Release date: 2018-06-27
On June 25th, the researchers have created an electronic skin that senses pain and touch. The prosthesis that wraps this electronic skin can help the amputated patient avoid injury. This electronic skin is a thin layer of rubber and fabric that covers the fingertips of the prosthetic hand and produces electrical impulses.
When the electronic skin is in contact with the object, these tiny pulses stimulate the nerves in the prosthesis to simulate a true touch. The research team has tested the electronic skin on an anonymous amputation patient, who said the experience is like an empty shell once again gaining life.
Perceived pain is vital to a full-featured limb because it helps us avoid danger and protect our body. Pain is of course annoying, but it is also necessary. With this electronic skin, the protective touch that the prosthesis once lacked is now able to be experienced by amputated patients.
Project researcher John K. Hopkins graduate Luke Osborn said: "Advances in prosthetic design and control mechanisms can help amputees recover lost functions, but they often lack significant tactile feedback or intuition." The Johns Hopkins University School of Medicine team used the complex neural network of human skin tactile receptors to create this electronic skin.
The prosthesis is getting more and more realistic, and the latest electronic skin can transmit real pain.
The sensor of the electronic skin is attached to the wearer's prosthesis by electrodes placed on the skin, and is similar to the way the true nerve transmits signals. Depending on the pulse pattern delivered by the electronic device, the electronic skin can transmit a range of sensations from light touch to pain. Osborn said: "With this tactile feedback, we can provide a real feeling for the amputee." This is really important because it brings us closer to creating a real upper limb prosthesis.
The researchers tested an electronic skin prototype on the anonymous amputee, who used the electronic skin to grab different objects. The research team also introduced an automatic pain response, which means that the hand throws away too sharp objects before they receive the brain instructions. The participant described the feeling of wearing this electronic skin: "After many years, I felt my hand again, just like an empty shell filled with life again."
This study suggests that it is possible to restore a range of tactile sensations to those who use prostheses. The research team plans to develop a device in the future that will give people a more complex set of touches. Osborn said: "It is really important to let people get all the touch, of course not only pain, but also the texture and temperature. In the future, we also plan to explore how to give more sensation to the amputee."
Source: NetEase Technology Report
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