Biomechatronic Hand
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computer science crazy
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21-09-2008, 09:25 AM


The objective of the work describe in this paper is to develop an artificial hand aimed at replicating the appearance and performance of the natural hand the ultimate goal of this research is to obtain a complete functional substitution of the natural hand. This means that the artificial hand should be felt by the user as the part of his/her own body (extended physiological proprioception(EPP) ) and it should provide the user with the same functions of natural hand: tactile exploration, grasping , and manipulation ("cybernetic" prosthesis).

Commercially available prosthetic devices, as well as multifunctional hand designs have good (sometimes excellent) reliability and robustness, but their grasping capabilities can be improved. It has been demonstrated the methodologies and knowledge developed for robotic hands can be apologies and knowledge developed for robotic hands can be applied to the domain of prosthetics to augment final performance. The first significant example of an artificial hand designed according to a robotic approach is the Belgrade/USC Hand.

Afterwards, several robotic grippers and articulated hands have been developed, for example the Stanford/JPL hand and the Utah/MIT hand which have achieved excellent results. An accurate description and a comparative analysis of state of the art of artificial hands can be found in. These hands have achieved good performance in mimicking human capabilities, but they are complex devices requiring large controllers and their mass and size are not compatible with the strict requirements of prosthetic hands.

In fact, the artificial hands for prosthetics applications pose challenging specifications and problems, as is usually the case for devices to be used for functional replacement in clinical practice. These problems have forced the development of simple, robust, and reliable commercial prosthetic hands, as the Otto Brock Sensor Hand prostheses which is widely implanted and appreciated by users. The Otto Bock hand has only one degree of freedom(DOF), it can move the fingers at proportional speed from 15-130 mm/s and can generate grip force up to 100 N.

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.

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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04-08-2009, 02:34 PM

pls send me some more details about biomechatronic hand....i need it as soon as pls send it soon
computer science crazy
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27-08-2009, 02:06 PM

.pdf   Design of Biomechatronic Hand.pdf (Size: 934.46 KB / Downloads: 217)

.pdf   Biomechatronic Hand.pdf (Size: 1.09 MB / Downloads: 275)

An ideal upper limb prosthesis should be perceived as part of the natural body by the amputee and should replicate sensory-motor capabilities of the amputated limb. However, such an ideal cybernetic prosthesis is still far from reality: current prosthetic hands are simple grippers with one or two degrees of freedom, which barely restore the capability of the thumb-index pinch. The paper describes the design and fabrication of a prosthetic hand based on a biomechatronic and cybernetic approach. Our approach is aimed at providing natural sensory-motor coordination to the amputee, by integrating biomimetic mechanisms, sensors, actuators and control, and by interfacing the hand with the peripheral nervous system

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16-07-2011, 09:39 AM

plz send me ppt on biomechotronic hand

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