Now European researchers of the projects NanoBioTact and NanoBioTouch delve deep into the mysteries of touch and have developed the first sensitive artificial finger.
The main scientific aims of the projects are to radically improve understanding of the human mechano-transduction system and tissue engineered nanobiosensors. Therefore an international and multi disciplinary team of 13 scientific institutes, universities and companies put their knowledge together. “There are many potential applications of biometric tactile sensoring, for example in prosthetic limbs where you´ve got neuro-coupling which allows the limb to sense objects and also to feed back to the brain, to control the limb. Another area would be in robotics where you might want the capability to have sense the grip of objects, or intelligent haptic exploration of surfaces for example”, says Prof. Michael Adams, the coordinator of NanoBioTact.
The scientists have already developed a prototype of the first sensitive artificial finger. It works with an array of pressure sensors that mimic the spatial resolution, sensitivity and dynamics of human neural
tactile sensors and can be directly connected to the central nervous system.
Combined with an artificial skin that mimics a human fingerprint, the device´s sensitivity to vibrations is improved. Depending on the quality of a textured surface, the biomimetic finger vibrates in different ways, when it slides across the surface. Thereby it produces different signals and once it will get
used by patients, they could recognise if the surface is smooth or scratchy. “The sensors are working very much like the sensors are doing on your own finger”, says physicist Dr. Michael Ward from the School of Mechanical Engineering at the University of Birmingham.
Putting the biomimetic finger on artificial limbs would take prostheses to the next level. “Compared to the hand prostheses which are currently on the market, an integrated sense of touch would be a major
improvement. It would be a truly modern and biometric device which would give the patient the feeling as if it belonged to his own body”, says Dr. Lucia Beccai from the Centre for Micro-Robotics at the Italian Institute for Technology. But till the artificial finger will be available on large scale a lot of tests will have to be done. Nevertheless with the combination of computer and cognitive sciences, nano- and biotechnology the projects NanoBioTact and NanoBioTouch have already brought us a big step closer to
artificial limbs with sensitive fingers!
A touchy feely artificial finger
An artificial finger could benefit patients with a missing finger in many ways. The most obvious, would be to addsensory feedback to their prosthesis. In addition, remote surgery could also benefit from a well-functioning artificial finger. Thus, a surgeon in, say, France could examine a patient in Nigeria and get an authentic feel, almost as if they were in the same location.
A European research consortium is working on an artificial finger in the EU funded project Nanobiotact (Nano-engineering biomimetic tactile sensors). Together they are combining expertise in material science, neurology, nanotechnology and robotics.
Their artificial finger will mimic the dynamics, sensitivity and spatial resolution of human tactile neural sensors found in our finger pads through biomimetic sensors. These are very small silicon devices that create electrical signals from tactile forces.
The ultimate aim of the project is make an artificial finger that could give sensory feedback through connection with the central nervous system. This would require an in-depth study of human mechanoreceptors. In addition, gaining an understanding of the coding mechanism in the nervous system for sensing would also be key. Finally, a computer linked to the sensors will behave similar to our brain through interpretation of hundreds of very complex signals.
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