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The appearance of non-resolving non-path-related symptomatology following some low voltage (120/240 volt) electrical contacts has proven to be a scientific puzzlement. The problem is that the best of our diagnostic technology is not yet technologically advanced enough to image the mechanism of injury. Still, in the context of this wealth of data, by inference, it is more likely than not that the underlying...
When considering the issue of electrical safety in product and system design, it is critical to use a well defined design process that complies with the legal standards. Engineers need not be lawyers but they do need to understand how the law views the process of engineering design. For any product or system that brings electrical energy into close proximity with human users, the risk of electrical...
The reasonable person is one who acts with prudence. To avoid liability, product design must assure that the reasonable person will not be injured. The question addressed herein is how much of the reasonable person is reasonably the result of the design and programming of the human machine itself? Is reasonableness nature or nurture? Avoiding injury is often all about seeing, understanding, and avoiding...
Using geometric primitives, a three dimensional finite element model has been developed to assess the pathway followed by electric current during an electrical accident assuming the entry point for the current was on one hand. Results indicate that the area where the risk of soft tissue injury is greatest is in the wrist region. Current entry on the palm or finger fronts was found to be more likely...
Diffuse electrical injury (DEI) is a rarely occurring class of electrical injury that can arise even after a low voltage contact. It is characterized by broad symptomatology which is often disproportionate to the magnitude of the contact. The occurrence rate of 65 symptoms, categorized by gender, was studied. Data was derived from a Web-based interactive survey of individuals who suffered low voltage...
A protocol has been defined for use in a dedicated system for gathering biosignals from multiple surface electrode sights over a local area network (LAN). This protocol will be used to support multiple simultaneously functioning channels connected serially along a single wire. The device is designed to transmit data using a highly efficient data conversion and collection technique that eliminates...
A dedicated system has been designed for multichannel electromyography and other biosignal acquisition applications using the miniaturization capability of hybrid microelectronics technology. In this system, each electrode set site is provided with a hardware module consisting of a high-common mode rejection ratio differential amplifier, low-pass filter, a 12-bit analog-to-digital converter, a parallel-to-serial...
In two separate studies, a correlation has been observed between the myoelectric signals (MESs) present in neck muscles during speech and the acoustic waveform. In the first study, five experiments were conducted using a 17-word vocabulary. The application of maximum likelihood pattern recognition to the averaged myoelectric signal produced recognition accuracies as high as 98% for a two-word set...
A stimulator has been designed for application in both clinical and laboratory environments. It is the purpose of this device to function as a rehabilitative assist device for individuals with spinal injuries. The stimulator uses a multiple parallel processor (master-slave) configuration to support a multiple-channel coordinated approach to functional neural stimulation (FNS). Each channel functions...
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