Most people may not know that one out of every six people may have a stroke; in Sweden, there are 16,000 strokes per year, and two-thirds of them will be paralyzed. Extended training allows patients to regain control of their arms and hands. Of course, the degree of damage to the brain directly affects the degree of recovery. This is the result of the traditional physiotherapy capabilities, and now we have a new alternative - robots.
Roger Gassert, a professor at the Federal Institute of Technology in Zurich, has developed a series of robotic technology devices that can train arm functions that can be part of the rehabilitation of stroke patients. However, whether it is physiotherapy or robot-assisted treatment, the treatment consists of one or two training sessions per day, which is very stressful for the patients, because they spend a lot of time on the way to and from the treatment center.
The exoskeleton is transformed into a training robot
"My point is, don't let the patients go to the clinic for rehabilitation training. On the contrary, we have to make this exercise into every bit of their home life," Gassert said. This is his and Japan. The idea that Professor Jumpei Arata of Kyushu University got after the exchange (Arata worked in Gassert's lab during the 2010 academic holidays).
“First, the existing exoskeleton is too heavy, which makes it difficult for patients to lift their hands. Second, they also have difficulty perceiving the presence of objects. Third, when they want to grab objects, They don't know how much effort they should make. So, we want to invent a model that gives them more freedom so that they can perform everyday tasks and achieve motor and physical functions," Gassert said. In response to this problem, Arate invented a finger triple leaf spring. The engine moves in the middle of the spring, which transmits power through the other two springs to various parts of the finger. In this way, the finger can automatically adapt to the shape of the object, so that the patient can grasp the object.
However, this integrated power setting increases the weight of the exoskeleton to 250 grams, which is already very heavy for patients in clinical trials. The solution to this problem is to retrofit the engine to the patient's back so that power can be transferred to the exoskeleton through the bicycle brake line. The hand device model weighs less than 120 grams, but it is strong enough to lift a bottle of one liter of mineral water.
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