Abstract
The main goal of this study is to evaluate how to optimally select the best vibrotactile pattern to be used in a closed loop control of upper limb myoelectric prostheses as a feedback of the exerted force. To that end, we assessed both the selection of actuation patterns and the effects of the selection of frequency and amplitude parameters to discriminate between different feedback levels. A single vibrotactile actuator has been used to deliver the vibrations to subjects participating in the experiments. The results show no difference between pattern shapes in terms of feedback perception. Similarly, changes in amplitude level do not reflect significant improvement compared to changes in frequency. However, decreasing the number of feedback levels increases the accuracy of feedback perception and subject-specific variations are high for particular participants, showing that a fine-tuning of the parameters is necessary in a real-time application to upper limb prosthetics. In future works, the effects of training, location, and number of actuators will be assessed. This optimized selection will be tested in a real-time proportional myocontrol of a prosthetic hand.
Highlights
An amputation is the removal of a limb caused by a trauma, a medical condition, or surgery.Negative impacts to the amputee include the loss of function and sensory perception of the limb as well as changes in their interaction with the environment that may lead to psychological conditions.Limb prosthetics are used to limit the effects of this trauma
One of the primary goals of this study was to select the best vibrotactile pattern to be used as feedback for the force control of an upper limb prostheses
Different pattern shapes were evaluated discriminating feedback levels that corresponded to force levels
Summary
An amputation is the removal of a limb caused by a trauma, a medical condition, or surgery.Negative impacts to the amputee include the loss of function and sensory perception of the limb as well as changes in their interaction with the environment that may lead to psychological conditions.Limb prosthetics are used to limit the effects of this trauma. An amputation is the removal of a limb caused by a trauma, a medical condition, or surgery. Negative impacts to the amputee include the loss of function and sensory perception of the limb as well as changes in their interaction with the environment that may lead to psychological conditions. A prosthesis can be defined as an artificial replacement of the lost limb to regain independence after the amputation. One of the most common control methods is the use of the residual electrical activity of the nerves measured on the stump as an input to the prosthesis. This kind of control is called myoelectric and it naturally replicates how healthy individuals control their limbs [2]
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