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Rehabilitation Engineering, IEEE Transactions on

Issue 2 • Date Jun 1993

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Displaying Results 1 - 7 of 7
  • Improving the efficacy of electrical stimulation-induced leg cycle ergometry: an analysis based on a dynamic musculoskeletal model

    Publication Year: 1993 , Page(s): 109 - 125
    Cited by:  Papers (31)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1624 KB)  

    To improve the design and increase the effectiveness of electrical stimulation-induced leg cycle ergometry, it is necessary to have a better understanding of the factors that influence the force production capabilities of the stimulated muscles, the ability of the muscles to produce the desired movement, and the metabolic demands of the contractions. A dynamic musculoskeletal model capable of simulating a spinal cord injured (SCI) person exercising on a stimulation-powered leg cycle ergometer was developed to explore these issues. This model was used to address the concern whether performance can be improved by changing seat configuration, the loading, or the intermuscle stimulation pattern. Performance was assessed in terms of the probability that a given SCI subject would be able to maintain a steady cadence, the relative strength required by each muscle group to pedal alone, and the estimated rate of metabolic energy utilization associated with steady-state pedaling. The authors considered the sensitivity of the model predictions to intersubject variability. Several strategies are suggested for either minimizing the strength needed to pedal, or maximizing the cardiovascular aerobic exercise View full abstract»

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  • An analysis of the reliability of percutaneous intramuscular electrodes in upper extremity FNS applications

    Publication Year: 1993 , Page(s): 126 - 132
    Cited by:  Papers (11)  |  Patents (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (924 KB)  

    Electrical stimulation through chronically indwelling percutaneous intramuscular electrodes has been utilized to restore functional grasp in paralyzed individuals. A retrospective analysis of the reliability of the electrode has demonstrated the utility of these electrodes for chronic use in functional neuromuscular stimulation of the upper extremity. The study involved 710 electrodes implanted in 38 patients in Cleveland over a 13.5 year period. Complications were infrequent and minor. The probability of an electrode surviving for six months was 88%, allowing outpatient use of an upper extremity neuroprosthetic system View full abstract»

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  • Mechanical compensation for weak triceps in C5/C6 tetraplegia

    Publication Year: 1993 , Page(s): 72 - 78
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (592 KB)  

    Persons with spinal cord injury at the C5/C6 cervical level typically have relatively well preserved biceps function, but minimal or no voluntary control of triceps. The authors' previous work demonstrated that this results in deficiencies in speed and accuracy of elbow movements. The authors' goal is to design a simple mechanical orthosis, worn at the elbow, to correct these deficiencies and also to improve reaching capacity. In this study, the authors have specified the mechanical components necessary for this orthosis by performing computer simulations of movements at the elbow joint and experiments with C5/C6 tetraplegic subjects in which their triceps function was assisted with electronically emulated mechanical springs and damping elements. Results indicate that provision of an elbow orthosis consisting of a constant torque spring and a viscous damping element should obtain the best improvement in arm function of tetraplegic subjects with weak triceps View full abstract»

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  • Measurement of stresses in three orthogonal directions at the residual limb-prosthetic socket interface

    Publication Year: 1993 , Page(s): 79 - 85
    Cited by:  Papers (5)  |  Patents (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (748 KB)  

    Transducers were developed to measure stresses in three orthogonal directions applied on a below-knee amputee residual limb within a prosthetic socket during walking. Strain-gage measurement techniques were used for all three orthogonal directions. Instrumentation error for four transducers averaged less than 4.2% full-scale output (FSO) for the normal direction and less than 0.9% FSO for shear directions. Measurements from amputee subjects collected during walking trials are presented View full abstract»

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  • A portable programmable digital sound processor for cochlear implant research

    Publication Year: 1993 , Page(s): 94 - 100
    Cited by:  Papers (12)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (828 KB)  

    A programmable sound processor which utilizes digital signal processing has been developed for hearing prosthesis research. It incorporates a Motorola DSP56001 integrated circuit, 32 K words of memory, a 12 b analog-to-digital converter, and a data formatter and transmitter which conveys control codes to the receiver-stimulator of a cochlear implant. The processor is pocket-sized and battery powered. It has been programmed to emulate the Spectral Maxima Sound Processor for the University of Melbourne/Nucleus 22 electrode implant, and is currently being used by several implantees. In continuing research, speech processing programs are being improved, and other applications, including signal processing for binaural implants and advanced hearing aids, are being developed View full abstract»

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  • Evaluation of rehabilitation of patients with total hip replacement

    Publication Year: 1993 , Page(s): 86 - 93
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (764 KB)  

    A qualitative-quantitative evaluation approach was applied to 56 patients with total hip replacement (THR). This consisted of passive range of movement, clinical gait observation and measurement of 3-D electrogoniometric system. A ground reaction force shoe system and instant velocity system were applied and tested. The data before and one year after operation were compared. This approach offers a complete and detailed picture of the beneficial effects of THR. Patients were divided into four groups based on cemented and noncemented type of the implants, and standard rehabilitation and rehabilitation which included functional electrical simulation. Analysis of variance showed that there was no difference in the change observed in the analyzed gait parameters between these groups of patients. All groups improved, but not one group improved more than another. A simple gait evaluation method suitable for routine clinical use consisting of a two-page FORM and gait velocity measurement by stop watch is proposed View full abstract»

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  • Paresthesia thresholds in spinal cord stimulation: a comparison of theoretical results with clinical data

    Publication Year: 1993 , Page(s): 101 - 108
    Cited by:  Papers (6)  |  Patents (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (856 KB)  

    The potential distributions produced in the spinal cord and surrounding tissues by dorsal epidural stimulation at the midcervical, midthoracic, and low thoracic levels were calculated with the use of a volume conductor model. Stimulus thresholds of myelinated dorsal column fibers and dorsal root fibers were calculated at each level in models in which the thickness of the dorsal cerebrospinal fluid (CSF) layer was varied. Calculated stimulus thresholds were compared with paresthesia thresholds obtained from measurements at the corresponding spinal levels in patients. The influences of the CSF layer thickness, the contact separation in bipolar stimulation and the laterality of the electrodes on the calculated thresholds were in general agreement with the clinical data View full abstract»

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Aims & Scope

This Transaction ceased publication in 2000. The current retitled publication is IEEE Transactions on Neural Systems and Rehabiliation Engineering.

Full Aims & Scope