Advances in Bioengineering最新文献_第10页

Effects of Anterior Spinal Instrumentation on Single-Level Cervical Graft Mechanics 脊柱前路内固定对单节段颈椎移植物力学的影响

Advances in Bioengineering Pub Date : 2001-11-11 DOI: 10.1115/imece2001/bed-23035

D. DiAngelo, Weiqiang Liu, B. Kelly, K. Foley

{"title":"Effects of Anterior Spinal Instrumentation on Single-Level Cervical Graft Mechanics","authors":"D. DiAngelo, Weiqiang Liu, B. Kelly, K. Foley","doi":"10.1115/imece2001/bed-23035","DOIUrl":"https://doi.org/10.1115/imece2001/bed-23035","url":null,"abstract":"\u0000 Anterior cervical discectomy with or without graft fusion is an acceptable surgical method for the treatment of cervical spondylosis or other spinal disc diseases. A graft-alone or graft with supplemental spinal instrumentation may be used to immobilize the operated/injured region to promote bony fusion. Graft fusion with instrumentation is intended to restore the mechanical integrity of the operated spine and decrease graft complications. Although the surgical procedure should restore the mechanical integrity of the operated spine, little is known of the load-sharing mechanics of single-level grafted constructs. We have previously shown that anterior instrumentation reverses the loading mechanics of a multi-level cervical strut-graft tested under physiologic flexion and extension conditions (DiAngelo et al., 2000). We hypothesize that a single-level anterior cervical plate will function in a similar manner. That is, a single-level anterior cervical plate will reverse the loads on the graft by loading the graft in extension and unloading the graft in flexion. We also hypothesize that a graft-alone construct does not provide adequate stabilization comparable to that of the graft-plated condition tested in flexion and extension. The objective of the study was to determine the biomechanical stability of four different spine conditions tested under physiologic flexion and extension conditions. They included the harvested, discectomized, graft-alone, and graft with single-level anterior cervical plate.","PeriodicalId":7238,"journal":{"name":"Advances in Bioengineering","volume":"106 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2001-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80410404","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

3-D Simulation for Blood Flow and Artery Compression in Asymmetric Stenotic Arteries With Axial Stretch 不对称狭窄动脉轴向拉伸血流和动脉压迫的三维模拟

Advances in Bioengineering Pub Date : 2001-11-11 DOI: 10.1115/imece2001/bed-23124

D. Tang, Chun Yang, S. Kobayashi

{"title":"3-D Simulation for Blood Flow and Artery Compression in Asymmetric Stenotic Arteries With Axial Stretch","authors":"D. Tang, Chun Yang, S. Kobayashi","doi":"10.1115/imece2001/bed-23124","DOIUrl":"https://doi.org/10.1115/imece2001/bed-23124","url":null,"abstract":"\u0000 There has been increasing evidence that severe stenosis may cause artery compression and plaque cap rupture leading to heart attack and stroke. The physiological conditions under which that may occur and mechanisms involved are not well understood. It has been known that severe stenosis causes critical flow and wall mechanical conditions such as flow limitation, flow separation, low and oscillating shear stress distal to the stenosis, high shear stress and low or even negative flow pressure at the throat of stenosis, artery compression or even collapse. Those conditions are related to limitation of blood supply, intimal thickening and thrombosis formation, endothelism damage, platelet activation and aggregation, plaque cap rupture (for review, see [1,2]). Due to the complexity of the problem and lack of experimental data for mechanical properties of arteries under both expansion and compression, previous models were limited primarily to flow behaviors and with various limitations (axisymmetry, rigid wall, small strain, small pressure gradient). In this paper, experimental data for artery mechanical properties under physiological conditions were measured and a 3-d computational model is introduced to investigate flow behaviors and wall stress and strain distributions with fluid-structure interactions to better understand the mechanism involved in artery compression and plaque cap rupture.","PeriodicalId":7238,"journal":{"name":"Advances in Bioengineering","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2001-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86159085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design of a Vibrating Fiber Display for a Wearable Low Vision Aid 一种用于可穿戴低视力辅助设备的振动纤维显示器设计

Advances in Bioengineering Pub Date : 2001-11-11 DOI: 10.1115/imece2001/bed-23094

S. Frank, E. Seibel

引用次数: 4

ABAQUS Finite Element Models of Convective Transport in the Walls of Arteries Subjected to Steady and Pulsatile Pressure 稳定压力和脉动压力作用下动脉壁上对流输送的ABAQUS有限元模型

Advances in Bioengineering Pub Date : 2001-11-11 DOI: 10.1115/imece2001/bed-23125

B. Simon, P. Rigby, S. K. Williams

引用次数: 0

Metal Trays in Tibial Components of Knee Implants; Contact Stress and Deflection Behaviour 金属托盘在膝关节植入物胫骨构件中的应用接触应力和挠曲行为

Advances in Bioengineering Pub Date : 2001-11-11 DOI: 10.1115/imece2001/bed-23090

T. McGloughlin

引用次数: 0

Response Analysis of Passive Human Knee Joint in Flexion Under Anterior-Posterior Loads 前后载荷作用下被动屈曲膝关节的响应分析

Advances in Bioengineering Pub Date : 2001-11-11 DOI: 10.1115/imece2001/bed-23072

K. Moglo, A. Shirazi-Adl

引用次数: 0

Rising Crack-Growth-Resistance Behavior in Cortical Bone: Implications for Toughness Measurements 皮质骨的抗裂纹生长行为:对韧性测量的影响

Advances in Bioengineering Pub Date : 2001-11-11 DOI: 10.1115/imece2001/bed-23027

D. Vashishth

引用次数: 13

Decision-Based Design of a Wearable Low Vision Aid 基于决策的可穿戴低视力辅助设备设计

Advances in Bioengineering Pub Date : 2001-11-11 DOI: 10.1115/imece2001/bed-23096

E. Seibel, S. Frank, K. Kloeckner, T. Furness

{"title":"Decision-Based Design of a Wearable Low Vision Aid","authors":"E. Seibel, S. Frank, K. Kloeckner, T. Furness","doi":"10.1115/imece2001/bed-23096","DOIUrl":"https://doi.org/10.1115/imece2001/bed-23096","url":null,"abstract":"\u0000 The design of a wearable low vision aid (WLVA) encompasses a wide range of design variables and made more complex by rapidly changing camera, micro-display, and computer technologies, and with the unique needs of the partially sighted user. Many of the WLVA design challenges have been documented by Massof [1] using miniature cathode ray tube (CRT) displays. Our goal.is to develop new scanning light micro-displays for low-cost WLVAs. Originally proposed by Peli [2], we are designing WLVAs that scan light from a laser or light emitting diode (LED), directly toward the eye. As the light beam raster scans across the retina, the mind perceives it as a full image. This display technology is called retinal light scanning, which produces images of high brightness from the laser or LED source and great depth-of-focus because of the narrow beam of light. A recent reading performance study demonstrated significantly higher reading rates of a minority of partially sighted individuals using a retinal scanning Virtual Retinal Display (VRD) versus a CRT [3]. We are in the process of researching low-cost optical scanners [4], novel human interface designs [5], and a computer-aided, decision-based design process to aid in the development of WLVAs. The initial results from our computer-aided design process are presented here.","PeriodicalId":7238,"journal":{"name":"Advances in Bioengineering","volume":"62 2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2001-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88678871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Simulation and Control of a Robotic/UFS Testing System With Application to Lumbar Spine Biomechanics 机器人/UFS测试系统的仿真与控制及其在腰椎生物力学中的应用

Advances in Bioengineering Pub Date : 2001-11-11 DOI: 10.1115/imece2001/bed-23081

T. Doehring, L. Gilbertson, James D. Kang

引用次数: 0

Investigation of Coronary Artery Stenosis Hemodynamics Using Experimental and Computational Models: Influence of Flowrate, Size, Symmetry and Wall Roughness 冠状动脉狭窄血流动力学的实验和计算模型研究:流量、大小、对称性和壁粗糙度的影响

Advances in Bioengineering Pub Date : 2001-11-11 DOI: 10.1115/imece2001/bed-23135

C. Egelhoff, R. Budwig, J. K. Foster, B. L. Hansen

引用次数: 2