IEEE transactions on rehabilitation engineering : a publication of the IEEE Engineering in Medicine and Biology Society最新文献_第7页

A novel speech controller for radio amateurs with a vision impairment. 为视力受损的无线电业余爱好者设计的新型语音控制器。

IEEE transactions on rehabilitation engineering : a publication of the IEEE Engineering in Medicine and Biology Society Pub Date : 2000-03-01 DOI: 10.1109/86.830953

C L Lin, B R Bai, L C Du, C T Hu, S T Young, T S Kuo

引用次数: 0

Muscle recruitment through electrical stimulation of the lumbo-sacral spinal cord. 通过电刺激腰骶脊髓恢复肌肉。

IEEE transactions on rehabilitation engineering : a publication of the IEEE Engineering in Medicine and Biology Society Pub Date : 2000-03-01 DOI: 10.1109/86.830945

V K Mushahwar, K W Horch

{"title":"Muscle recruitment through electrical stimulation of the lumbo-sacral spinal cord.","authors":"V K Mushahwar, K W Horch","doi":"10.1109/86.830945","DOIUrl":"https://doi.org/10.1109/86.830945","url":null,"abstract":"The goal of this study was to determine the feasibility of producing graded muscle contraction in individual muscles or muscle groups by electrically stimulating motor neurons in the lumbo-sacral spinal cord. Recruitment curves were obtained for quadriceps, tibialis anterior and triceps surae/plantaris by stimulating their activation pools in the ventral horn of the feline spinal cord. Mean twitch times-to-peak for quadriceps, tibialis anterior and triceps surae/plantaris were 33.0, 41.0, and 36.0 ms, respectively. Twitch duration as a function of stimulus strength demonstrated a mixed motor unit recruitment order, distinctively different from the inverse recruitment order exhibited by conventional methods of electrical stimulation of peripheral nerve. The recruitment curve slopes (expressed as a percentage of maximum force per nanocurrent of delivered charge) were shallow: 7.9 for quadriceps, 2.6 for tibialis anterior and 8.5 for triceps surae/plantaris. These results show that graded control of force in individual muscles or muscle groups can be obtained through spinal cord stimulation, and suggest that spinal cord stimulation could be used for functional neuromuscular stimulation applications.","PeriodicalId":79442,"journal":{"name":"IEEE transactions on rehabilitation engineering : a publication of the IEEE Engineering in Medicine and Biology Society","volume":"8 1","pages":"22-9"},"PeriodicalIF":0.0,"publicationDate":"2000-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/86.830945","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"21628503","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: 74

Development of a wheelchair occupant injury risk assessment method and its application in the investigation of wheelchair securement point influence on frontal crash safety. 轮椅乘员伤害风险评估方法的建立及其在轮椅固定点对正面碰撞安全影响研究中的应用。

IEEE transactions on rehabilitation engineering : a publication of the IEEE Engineering in Medicine and Biology Society Pub Date : 2000-03-01 DOI: 10.1109/86.830957

G E Bertocci, D A Hobson, K H Digges

{"title":"Development of a wheelchair occupant injury risk assessment method and its application in the investigation of wheelchair securement point influence on frontal crash safety.","authors":"G E Bertocci, D A Hobson, K H Digges","doi":"10.1109/86.830957","DOIUrl":"https://doi.org/10.1109/86.830957","url":null,"abstract":"To promote proper wheelchair securement in transportation, the proposed ANSI/RESNA Standard on Wheelchairs Used as Seats in Motor Vehicles will require that all transit wheelchairs be equipped with four securement points compatible with strap-type tiedowns. Through computer simulations, the location of these securement points has been found to influence wheelchair user response to a frontal crash. This study develops and employs an injury risk assessment method to compare the crashworthiness of various securement point configurations. The comparative injury risk assessment method is designed to predict the risk associated with internalized crash forces, as well as risk associated with secondary occupant impact with the vehicle interior. Injury criteria established by Federal Motor Vehicle Safety Standards and General Motors, along with excursion limitations set by the Society of Automotive Engineers (SAE) J2249 Wheelchair Tiedowns and Occupant Restraint Systems (WTORS) Standard were used as benchmarks for the risk assessment method. The simulation model subjected a secured commercial powerbase wheelchair with a seated 50th percentile male Hybrid III test dummy to a 20 g/30 mph crash. The occupant was restrained using pelvic and shoulder belts, and the wheelchair was secured with four strap-type tiedowns. Results indicated that securement points located 1.5 in to 2.5 in above the evaluated wheelchair's center of gravity provide the most effective occupant protection.","PeriodicalId":79442,"journal":{"name":"IEEE transactions on rehabilitation engineering : a publication of the IEEE Engineering in Medicine and Biology Society","volume":"8 1","pages":"126-39"},"PeriodicalIF":0.0,"publicationDate":"2000-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/86.830957","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"21627691","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: 21

Multimicroelectrode stimulation within the cat L6 spinal cord: influences of electrode combinations and stimulus interleave time on knee joint extension torque. cat L6脊髓内多微电极刺激:电极组合和刺激间隔时间对膝关节伸展扭矩的影响

IEEE transactions on rehabilitation engineering : a publication of the IEEE Engineering in Medicine and Biology Society Pub Date : 2000-03-01 DOI: 10.1109/86.830943

C Tai, A M Booth, C J Robinson, W C de Groat, J R Roppolo

{"title":"Multimicroelectrode stimulation within the cat L6 spinal cord: influences of electrode combinations and stimulus interleave time on knee joint extension torque.","authors":"C Tai, A M Booth, C J Robinson, W C de Groat, J R Roppolo","doi":"10.1109/86.830943","DOIUrl":"https://doi.org/10.1109/86.830943","url":null,"abstract":"During multimicroelectrode stimulation within the cat L6 spinal cord, the number of electrodes activated, their separation distance, and the stimulus interleave time all influenced isometric knee joint extension torque. The torque evoked by stimulation with a three electrode combination could be enhanced or suppressed when compared with that evoked by single or paired electrode stimulation. A similar difference was noted when comparing two electrode combination versus single electrode stimulation. Relative fatigue was not improved significantly by interleaving the stimuli from two or three microelectrodes. Compared with the extension torque response evoked by noninterleaved stimulation, torque evoked by interleaved stimulation with the two microelectrode combination was decreased when the electrode distance was 2.0 mm or less and increased when the electrode distance was 3.0 mm. Designing an optimal stimulation strategy for multimicroelectrode spinal cord stimulation will be challenging and complex if a suppression effect among these electrodes is to be avoided. To reduce muscle fatigue, an asynchronous, interleaved strategy of stimulation may be required.","PeriodicalId":79442,"journal":{"name":"IEEE transactions on rehabilitation engineering : a publication of the IEEE Engineering in Medicine and Biology Society","volume":"8 1","pages":"1-10"},"PeriodicalIF":0.0,"publicationDate":"2000-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/86.830943","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"21628501","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: 25

Biomechanical evaluation of a prototype foot/ankle prosthesis. 脚/踝关节假体原型的生物力学评价。

IEEE transactions on rehabilitation engineering : a publication of the IEEE Engineering in Medicine and Biology Society Pub Date : 2000-03-01 DOI: 10.1109/86.830960

P M Quesada, M Pitkin, J Colvin

引用次数: 0

Measurement of external pressures generated by nerve cuff electrodes. 测量由神经套电极产生的外部压力。

IEEE transactions on rehabilitation engineering : a publication of the IEEE Engineering in Medicine and Biology Society Pub Date : 2000-03-01 DOI: 10.1109/86.830947

F A Cuoco, D M Durand

{"title":"Measurement of external pressures generated by nerve cuff electrodes.","authors":"F A Cuoco, D M Durand","doi":"10.1109/86.830947","DOIUrl":"https://doi.org/10.1109/86.830947","url":null,"abstract":"When external pressures are applied to a peripheral nerve, tissue damage can occur via compression and blood flow occlusion, resulting in degeneration and demyelination of axons. Although many types of nerve electrodes have been designed to avoid or minimize this pressure during stimulation of the nerve or recording of its activity, the measurement of the pressure exerted by these cuffs has not been reported. Currently, only theoretical models are used to predict nerve cuff electrode pressures. We have developed a nerve cuff electrode pressure sensor to measure external pressures exerted by peripheral nerve cuff electrodes. The sensor has a high sensitivity, linear response with little hysteresis and reproducible output. Pressure measurements have been obtained for split-ring and spiral cuff electrodes. The measurements obtained are in agreement with theoretical predictions. Moreover, they indicate that the pressures exerted by cuffs currently used for stimulation generate only a small amount of pressure, which is below the pressure required to occlude blood flow in nerves. The results also suggest that this new sensor can provide reliable measurement of external pressures exerted by nerve electrodes and would be an important tool for comparing various nerve cuff electrode designs.","PeriodicalId":79442,"journal":{"name":"IEEE transactions on rehabilitation engineering : a publication of the IEEE Engineering in Medicine and Biology Society","volume":"8 1","pages":"35-41"},"PeriodicalIF":0.0,"publicationDate":"2000-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/86.830947","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"21627770","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: 27

Feedback error learning neural network for trans-femoral prosthesis. 经股假体的反馈误差学习神经网络。

IEEE transactions on rehabilitation engineering : a publication of the IEEE Engineering in Medicine and Biology Society Pub Date : 2000-03-01 DOI: 10.1109/86.830951

V D Kalanovic, D Popovic, N T Skaug

{"title":"Feedback error learning neural network for trans-femoral prosthesis.","authors":"V D Kalanovic, D Popovic, N T Skaug","doi":"10.1109/86.830951","DOIUrl":"https://doi.org/10.1109/86.830951","url":null,"abstract":"Feedback-error learning (FEL) neural network was developed for control of a powered trans-femoral prosthesis. Nonlinearities and time-variations of the dynamics of the plant, in addition to redundancy and dynamic uncertainty during the double support phase of walking, makes conventional control methods very difficult to use. Rule-based control, which uses a knowledge base determined by machine learning and finite automata method is limited since it does not respond well to perturbations and environmental changes. FEL can be regarded as a hybrid control, because it combines nonparametric identification with parametric modeling and control. This paper presents simulation of a powered trans-femoral prosthesis controlled by a FEL neural network. Results suggest that FEL can be used to identify inverse dynamics of an arbitrary trans-femoral prosthesis during simple single joint movements (e.g., sinusoidal oscillations). The identified inverse dynamics then allows the tracking of an arbitrary trajectory such as a desired walking pattern within a multijoint structure. Simulation shows that the identified controller responds correctly when the leg motion is exposed to a perturbation such as a frequent change of the ground reaction force or the hip joint torque generated by the user. FEL eliminates the need for precise, tedious, and complex identification of model parameters.","PeriodicalId":79442,"journal":{"name":"IEEE transactions on rehabilitation engineering : a publication of the IEEE Engineering in Medicine and Biology Society","volume":"8 1","pages":"71-80"},"PeriodicalIF":0.0,"publicationDate":"2000-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/86.830951","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"21627774","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: 53

Practical low-cost visual communication using binary images for deaf sign language. 使用二值图像进行聋人手语的低成本视觉交流。

IEEE transactions on rehabilitation engineering : a publication of the IEEE Engineering in Medicine and Biology Society Pub Date : 2000-03-01 DOI: 10.1109/86.830952

M D Manoranjan, J A Robinson

{"title":"Practical low-cost visual communication using binary images for deaf sign language.","authors":"M D Manoranjan, J A Robinson","doi":"10.1109/86.830952","DOIUrl":"https://doi.org/10.1109/86.830952","url":null,"abstract":"Deaf sign language transmitted by video requires a temporal resolution of 8 to 10 frames/s for effective communication. Conventional videoconferencing applications, when operated over low bandwidth telephone lines, provide very low temporal resolution of pictures, of the order of less than a frame per second, resulting in jerky movement of objects. This paper presents a practical solution for sign language communication, offering adequate temporal resolution of images using moving binary sketches or cartoons, implemented on standard personal computer hardware with low-cost cameras and communicating over telephone lines. To extract cartoon points an efficient feature extraction algorithm adaptive to the global statistics of the image is proposed. To improve the subjective quality of the binary images, irreversible preprocessing techniques, such as isolated point removal and predictive filtering, are used. A simple, efficient and fast recursive temporal prefiltering scheme, using histograms of successive frames, reduces the additive and multiplicative noise from low-cost cameras. An efficient three-dimensional (3-D) compression scheme codes the binary sketches. Subjective tests performed on the system confirm that it can be used for sign language communication over telephone lines.","PeriodicalId":79442,"journal":{"name":"IEEE transactions on rehabilitation engineering : a publication of the IEEE Engineering in Medicine and Biology Society","volume":"8 1","pages":"81-8"},"PeriodicalIF":0.0,"publicationDate":"2000-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/86.830952","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"21627775","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: 23

Functional electrical stimulation of abdominal muscles to augment tidal volume in spinal cord injury. 功能性电刺激腹部肌肉以增加脊髓损伤的潮气量。

IEEE transactions on rehabilitation engineering : a publication of the IEEE Engineering in Medicine and Biology Society Pub Date : 2000-03-01 DOI: 10.1109/86.830946

U Stanic, F Kandare, R Jaeger, J Sorli

{"title":"Functional electrical stimulation of abdominal muscles to augment tidal volume in spinal cord injury.","authors":"U Stanic, F Kandare, R Jaeger, J Sorli","doi":"10.1109/86.830946","DOIUrl":"https://doi.org/10.1109/86.830946","url":null,"abstract":"Functional electrical stimulation (FES) of abdominal muscles as a method of enhancing ventilation was explored in six neurologically intact subjects and five subjects with spinal cord injury (SCI) who had levels of injury between C4 and C7. Pulmonary ventilation was augmented in both groups predominantly due to an increase in tidal volume. The average increase in tidal volume during FES for the neurologically intact group was 350 ml, while in the SCI group it was 220 ml. The FES caused active volume decreases in both the lower thorax and upper abdomen, which together appear to be the mechanism behind the increases seen in tidal volume. Therefore, the proposed method might be useful in future clinical practice. The results indicate that FES of abdominal muscles should be more thoroughly explored as a potential technique of ventilatory support in SCI. The results also point to the necessity for further studies of maintaining the condition of the chest wall in the pulmonary rehabilitation of individuals with tetraplegia.","PeriodicalId":79442,"journal":{"name":"IEEE transactions on rehabilitation engineering : a publication of the IEEE Engineering in Medicine and Biology Society","volume":"8 1","pages":"30-4"},"PeriodicalIF":0.0,"publicationDate":"2000-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/86.830946","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"21627769","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: 44

Adaptive neural network control of cyclic movements using functional neuromuscular stimulation. 应用功能性神经肌肉刺激的自适应神经网络控制循环运动。

IEEE transactions on rehabilitation engineering : a publication of the IEEE Engineering in Medicine and Biology Society Pub Date : 2000-03-01 DOI: 10.1109/86.830948

J Riess, J J Abbas

{"title":"Adaptive neural network control of cyclic movements using functional neuromuscular stimulation.","authors":"J Riess, J J Abbas","doi":"10.1109/86.830948","DOIUrl":"https://doi.org/10.1109/86.830948","url":null,"abstract":"In this study, we evaluated the performance of an adaptive feedforward controller and its ability to automatically develop and customize stimulation patterns for use in functional neuromuscular stimulation (FNS) systems. Results from previous experiments using the pattern generator/pattern shaper (PG/PS) controller to generate isometric contractions demonstrated its ability to adjust stimulation patterns to account for recruitment nonlinearities and muscle dynamics. In this study, the PG/PS controller was tested under isotonic conditions. This evaluation required the PG/PS controller to account for muscle length-tension and force-velocity properties as well as limb dynamics. The performance of the adaptive controller was also compared with that of a proportional-derivative (PD) feedback controller. The PG/PS controller is composed of a neural network system that adaptively filters a periodic signal to produce a muscle stimulation pattern for generating cyclic movements. We used computer-simulated models to determine controller parameters for the PG/PS and PD controller that perform well across a variety of musculoskeletal systems. The controllers were then experimentally evaluated on both legs of two subjects with spinal cord injury. Results indicated that the PG/PS controller was able to achieve and maintain better tracking performance than the PD controller. This study indicates that the PG/PS control system may provide an effective mechanism for automatically customizing stimulation patterns for individuals using FNS systems.","PeriodicalId":79442,"journal":{"name":"IEEE transactions on rehabilitation engineering : a publication of the IEEE Engineering in Medicine and Biology Society","volume":"8 1","pages":"42-52"},"PeriodicalIF":0.0,"publicationDate":"2000-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/86.830948","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"21627771","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: 97