Right hand adjustable terminal device, ICRC compatible

Last crawled date: 1 year, 10 months ago

The proposed hand prosthetic has three fingers. The pointing finger and the middle finger are in a fix position on a palm like shape, while the opposable finger can be placed in different positions on a circular path. The opposable finger can be also rotated so that to finely tune the distances between fingers and thus to adapt it to different objects. Some objects can be hold using all three fingers, while others can be hold using only two fingers (one of them mandatory being the opposable finger).
The proposed device is a passive one, but it can be adjusted for accommodating objects with different shapes and dimensions. The objects can be placed and fixed in the space between fingers using the left hand. At the beginning of hand prosthetic use, the M15x25mm hexagonal head screw is fixed in a hexagonal pocket within the palm and by using a hexagonal cover and three screws.
The opposable finger is fixed on the palm using a M5 screw and a nut. The nut can slide within a palm circular slot so that the user to be able to tight the screw-nut with only one hand by using a screwdriver. The opposable finger rotational movement is blocked using a locking washer and by threading the M5 screw.
In order to reduce the cost, the prosthetic has a small number of components which can be manufactured by 3D printing: palm, three fingers and a cover. Standard metallic components are also used: M15x25mm screw, 3 M3x5mm screws, M5x30mm screw and a locking washer. Another design option for the opposable finger is to include also a threaded cylindrical part, instead of the M5 screw. Version 2 is also possible for palm part. Also, in order to make it easier to print, the circular part of the palm can be attached using screws by the trapezoidal part.
On the circular shape of the palm and opposable finger, lines markers can be drawn by each user so that by aligning them to indicate what object can be accommodated in what finger’ position.