#科技头条#【假肢也能感受到人间冷暖了】

#科技头条#【假肢也能感受到人间冷暖了】斯坦福大学的科学家使用碳纳米管模压成小金字塔微观结构发明了一种有知觉的假肢,截肢者能通过大脑控制假肢,并像正常皮肤一样感受周围的世界,如热、压力、水分等。除此之外它还能缓解幻肢疼痛,修复肢体的损伤,帮助残疾人更为独立的生活。http://www.looooker.com/archives/18210

Could prosthetic limbs soon come with a sense of TOUCH? Smart skin detects heat, pressure and moisture
Many prosthetic devices can be controlled using nerves, muscles or even the brain but owners are still unable to feel if an object is scalding hot

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Now scientists have used flexible organic circuits and specialised pressure sensors to create their 'skin' that can sense the force of static objects
Also transferred sensory signals to the brain cells of mice in experiments
A 'smart' skin has been created that could help amputees 'feel' the world around them using their artificial limbs.
An increasing number of hi-tech prosthetics can be controlled using nerves, muscles or even the brain but owners are still unable to feel if an object is scalding hot, or about to slip out of their grasp.
The skin is made from flexible organic circuits and pressure sensors and it is hoped this revolutionary artificial layering will provide prosthetics with sensation for the first time.

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To solve this problem, the team used carbon nanotubes moulded into tiny pyramid microstructures to create the skin.
These are particularly effective at tunnelling the signals from the electric field of nearby objects to the receiving electrode in a way that maximises sensitivity.
Transferring the digital signal from the artificial skin system to the brain cells of mice was also a challenge.
Conventional light-sensitive proteins used in optogenetics - a technique that uses light to control cells in living tissue - don't stimulate the neural spikes long enough for digital signals to be sensed.

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The researchers, therefore, engineered new optogenetic proteins able to cope with longer intervals of stimulation.
Applying these newly engineered optogenic proteins to interneurons in the region of the mice brains called somatosensory cortex prolonged the stimulation interval.

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This caused them to fire in accordance with the digital stimulation pulse from the skin.
Dr Benjamin Tee, of Stanford University, said: 'Neurally-controlled prosthetic devices improve mobility and independence for disabled people.
'The addition of tactile sensing can benefit the utility of these neuroprosthetics by enhancing motor control and relieving phantom limb pain associated with limb loss.

链接:http://www.dailymail.co.uk/sciencetech/article-3274258/Could-prosthetic-limbs-soon-come-sense-TOUCH-Smart-skin-detect-heat-pressure-moisture.html


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