In the laboratory, a map of the distribution of sensory nerves in the hand appears on a monitor.
"The sensation in the hand is mainly related to three nerves, namely the median nerve, ulnar nerve, and radial nerve."
"The sensory branches of the median nerve are mainly distributed in the thumb, index finger, middle finger, and the half of the palm where these fingers are connected."
"The sensory branch of the ulnar nerve is mainly distributed in the wrist joint, ring finger and little finger, and the connected half of the palm."
"The sensory branches of the radial nerve are distributed in the upper arm, dorsum of the forearm, and dorsum of the hand."
"These three sensory nerves go up along the forearm and upper arm until they merge into the brachial plexus. As shown in the picture."
Three red curves draw across the distribution map in sequence, indicating the direction and distribution of the three nerves.
Chen Yiqing stood in front of the screen with a look of sincere joy on his face.
"So we only need to convert the hand sensor information at the corresponding part into nerve electrical pulse signals, and transmit them to these three nerves through extremely fine micro-nano electrode needles, so that we can detect the effect of the bionic arm."
Wang Dali said with a proud smile: "Thanks to another project I have, a painless injection needle that imitates the mouthparts of mosquitoes. It uses a flexible nanometal material. I think it is very suitable for connecting arm nerves." Electrode needle, so I used it."
"After this kind of nanoelectrode needle is inserted into the human body, it is completely painless and sensationless. Due to its excellent biocompatibility, rejection or infection will not occur."
He picked up a piece of metal the size of a thumbnail. It was densely covered with long needles that were thinner than a hair and shone with a silver metallic sheen.
Wang Dali held the long needle and bent it hard. The long needle fell down like wheat blown down by the wind.
He gently let go of his hand, and the long needles were like springs. With a flick of the brush, they stood up straight, like steel needles on a hedgehog.
"As you can see, this kind of metal is very flexible. It can be straight and bent, and it is not easy to break. There is no blood or any feeling when it is pierced into the arm. After the overall test, the performance is very excellent, which perfectly meets the needs of our project."
"Hehe, this needle is great for pricking people, especially after it is powered on, tsk tsk~ The taste must be sour and refreshing!"
Wang Dali thought of the wonderful idea and couldn't help but let out a lewd smile.
Wen Renlong couldn't help but admired: "Awesome, you are so good at it."
Chen Yiqing looked at the two people speechlessly and said expressionlessly: "Since you want to experience it so much, it's hard for me to refuse. The next test subjects have been decided, and it's just you two."
"Ah?" The two of them were confused for a moment: "What kind of test?"
Chen Yiqing smiled slightly: "Of course I got an injection, turned on the electricity, and experienced the feeling of the bionic robotic arm."
Wang Dali was instantly overjoyed: "Chen Bo, you still understand me."
Wen Renlong tilted his mouth at Zhang Li and smiled evilly: "Beauty, I'm here to do experiments with you."
Zhang Li covered her mouth and burst into laughter.
Chen Yiqing covered his forehead with his hands. He really couldn't see it. He could only cough twice, pretending that the two people were nothing, and then continued talking.
"Thanks to Wang Dali's hard work, the bionic hand has grown out of the liver, and has installed various sensors on the fingers, palm, and back of the hand, such as pressure sensors, temperature sensors, dynamic sensors, etc. Anyway, it is It’s a lot added.”
"Okay, without further ado, let's just see how effective it is."
Speaking of this, he couldn't help but show excitement on his face.
Beside the table, a young medical student stood up and opened the small box in front of him with a click.
Then he slowly took out a syringe and looked at Wang Dali and Wen Renlong.
"A shot of lidocaine, injected into the hand during the experiment, can make the hand lose consciousness quickly."
"Who comes first?"
Wang Dali was a little worried: "Isn't your medicine accurate? You won't be poisoned by anesthetics, right?"
The medical student chuckled: "Don't worry, I have done accurate tests. If it makes your hands numb, it will never make your legs numb."
Wang Dali curled his lips: "The gap between the hands and legs is a bit big. Now that I have told you, I am even more worried."
"Okay, Dali, where is your bionic arm?" Chen Yiqing quickly interrupted him and asked.
Wang Dali lifted a plastic bag from under the table, opened the layers of tightly wrapped sponges, and revealed a delicate robotic arm inside.
Chen Yiqing couldn't help but twitch the corner of his mouth: "You didn't bring a box to put it in, but just brought it over in a plastic bag. It's too crude. Aren't you afraid of bumps on the road?"
Wang Dali said carelessly: "It's not that far. Why do you need to do that? It's not a presentation to customers, and it needs to be packaged well."
This bionic robotic arm is made entirely of silver-gray metal. However, compared to before, the entire hand has been sprayed with a thick layer of gel coating. It looks a bit nondescript, but it gives people the impression of a dummy in a clothing store. perception.
Now, even Zhang Li couldn't stand it anymore: "Brother Wang, are your hands a little rough?"
"Oh, you said these gel coatings mainly imitate the touch of skin, so they feel better."
"It's okay. Rough things are called samples. Let's test the functions today. I'll fine-tune them later. I'll definitely satisfy everyone."
Wang Dali said casually, checked it carefully, pressed lightly on the back of his hand a few times, and then nodded with satisfaction.
"You only have one hand, so how can I do the experiment?" Wen Renlong complained dissatisfied.
Wang Dali glanced at him: "I did this hand, so of course I'll do it first. I'll try it on you before you do it."
Wen Renlong didn't speak anymore, which was regarded as acquiescing to the order of the test.
Soon, an injection of anesthetic was accurately injected on the back of Wang Dali's sterilized hand.
He quickly lost feeling in his left hand.
Wang Dali poked the back of his hand with his right index finger: "The dosage is okay, I don't feel anything."
He poked his wrist again and cried out in surprise: "Hey, I can still feel it in my wrist. Young man, your technique is good. The numb areas are precise enough."
The medical student smiled slightly, and under Chen Yiqing's guidance, marked the locations of the median nerve, ulnar nerve, and radial nerve on the arm.
Afterwards, a large area of the arm was disinfected, and then three metal pieces the size of a fingernail were pointed at the right place and inserted gently but forcefully.
The long and fine needle slowly sinks into the arm muscles.
During the whole process, Wang Dali didn't feel much. He only felt as if he had been bitten by mosquitoes a few times.
Immediately afterwards, the neural machine interface cable on the robotic arm was connected to the metal piece.
After doing all this, the medical student took out a black tie and wrapped it entirely around the place where the needle was inserted in Wang Dali's arm.
This is done mainly for insulation and fixation.
"Okay, the test has officially begun."
Seeing that everything was ready, Chen Yiqing gave an order and turned on the switch of the bionic mechanical arm.
Everyone looked at the table in unison, where the bionic robotic arm and Wang Dali's own hand were placed side by side.
Wang Dali himself was very nervous. He stared at the bionic hand with his eyes wide open, shouting crazily in his head.
"Move, move! Move quickly!"
However, the bionic hand did not move at all.
Chen Yiqing frowned, took out a brush, and gently brushed it on the back of the bionic hand.
"Do you feel it?"
Wang Dali shook his head: "No."
Chen Yiqing put down the brush and pinched the fingers of the bionic hand: "Is it there now?"
Wang Dali looked blank: "Still not."
Chen Yiqing got a little anxious and slapped the bionic hand.
"It should be done by now, right?"
Wang Dali was about to cry: "What's going on? It's still not happening."
Chen Yiqing was completely anxious, and punched it with a bang.
"If not, I'll pour a glass of boiling water on your broken hands."
Wang Dali screamed and burst into tears.
"Nima, the current was so strong just now that it almost gave me electrocution."
Chen Yiqing retracted his hand and said: "Sorry, I used too much force."
Wang Dali wiped his tears with his right hand and said with a sad face: "It's all my fault. I used to get electric shocks all the time. This part is a little slow. I didn't even feel the tiny electric current."
Everyone fell silent immediately, never expecting this to be the reason.
Chen Yiqing touched his nose and felt a little embarrassed: "Let's switch to someone else to do the experiment later."
Wang Dali immediately refused: "No, no, I have to experience it myself first before I can make subsequent optimizations."
"Okay, hurry up and continue the test." Chen Yiqing pinched his nose and endured it.
When Wang Dali adapted, he immediately felt the presence of this bionic hand.
He carefully raised his bionic arm, spread his fingers, and then clenched them into a fist.
I was surprised to find that as long as I use my feelings and thoughts, I can move my arms to complete any action I want.
He saw the water glass on the table and reached out to hold it.
When the bionic hand comes into contact with the water cup, a series of information about the water cup's touch, temperature, and palm grip pressure are immediately transmitted back.
Just like using your own native arm.
This wonderful feeling made Wang Dali instantly ecstatic.
He closed his eyes, picked up the water glass, and gently swung it left and right in the air, feeling the sloshing of the liquid inside.
Although he no longer relies on vision to adjust his movements, the sense of movement returned by the bionic hand can still tell his brain in real time what kind of movement his arm is making.
He could clearly feel the movements of his arms.
Whether it is shaking from side to side, the collision between the liquid inside and the cup wall, or the slight collision between the bottom of the cup and the table when the water cup is placed on the table, information about the surrounding environment is clearly conveyed to him.
This sense of movement and feedback are the most critical part of making movements natural and feelings real.
Wang Dali opened his eyes again and had a new understanding of everything in front of him.
At this time, Chen Yiqing came over with a box and opened it in front of Wang Dali.
There is a pile of black building blocks in the box, about thirty pieces in total. Each piece looks exactly the same, and there is no difference in appearance.
He looked at Wang Dali with interest, blinked and smiled.
"These are building blocks used for tactile feedback testing, and each piece has a different softness and hardness."
"You need to use the bionic hand to sort them by touch, from soft to hard, and arrange them in different degrees."
"Let's see how far we can go?"
"This is not easy, look at me!" Wang Dali looked at the blocks in the box. Although he said this, his expression became serious.
He knew that this was a test and a challenge.
The bionic hand reached into the box and gently picked up a building block.
Almost instantly, Wang Dali felt as if he was holding a piece of metal, which was extremely hard.
He quickly took out the building block and placed it on the table.
Then, he reached into the box again and pinched a building block.
This time, what Wang Dali felt was a kind of softness like plasticine, which seemed to deform with a little force.
He put it on the table without hesitation, a long distance away from the hard block.
Immediately afterwards, he took out building blocks one after another.
Every time he took it out, Wang Dali immediately felt the softness and hardness of the building blocks.
Then place them on the table in order from soft to hard.
There were a few bricks that he felt were very close in softness. He hesitated for a few seconds and squeezed them again and again before making a decision.
Later, he didn't even need to look at his arm. He only needed to fumble around in the box for a while to find a building block, feel its hardness, and place it in the correct position on the table.
In the end, it took less than five minutes in total.
He finally took out all the blocks from the box and placed them on the table one by one.
Bang bang bang!
There was a burst of warm applause.
Everyone couldn't help but applaud the wonderful performance of the bionic hand.
Amidst the applause, Chen Yiqing smiled lightly, grabbed all the blocks with both hands, and threw them all into the box.
He shook the box, mixing the bricks together, and pushed it over again.
"Now, try to pick out the bricks from this pile that have a specific softness and hardness."
"1 is the softest and 10 is the hardest. Pick out those blocks with a softness around 5 and 6."
"Do it again."
"..." Wang Dali looked at him speechlessly, and suddenly wanted to punch that elegant smiling face.
At the same time, a feeling of being tired and unloved came over me.
He suddenly understood how those mice in the laboratory felt.
Sure enough, it was very interesting and exciting to design a series of test tasks.
But if you do these tests yourself. . .
He would rather die than stop being a guinea pig.
Let those with disabilities experience the joy of regaining their arms.
They would definitely be willing to be guinea pigs and complete a variety of arm functional task tests.
Wang Dali's mind turned and he made an instant decision.
"Oops, I seem to have feelings in my hands. The anesthetic may have worn off."
He said sadly: "Although I am willing to try, this opportunity can only be given to Aaron."
The medical student scratched his head, a little confused: "It shouldn't be, but it's okay. Maybe your body is not sensitive to this anesthetic. I will ensure the amount next time."
Wang Dali shook his head quickly: "I decided to stick to my original intention as a scientific researcher. I will not participate in the game myself and let patients experience the joy brought by the new product."
In this way, Wang Dali successfully escaped the fate of a white mouse, became a happy onlooker, and recorded the experimental data.
(End of chapter)
