According to analysis of the state of art, the main
problems to be solved in order to improve the performance of prosthetic
hands are
1) lack of sensory information gives to the amputee;
2) lack of “natural” command interface;
3) limited grasping capabilities;
4) Unnatural movements of fingers during grasping.
2) lack of “natural” command interface;
3) limited grasping capabilities;
4) Unnatural movements of fingers during grasping.
In order to solve these problems, we
are developing a biomechatronic hand, designed according to mechatronic
concepts and intended to replicate as much as possible the architecture
and the functional principles of the natural hand.
The first and second problems can be
addressed by developing a “natural” interface between the peripheral
nervous system (PNS) and the artificial device (i.e., a “natural” neural
interface (NI) to record and stimulate the PNS in a selective way. The
neural interface is the enabling technology for achieving ENG-based
control of the prostheses, i.e., for providing the sensory connection
between the artificial hand and the amputee. Sensory feedback can be
restored by stimulating in an appropriate way user’s afferent nerves
after characterization of afferent PNS signals in response to mechanical
and proprioceptive stimuli. The “biomechatronic” design process
described above is illustrated in the scheme.
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