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Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference最新文献

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A comparison of 2D and 3D techniques for the determination of normal pediatric running kinematics 确定正常儿童跑步运动学的2D和3D技术的比较
Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference Pub Date : 1991-04-04 DOI: 10.1109/NEBC.1991.154685
R.B. Davis, S. Õunpuu
{"title":"A comparison of 2D and 3D techniques for the determination of normal pediatric running kinematics","authors":"R.B. Davis, S. Õunpuu","doi":"10.1109/NEBC.1991.154685","DOIUrl":"https://doi.org/10.1109/NEBC.1991.154685","url":null,"abstract":"Two methods used for the computation of joint rotation angles associated with running are compared. The first is a full 3-D technique which allows for the determination of up to three axial rotations at each lower limb segment joint. This method is used as the basis for comparison with a relatively straightforward 2-D computational alternative. In this way, the validity of the 2-D approaches typically employed in the examination of limb rotation patterns associated with running is examined. With respect to pediatric running, this preliminary investigation indicates that 2-D kinematic approaches may adequately represent the sagittal plane motion of the hip and knee, but be insufficient for describing ankle plantar/dorsiflexion.<<ETX>>","PeriodicalId":434209,"journal":{"name":"Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference","volume":"156 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115744641","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: 5
The development and initial testing of a new sensor to simultaneously measure strain and pressure in tendons and ligaments 一种新型传感器的开发和初步测试，可以同时测量肌腱和韧带的应变和压力
Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference Pub Date : 1991-04-04 DOI: 10.1109/NEBC.1991.154660
C. Stankewich, B. Beynnon, B. Fleming, M. Pope, R.J. Johnson, P. Renstrom, C. Nichols
{"title":"The development and initial testing of a new sensor to simultaneously measure strain and pressure in tendons and ligaments","authors":"C. Stankewich, B. Beynnon, B. Fleming, M. Pope, R.J. Johnson, P. Renstrom, C. Nichols","doi":"10.1109/NEBC.1991.154660","DOIUrl":"https://doi.org/10.1109/NEBC.1991.154660","url":null,"abstract":"A miniature sensor was constructed to simultaneously measure both local strain and pressure in soft tissues. An attempt was made to determine if the data output from the sensor can be used to determine the absolute zero strain reference or the Hall effect strain transducer (HEST) length at which the tendon just begins to be loaded. With this reference, an attempt was also made to determine whether the pressure measurement from the sensor can be used to predict the stress applied to the tendon. Six fresh bovine tendon specimens were tested. The authors demonstrated the ability to accurately and reproducibly determine an absolute reference which permits definition of zero strain. The prediction of tendon stress also seems possible.<<ETX>>","PeriodicalId":434209,"journal":{"name":"Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114867049","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: 5
Two methods of approximating nonlinear V-I arc characteristics in electrosurgery 电外科非线性V-I电弧特性的两种近似方法
Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference Pub Date : 1991-04-04 DOI: 10.1109/NEBC.1991.154669
A. Rothwell, J. Lacourse, S. Selikowitz
{"title":"Two methods of approximating nonlinear V-I arc characteristics in electrosurgery","authors":"A. Rothwell, J. Lacourse, S. Selikowitz","doi":"10.1109/NEBC.1991.154669","DOIUrl":"https://doi.org/10.1109/NEBC.1991.154669","url":null,"abstract":"By examining the characteristics of the output voltage (V) versus the output current (I) of the electrical arc during simulated surgery for several input (sinusoidal) voltages, a relationship of these two parameters may possibly be determined. Initially, the relationship is examined by separating each curve into a discharge and a nondischarge region. A linear function is fitted using least squares for each region. By taking the inverse of the slope of each equation estimated, the impedance is studied for increasing input voltage. In addition, by treating each curve as a complete relationship, a nonlinear least squares approximation is executed which estimates the relationship as a third order polynomial. By obtaining a relationship in this manner, one can begin to determine a range of parameters which may be both safe and effective.<<ETX>>","PeriodicalId":434209,"journal":{"name":"Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114954934","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: 4
Performance optimization of the pulsatile synchronous LVAD based on myocardial energetics and cardiac output using a computer simulation 基于心肌能量学和心输出量的脉动式同步LVAD性能优化
Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference Pub Date : 1991-04-04 DOI: 10.1109/NEBC.1991.154637
K. Platt, T. Moore, S. Dubin, D. Jaron
{"title":"Performance optimization of the pulsatile synchronous LVAD based on myocardial energetics and cardiac output using a computer simulation","authors":"K. Platt, T. Moore, S. Dubin, D. Jaron","doi":"10.1109/NEBC.1991.154637","DOIUrl":"https://doi.org/10.1109/NEBC.1991.154637","url":null,"abstract":"When myocardial infarction compromises cardiac output, treatment sometimes involves the application of a pulsatile synchronous left ventricular assist device (LVAD). The authors use a computer simulation to explore the possibility of optimal phasing of pump cycle with respect to events in the cardiac cycle from the standpoint of improved myocardial energetics and system flow. Central to the simulation is a time-varying elastance model of the left ventricle. It is coupled to a closed-loop circulatory model that consists of a nonlinear multielement aorta model, the main aortic branches including the coronaries, a lumped venous system model, a time-varying elastance model of the right ventricle, and lumped models of the pulmonary arteries, and veins. Oxygen availability per beat is calculated from the arteriovenous oxygen difference and the total coronary flow and oxygen consumption per beat is computed.<<ETX>>","PeriodicalId":434209,"journal":{"name":"Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129833024","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
A solid, locked intramedullary nail, for humeral fracture fixation: a biomechanical analysis 实心锁定髓内钉用于肱骨骨折固定:生物力学分析
Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference Pub Date : 1991-04-04 DOI: 10.1109/NEBC.1991.154564
A. Waite, M. Zimmerman, J. Tovey, W. Oppenheim, J. Parsons
{"title":"A solid, locked intramedullary nail, for humeral fracture fixation: a biomechanical analysis","authors":"A. Waite, M. Zimmerman, J. Tovey, W. Oppenheim, J. Parsons","doi":"10.1109/NEBC.1991.154564","DOIUrl":"https://doi.org/10.1109/NEBC.1991.154564","url":null,"abstract":"Orthofix, a new solid interlocking intramedullary fracture fixation system, was biomechanically tested in human cadaveric humeri. The interlocking solid nail provides rigid fixation, while the targeting device lessens the need for dynamic intraoperative X-rays. Cadaveric humeri with midshaft, transverse fractures were fixed with either the Orthofix device or Broad dynamic compression plates (DCPs), and were subsequently tested nondestructively in four-point bending and destructively in torsion. The results show that the humerus/Orthofix nail construct has lower bending properties than the humerus/Broad DCP plate construct, but possesses higher torsional properties. Ease of insertion, minimal surgical exposure, superior tortional stability, and the potential for reducing X-ray exposure make the Orthofix device an attractive alternative to Broad DCP plates.<<ETX>>","PeriodicalId":434209,"journal":{"name":"Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference","volume":"197 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128462878","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
Interaction of magnetic field with blood flow 磁场与血流的相互作用
Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference Pub Date : 1991-04-04 DOI: 10.1109/NEBC.1991.154589
S. Lee, G. Dulikravich, B. Kosović
{"title":"Interaction of magnetic field with blood flow","authors":"S. Lee, G. Dulikravich, B. Kosović","doi":"10.1109/NEBC.1991.154589","DOIUrl":"https://doi.org/10.1109/NEBC.1991.154589","url":null,"abstract":"A mathematical model governing steady laminar flow of an incompressible fluid subjected to a steady magnetic field including internal heating due to Joule effect, heat transfer due to conduction and convection, and thermally induced buoyancy forces has been developed. The thermal buoyancy was accounted for via Boussinesq approximation. To demonstrate effects of the Lorentz and Joule heating on the blood flow, two configurations have been chosen. The first configuration consists of a closed rectangular container (two-dimensional), and the second is a three-dimensional pipe with rectangular cross section. Results of test cases with and without applied magnetic field demonstrate influence of the magnitude of the magnetic field on the recirculating blood flow instability.<<ETX>>","PeriodicalId":434209,"journal":{"name":"Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130923275","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
Effects of chronic stress on startle response: a three dimensional analysis 慢性应激对惊吓反应的影响:一个三维分析
Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference Pub Date : 1991-04-04 DOI: 10.1109/NEBC.1991.154617
N.J. McCaffrey, S. Reisman, W. Tapp
{"title":"Effects of chronic stress on startle response: a three dimensional analysis","authors":"N.J. McCaffrey, S. Reisman, W. Tapp","doi":"10.1109/NEBC.1991.154617","DOIUrl":"https://doi.org/10.1109/NEBC.1991.154617","url":null,"abstract":"A startle measuring system was designed to isolate forces exerted by a rodent into three rectangular coordinates, digitize and store the resulting signals, and process the signals to perform correlation and spectral analysis on them. This effect is studied to find characteristic differences in behavior between normal and chronically stressed animals. This system is claimed to be an improvement on existing systems as it can segregate each component in quadrature and the mean vertical components can be removed from the readings as the weight of the animal to normalize the signals for comparisons across groups and time.<<ETX>>","PeriodicalId":434209,"journal":{"name":"Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129722362","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
Inverse power-law distributions and 1/F power spectra in fetal breathing dynamics 胎儿呼吸动力学的逆幂律分布和1/F功率谱
Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference Pub Date : 1991-04-04 DOI: 10.1109/NEBC.1991.154571
H. Szeto, G. Dwyer, P. Cheng
{"title":"Inverse power-law distributions and 1/F power spectra in fetal breathing dynamics","authors":"H. Szeto, G. Dwyer, P. Cheng","doi":"10.1109/NEBC.1991.154571","DOIUrl":"https://doi.org/10.1109/NEBC.1991.154571","url":null,"abstract":"It is shown that fetal breathing dynamics demonstrate an inverse power-law relationship in the distributions of the inter-burst intervals and in the power spectrum. Furthermore, it is shown how these fractal characteristics change as a function of gestational age of the fetus. The observation of the inverse power-law relationship in the fetal breathing dynamics supports the proposal that fractal mechanisms may be involved in the regulation of breathing rate variability, giving rise to self-similar fluctuations over multiple time scales.<<ETX>>","PeriodicalId":434209,"journal":{"name":"Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123358481","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
A single artery model with stenosis in the time domain 时域狭窄的单动脉模型
Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference Pub Date : 1991-04-04 DOI: 10.1109/NEBC.1991.154592
D. Lizotte, J. LaCourse
{"title":"A single artery model with stenosis in the time domain","authors":"D. Lizotte, J. LaCourse","doi":"10.1109/NEBC.1991.154592","DOIUrl":"https://doi.org/10.1109/NEBC.1991.154592","url":null,"abstract":"A time domain model of pressure pulse propagation in a single artery with stenosis is presented. The aortic pressure pulse is used as input with a single axisymmetric stenosis of varying parameters simulated at 15 cm from the heart in the 30-cm segment of aorta modeled. Results are presented for stenosis length and percent constriction variation for two stenosis shapes (cylindrical and triangular). It is shown that peak reflected pressure is more sensitive than peak transmitted pressure in general. The effects of forward propagation through a junction are also discussed.<<ETX>>","PeriodicalId":434209,"journal":{"name":"Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference","volume":"154 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122995111","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
Electrically evoked emissions and acoustic trauma 电诱发辐射和声损伤
Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference Pub Date : 1991-04-04 DOI: 10.1109/NEBC.1991.154650
H. Nakajima, E. Olson, D. Mountain, A. Hubbard
{"title":"Electrically evoked emissions and acoustic trauma","authors":"H. Nakajima, E. Olson, D. Mountain, A. Hubbard","doi":"10.1109/NEBC.1991.154650","DOIUrl":"https://doi.org/10.1109/NEBC.1991.154650","url":null,"abstract":"By studying the nature of the cochlea's ability to produce an acoustic response to electrical current stimuli the authors analyze the mechanism of the active process present in mammalian hearing. A microelectrode is inserted into scala media and sinusoidal electrical current is passed through the organ of Corti. This produces an acoustic emission at the frequency of electrical stimulation. The authors investigated the effect of acoustic trauma on the magnitude and phase of the electrically evoked emissions. Gerbils were exposed to traumatizing tones of 110 dB SPL for 7 min at 4500, 1800, and 800 Hz. The experimental results show that for low electrical frequency, below the characteristic frequency of the electrode location, emissions increase in magnitude. For high electrical frequency, near the characteristic frequency of the electrode, emissions decrease in magnitude due to acoustic trauma. The effects are more pronounced when the locations including the electrode place are traumatized.<<ETX>>","PeriodicalId":434209,"journal":{"name":"Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116885102","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: 6
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