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Anatomically accurate artificial finger printed on a 3D printer
American and Japanese engineers have created an artificial analogue of the finger that relatively accurately repeats its structure, including the annular ligaments and flexor tendons.
The peculiarity of this development is that it was printed in one operation using a 3D printer that works with different materials. The paper was presented at the UR 2020 conference.
Robots with a similar design to the human body are used both by themselves and as prosthetic arms or legs. In robotic arms, the hands often externally and in function repeat the work of real hands, but from the inside they are arranged differently: often they have electric motors between each pair of phalanges. In humans, the fingers bend in a different way. In them, on the phalanges or between them, there are annular ligaments through which the flexor tendons pass. Above, in the forearm, these tendons pass into muscles - deep and superficial finger flexors. There are robotic arms in which this mechanism is repeated with the help of cables passing through the fingers, but they are still not completely similar in design to a real hand.
A team of engineers led by Shinichi Hirai of Ritsumeikan University has 3D-printed a more anatomically correct artificial finger.
It consists of three phalanges, three tendons, as well as several connecting elements that mimic cartilage and other tissues. The authors created models of these elements based on data on the structure of real fingers.
One of the features of the finger is that, although it consists of different functional elements with different mechanical properties, it is actually a single monolithic part. This was achieved with a 3D printer capable of printing two materials at once in one go. The engineers printed the bones of the phalanges with hard and hard plastic, the cartilage was made of a soft and elastic polymer, and the rest of the elements were printed with a mixture with a certain ratio of the two materials, which made it possible to achieve the properties as close as possible to real tissues.
They ended up with a finger that can be flexed with polymer analogs of tendons passing through analogs of the annular ligaments. They attached a single actuator to the ends of the tendons, which could move up or down to change the tension in the tendon. The engineers also ran simulations and found that the behavior of a real finger is accurately described by the model. They suggested that the method they developed in the future will allow the creation of more accessible, but at the same time, more similar in properties, artificial hands for prostheses or robots.
In addition to imitating the structure of hands, prosthetic developers are also trying to recreate the sense of touch, which is one of the main ways to study the surfaces of objects in everyday interaction. For example, Swiss engineers have created a finger with piezoresistive sensors that read surface irregularities and send impulses to the median nerve of the hand.
Grigory Kopiev
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Robotic Finger Changes Brain Ideas About Hand / Sudo Null IT News0001
In testing the Third Thumb robotic prosthesis, researchers found that participants trained to use the thumb perceived it as part of the body. Frequent use of the prosthesis has affected the brain's representations of the hand.
English designer and Royal College of Art London alumnus Dany Claude designed "Third Thumb" in 2017. The prosthesis can replace the thumb or expand the functions of a full hand. With an extra finger, people have already learned how to pick up more objects in the brush and hold them firmly, as well as masterfully play the guitar and facilitate actions where another finger would be useful.
The device is 3D printed and consists of a finger frame, palm pad, wrist band and two sensors embedded in the shoes under the toes. One sensor, when pressed, adjusts the tension of the cable in the artificial finger, the other turns the finger in the desired direction. The signal from the sensors is transmitted via Bluetooth to two motors inside the bracelet, which change the position of the finger.
After developing the prosthesis, Dani Claude was invited to join a team of neuroscientists at the University of California, Los Angeles, to study the brain's adaptation to the increase in the number of limbs in the body. The team's goal was to understand whether the human brain can fully recognize an additional part of the body and how the prosthesis affects its work.
The study involved 30 people. The scientists formed two groups. The first group of 20 people who were given Third Thumb prostheses with permission to take them home, and a control group of 10 people with static prostheses. The groups included people with a full set of fingers and toes.
The subjects were assigned daily training sessions, which they did for five days. Participants lifted objects, formed structures, learned to write, and manipulated fragile and complex objects such as wine glasses. Participants also built brick towers while blindfolded or while solving math problems. These and other exercises are aimed at increasing motor control using prostheses.
