Fig 1 - uploaded by Muhammad Sohaib Faiz
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(Color online) Rehabilitation device has four DOF. Brown part is assigned wood, red parts are declared motors, white part represent PVC and gray parts represent Aluminum.
Source publication
With the aim of recovery and training of the patients suffering from osteoarthritis, muscular dystrophy and stroke, we present a design and validation model of a mechanical rehabilitation device for the hand. The objective is to bring together the advances in mechanism effectiveness, reduced size, simpler assembly, and lower manufacturing costs. As...
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... device is portable as well as light weighted due to the materials adopted to make this. Materials like wood, acrylic and aluminum alloys are selected for different parts (see Fig. 1). Mechanical design of the device, its kinematic simulation and stress analysis are discussed in this paper. This rehab device is intended to assist in flexion/ extension of hand and arm, closing and opening of fingers and supination/pronation simultaneously. Four different motors are provided to execute these functions (Fig. 1). Wrist ...
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... parts (see Fig. 1). Mechanical design of the device, its kinematic simulation and stress analysis are discussed in this paper. This rehab device is intended to assist in flexion/ extension of hand and arm, closing and opening of fingers and supination/pronation simultaneously. Four different motors are provided to execute these functions (Fig. 1). Wrist flexion combined with closing of hand assist to increase grasping force of the hand commonly known as power grip. While motor function of the primary cortex and corticospinal tract are activated due to wrist extension as it is cortically based motor ...
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... is designed to achieve 60 (clockwise) to 70 (anti-clockwise) for flexion and extension of the hand, accordingly having its neutral axis at 0 . Figure 9 represents the trajectory of the motion for flexion and extension of the hand. According to the motion curve obtained (Fig. 10), this device is set to achieve a rotation of 90 (anti-clockwise) to 30 (clockwise) having 0 at neutral axis of the arm. This complete motion takes about 12 s. Meanwhile, post kinematic analysis of the model describes angle, position, angular velocity of PIP joint and acceleration as well. The device parts move smoothly without any ...
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... portion under high stress levels with higher chances of failure. Results show that the maximum displacement was 1.37e À04 mm, shown in red patterns. It shows maximum deformation will occur at the initial portion of the first slider that is connected with the actuator as well as the last portion of the finger that is attached to the tip of finger (Fig. 11). Maximum von-Mises stress value obtained is 3.14e þ2 kPa and maximum principal stress value is 41.27 kPa. A similar analysis was performed on the rest of the device to find stresses and deformation. Results below show the values of vonMises stresses as max 21.94 MPa while max deformation is 0.0379 mm. Maximum value of principal stress ...
