Browsing by Author "Bush, Greg"
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Item Open Access Electrochemical Burns: A Risk With Myoelectric Prostheses(1997) Scott, Bob; Caldwell, Bob; Bush, GregThe authors describe their experience myoelectric prostheses, with incidents of minor trauma, to users of which is thought to be associated with electrochemical bums arising from a dc potential existing between electrodes. These incidents have occurred over the period 1968 - 1996, in Winnipeg, Toronto and Fredericton. A possible mechanism is suggested for electrochemical burns where a dc potential of one volt or more exists. Finally, recommendations are made for increased vigilance concerning this possible problem.Item Open Access Recent Advances In The Development Of Partial Hand Prostheses(1997) Biden, Edmund; Bush, Greg; Olive, Murray; Young, WalterRecently, two patients have presented with partial hand amputations in which the digits and distal ends of the metacarpals were missing, but the thumb was intact. One of these was a child with a congenital absence and the other an adult with loss of digits through a farming accident. The child has been fitted with two different systems, the first based on the motor and finger group of an Otto Bock size 5 Electrohand 2000, and the second based on our own, in-house, design. The adult has been fitted with mechanical fingers having multiple locking positions. The prostheses have been used extensively.Item Open Access The Applications Of Alternative Controls For Powered Upper Extremity Prosthetics(1994) Sethna, Fram; Bush, Greg; Heim, Winfried; Wierzba, Sol; Antczak, JerzyCurrently, non-myoelectric controls for electro-mechanical prosthetic components include pull switches, rocker switches, harness pull switches, push-button switches, touch pad actuators (Universal Artificial Limb), touch switches (Steeper), and momentary contact switches. Often these control systems prove to be invaluable Yet, at the same time, their incorporation into a prosthesis often results in a cosmetically unappealing prosthesis. Furthermore, in certain situations the client may be restricted in range of motion due to soft tissue damage, extensive scarring, or other related problems which limit effective performance of conventional controls Recent experience shows that the application of Force Sensing Resistor's (FSRs) and Capacitive Touch Controls (CTCs) in prosthetics presently have specffic use. An increased awareness of possible applications of FSR and CTC technology is anticipated to spark new and innovative applications in the fields of prosthetics and orthotics.Item Open Access Item Open Access Visual Feedback And The Grasping Function Of Prosthetic Hands(1994) Jacques, Gary E.; Naumann, Stephen; Milner, Morris; Cleghorn, William; Bush, Greg; Hubbard, SheilaUpper limb amputees lack the benefit of tactile and proprioceptive feedback while using their pr osthetic hands It has been theorised that they rely almost exclusively upon vision to determine how well objects are grasped, if slippage is occurring, or if the object is being aushed by excessive force. An understanding of how visual feedback affects grasping performance could be an important tool for the prosthesis designer. A method of quantifying visual feedback and its effects on prosthetic grasping function is presented Methods-Time Measurement was used for evaluation, A head mounted camer a was used to record what the user could see while performing a glasping task The data from subjects with natural and prosthetic hands were evaluated and suggest that the technique is suitable to aid in the understanding of the role of visual feedback related to grasping function Results indicate that the shape of objects grasped, as well as visual feedback were important factors in determining the grasping performance. Recommendations are suggested for further research.