Proceedings of the 1996 Fifteenth Southern Biomedical Engineering Conference最新文献_第7页

Development of a mobility assist for the paralyzed, amputee, and spastic patient 为瘫痪、截肢和痉挛患者开发活动辅助装置

Proceedings of the 1996 Fifteenth Southern Biomedical Engineering Conference Pub Date : 1996-03-29 DOI: 10.1109/SBEC.1996.493115

D.C. Johnson, D. Repperger, G. Thompson

{"title":"Development of a mobility assist for the paralyzed, amputee, and spastic patient","authors":"D.C. Johnson, D. Repperger, G. Thompson","doi":"10.1109/SBEC.1996.493115","DOIUrl":"https://doi.org/10.1109/SBEC.1996.493115","url":null,"abstract":"An exoskeleton system is being developed to aid in the mobilization of walking-impaired patients. New approaches to personal robotic assists have solved many classic problems with weight, power, endurance, and cost. A versatile platform of development allows for many variations and applications including mobility assist for the paralyzed, amputee, and spastic patient (MAPAS). A variety of strap on supports and braces are used, depending on the magnitude of the forces required. The MAPAS system utilizes compressed gas to power the main force producing elements, or muscles. Pneumatic muscles are used to provide controllable joint torque with moderate levels of pressure. These muscles are mounted to the brace, providing pull-only torque to joints. The MAPAS control system features interpreted joint mapping. The function of each leg joint is primarily directed through the output of a finger joint sensor. A six to eight sensor hand goniometer provides the system with user input. Higher control features actuated by on-board intelligent devices enable finger joint inputs to be enhanced providing balance, gait anticipation, fault-recovery, and spasm signature compensation. Ambient pressure levels of on-board reservoirs can be changed to suit changing environments ranging from heavily loaded amputee walking up stairs to the slight correction of a mild spasm. The entire system is portable with on-board batteries, compressed air reservoirs, intelligent algorithms, and goniometric sensors.","PeriodicalId":294120,"journal":{"name":"Proceedings of the 1996 Fifteenth Southern Biomedical Engineering Conference","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132424741","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: 35

A numerical study of flow over mild stenoses 轻度狭窄处流动的数值研究

Proceedings of the 1996 Fifteenth Southern Biomedical Engineering Conference Pub Date : 1996-03-29 DOI: 10.1109/SBEC.1996.493122

N. Mapara, D. Steinman, D. Holdsworth, M. R. Roach

{"title":"A numerical study of flow over mild stenoses","authors":"N. Mapara, D. Steinman, D. Holdsworth, M. R. Roach","doi":"10.1109/SBEC.1996.493122","DOIUrl":"https://doi.org/10.1109/SBEC.1996.493122","url":null,"abstract":"The hemodynamic effects of arterial geometry may play a role in the localization of atherosclerosis. Various arterial geometries have been modelled to obtain local blood flow profiles in bifurcations, bends, and vessels with major stenoses. Separation zones, which may have important implications in atherogenesis, are associated with local flow and pressure disturbances due to changes in spatial geometry. Atherosclerotic plaque may cause flow disturbances such as separation zones which may lead to the growth of the initial plaque, or the initiation of another plaque downstream. In this study, steady and pulsatile flow through tubular arteries with axisymmetric stenoses of a 5% diameter reduction, and stenoses lengths of 0.5 and 0.25 diameters were studied using a numerical simulation. Flow was modelled using FIDAP, a finite element analysis program, and the wall of the arteries were assumed to be rigid with Newtonian blood flow. Steady flow studies showed the existence of a critical separation Reynolds number required before a vortex was formed downstream of the lesion. No significant recirculation was observed proximal to the lesion. Pulsatile flow studies with an infrarenal waveform (/spl alpha/=11, Re=333) showed no vortex during early systole. However, after peak systole and during diastole, separation zones were observed for the stenosed vessels. In the last part of systole, a vortex formed distal to the stenoses. During diastole, a vortex was observed both proximal and distal to the stenoses. The complex now patterns observed were a result of the mild stenoses and could be an important factor in the propagation and generation of atherosclerotic lesions.","PeriodicalId":294120,"journal":{"name":"Proceedings of the 1996 Fifteenth Southern Biomedical Engineering Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114242916","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

Effect of aprotinin on blood loss and myocardial damage in patients undergoing aortocoronary bypass surgery 抑肽蛋白对冠状动脉搭桥术患者失血及心肌损害的影响

Proceedings of the 1996 Fifteenth Southern Biomedical Engineering Conference Pub Date : 1996-03-29 DOI: 10.1109/SBEC.1996.493289

H. Wendel, W. Heller, H. Hoffmeister

引用次数: 0

A new model for biologic constructs 生物构造的新模型

Proceedings of the 1996 Fifteenth Southern Biomedical Engineering Conference Pub Date : 1996-03-29 DOI: 10.1109/SBEC.1996.493113

S. Levin

引用次数: 0

Determinants of signal to noise ratio in conebeam image reconstruction using the Feldkamp algorithm 利用Feldkamp算法重建锥束图像信噪比的决定因素

Proceedings of the 1996 Fifteenth Southern Biomedical Engineering Conference Pub Date : 1996-03-29 DOI: 10.1109/SBEC.1996.493165

X. Wu, R. Johnson, P. Cho

引用次数: 0

Derivative of Gaussian functions as receptive field models for disparity sensitive neurons of the visual cortex 视差敏感神经元的高斯函数导数接受野模型

Proceedings of the 1996 Fifteenth Southern Biomedical Engineering Conference Pub Date : 1996-03-29 DOI: 10.1109/SBEC.1996.493167

R. E. Frye, Robert, Ledley

{"title":"Derivative of Gaussian functions as receptive field models for disparity sensitive neurons of the visual cortex","authors":"R. E. Frye, Robert, Ledley","doi":"10.1109/SBEC.1996.493167","DOIUrl":"https://doi.org/10.1109/SBEC.1996.493167","url":null,"abstract":"Non-symmetric Gabor functions are particularly useful neurophysiologic models of simple cell receptive fields which respond to disparity characteristics of visual stimuli. The left and right visual channels of these simple cell have receptive field profiles which are phase-shifted alterations of the same one-dimensional Gabor function. These profiles resemble derivative of Gaussian (DOG) functions, although DOG functions have never been evaluated using neurophysiologic data from disparity sensitive neurons. Here the authors demonstrate (a) the space frequency response characteristics of DOG functions as a model of a single receptive field, and (b) the space-frequency response characteristics of the combinations of two same-order DOG functions as a model of a simple cell disparity neuron which combine left and right receptive fields. Combining left and right visual fields in four different ways resulted in two characteristic patterns for both even and odd ordered derivatives. Each pattern appeared to be useful, in a different way, for detecting disparity information. These results suggest that DOG functions can be used to produce a set of equations for detecting disparity information.","PeriodicalId":294120,"journal":{"name":"Proceedings of the 1996 Fifteenth Southern Biomedical Engineering Conference","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116649876","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: 3

Development of an instrumented walker for measurement of unilateral hand loads 一种测量单侧手部负荷的步行器的研制

Proceedings of the 1996 Fifteenth Southern Biomedical Engineering Conference Pub Date : 1996-03-29 DOI: 10.1109/SBEC.1996.493111

R.A. Bachschmidt, G. Harris, G. Simoneau

引用次数: 3

Aortic elastin morphometry by confocal microscopy 用共聚焦显微镜测量主动脉弹性蛋白形态

Proceedings of the 1996 Fifteenth Southern Biomedical Engineering Conference Pub Date : 1996-03-29 DOI: 10.1109/SBEC.1996.493291

R. G. Kratky, M. R. Roach

引用次数: 0

The processing of surgical implants from pure titanium 用纯钛加工外科植入物

Proceedings of the 1996 Fifteenth Southern Biomedical Engineering Conference Pub Date : 1996-03-29 DOI: 10.1109/SBEC.1996.493256

A.P. Arsenjev, P.A. Arsenjev, A. Evdokimov, E.U. Makaricheva, M. J. Sheinin

引用次数: 0

A finite element study of the developing proximal femur 股骨近端发育的有限元研究

Proceedings of the 1996 Fifteenth Southern Biomedical Engineering Conference Pub Date : 1996-03-29 DOI: 10.1109/SBEC.1996.493286

T.G. Ribble, M. Santare, F. Miller

引用次数: 0