructured surfaces through variations in ultrasonic cleaning power and duration. The results indicated that surfaces with microstructures demonstrated significantly improved bacterial removal following ultrasonic cleaning. The bacterial removal rate was found to be proportional to the ultrasonic vibrator power, and the surface with a LIPSS structure outperformed the discontinuous LIPSS surface in bacterial removal efficiency. Optimal results were achieved with the LIPSS surface after 30 min of cleaning at 100 W ultrasonic power. However, there was minimal difference in bacterial removal between 10 and 30 min at the same power level. This study aims to provide methodological insights and data support for the efficient and high-quality cleaning of medical metal surfaces.</p>","PeriodicalId":20666,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine","volume":" ","pages":"106-117"},"PeriodicalIF":1.7,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142814094","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}