I can extract side effects.

Chapter 602 Connecting Nerves, Functional Tests

In the laboratory, a map of sensory nerve distribution in the hand appears on the monitor.

"The sensation in the hand is mainly related to three nerves, namely the median nerve, ulnar nerve, and radial nerve."

"The sensory branch of the median nerve is mainly distributed in the thumb, index finger, middle finger, and 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 branch of the radial nerve distributes to the upper arm, dorsal forearm, and back of the hand."

"These three sensory nerves run along the forearm, the upper arm, and up until they join the brachial plexus, a bundle of nerves. As shown in the picture."

Three red curves are drawn sequentially on the distribution map, pointing out 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 information of the hand sensors in the corresponding parts into nerve electrical pulse signals, and transmit them to the three nerves through the extremely thin micro-nano electrode needles, and then we can detect the effect of the bionic arm."

Wang Dali smiled proudly: "Thanks to another project I have in hand, a painless injection needle that imitates the mouthparts of mosquitoes, using a flexible nano-metal material, I think it is very suitable for connecting arm nerves. Electrode needles, so I used them."

"After the nano-electrode needle is inserted into the human body, it is completely painless and painless. Due to its excellent biocompatibility, there will be no rejection or infection."

He picked up a piece of metal the size of a thumbnail, densely dotted with long needles thinner than a hair, shining with silver metallic luster.

Wang Dali held the long needle and bent it hard, and the long needle fell down like wheat blown by the wind.

He let go of his hand lightly, and the long needles were like springs, and with a swipe, they stood upright, like steel needles on a hedgehog.

"See, this metal is very flexible. It can be straight and bent, and it is not easy to break. There is no blood and no feeling when it is pierced into the arm. After the overall test, the performance is very good, which perfectly meets the needs of our project."

"Hey, this needle is really good for pricking people, especially after it's powered on, tsk tsk~ the taste must be sour!"

Thinking of the wonderful point, Wang Dali couldn't help but let out a wretched smirk.

Wen Renlong couldn't help but sigh in admiration: "Amazing, you're the one who can play well."

Chen Yiqing looked at the two people speechlessly, and said expressionlessly: "Since you want to experience it so much, I can't refuse it. The next test subjects have been decided, and it's just you two."

"Ah?" The two were stunned for a moment: "What experiment?"

Chen Yiqing smiled slightly: "Of course I got the needle, 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 charmingly: "Beauty, brother is here to accompany you to conduct experiments."

Zhang Li covered her mouth and burst out laughing.

Chen Yiqing covered his forehead with his hands, he really couldn't see, he could only cough a few times, pretending that these two people were nothing, and then continued talking.

"Thanks to Wang Dali's hard work, anyway, the bionic hand is out of the liver, and various sensors are installed on the fingers, palm, and back of the hand, such as pressure sensors, temperature sensors, dynamic sensors, etc. Added a lot."

"Okay, let's not talk much, let's just look at the experiment for the effect."

Having said that, he couldn't help showing 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 on the hand during the experiment, can make the hand lose consciousness quickly."

"Who came first?"

Wang Dali was a little worried: "Your medicine is not accurate, is it? It won't be poisoned by anesthetic."

The medical student chuckled, "Don't worry, I've done an accurate test, and if it makes your hands go numb, it will never make your legs go numb."

Wang Dali curled his lips: "The gap between the hands and legs is a bit big, I'm even more worried after talking about it."

"Okay, Dali, where's your bionic arm?" Chen Yiqing hurriedly interrupted him and asked.

Wang Dali lifted a plastic bag from under the table, opened layers of tightly wrapped sponges, and revealed a delicate mechanical arm inside.

Chen Yiqing couldn't help but twitched the corner of his mouth: "You didn't pack it in a box, but just carried it 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 away, what's the matter with Fei? It's not to meet a client for a presentation, so it needs to be well packaged."

This bionic robotic arm is made of silver-gray metal, but compared with before, the whole hand is sprayed with a thick layer of gelatinous coating. It looks a bit nondescript, but it gives people a dummy in a clothing store. look and feel.

Now, even Zhang Li couldn't stand it anymore: "Brother Wang, isn't your hand a little rough?"

"Oh, you said that these colloidal coatings mainly imitate the touch of the skin, and the feel will be better."

"It's okay, rough is called a sample. I will test the function first today, and I will refine it later. It will definitely satisfy everyone."

Wang Dali said casually, checked it carefully, pressed the back of his hand a few times, and then nodded in satisfaction.

"You only have one hand, so how can I do the experiment?" Wen Renlong complained dissatisfied.

Wang Dali gave him a sideways glance: "I did this move, so naturally I will come first, and you will do it after I have tried it."

Wen Renlong didn't speak any more, he tacitly agreed to the order of the experiment.

Soon, a shot of anesthetic was precisely hit 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 vigorously with the index finger of his right hand: "The dosage is okay, I don't feel anything."

He poked his wrist again, and exclaimed in surprise: "Hey, I can still feel my wrist, young man, you can do this technique, and the numbness is precise enough."

The medical student smiled slightly, and under Chen Yiqing's guidance, marked the median nerve, ulnar nerve, and radial nerve on the arm.

Afterwards, a large area of ​​the arm was disinfected, and then the three nail-sized metal plates were pointed at the place, and the movements were gentle, but they were inserted firmly.

The fine long needles slowly sank into the arm muscles.

During the whole process, Wang Dali didn't feel much, he just felt like he was bitten by mosquitoes a few times.

Immediately afterwards, the neural machine interface wires on the robotic arm were connected to the metal sheet.

After finishing all this, the medical student took out a black belt and wrapped it up where the needle was inserted on Wang Dali's arm.

This is mainly done for insulation and fixation.

"Okay, the test has officially begun."

Seeing that everything was ready, Chen Yiqing turned on the switch of the bionic robotic arm with an order.

Everyone looked at the table in unison, and the bionic robotic arm was placed side by side with Wang Dali's own hand.

Wang Dali himself was also very nervous. He stared at the bionic hand with wide eyes, shouting crazily in his mind.

"Move, move! Move!"

However, the bionic hand did not move at all.

Chen Yiqing frowned, took out a brush, and gently brushed over the back of the bionic hand.

"Do you feel it?"

Wang Dali shook his head: "No."

Chen Yiqing put down the brush, pinched the fingers of the bionic hand: "Is there any?"

Wang Dali looked blank: "Not yet."

Chen Yiqing got a little anxious, and slapped the bionic hand with a slap.

"It should be there now, right?"

Wang Dali was about to cry: "What's the matter, it's still not there."

Chen Yiqing was completely anxious, and with a bang, he punched it down.

"If there is no more, I will pour a glass of boiling water on your broken hand."

Wang Dali yelled out, and burst into tears.

"Nimma, the current was so high just now that it almost paralyzed me."

Chen Yiqing withdrew her hand shyly: "I'm sorry, I used too much force."

Wang Dali wiped his tears with his right hand, and said with a mournful face: "It's all my fault, I was always electrocuted before, this one is a little dull, I didn't even feel the electric current that was too small."

Everyone was silent for a while, and they never thought that this would be the reason.

Chen Yiqing touched his nose, a little embarrassed: "Then let's do the experiment with someone else."

Wang Dali immediately refused: "No, no, I have to experience it myself before I can make subsequent optimizations."

"Okay, hurry up and continue the test." Chen Yiqing held his nose and endured it.

When Wang Dali got used to it, he immediately felt the existence of this bionic hand.

He raised his bionic arm carefully, spread his five fingers, and then clenched them into fists.

I was pleasantly surprised to find that as long as you use your senses and initiate ideas, you can move your arms to complete any action you want.

He saw the glass of water on the table, so he reached out to hold it.

When the bionic hand touched the water cup, the sense of touch, temperature, and pressure of the palm of the hand, a series of information, were immediately transmitted back.

It's 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 in.

He could clearly feel the movement of his arm.

Whether it is shaking from side to side, the impact of the liquid inside and the wall of the cup, or the slight collision between the bottom of the cup and the table when the cup is placed on the table, they are clearly conveying information about the surrounding environment to him.

Such a sense of movement and such feedback are the most critical link to make the movement natural and the feeling real.

Wang Dali opened his eyes again, and had a new understanding of everything in front of him.

At this time, Chen Yiqing walked over with a box and opened it in front of Wang Dali.

Inside the box was a pile of black building blocks, about thirty pieces, each of which looked exactly the same, and there was no difference from the outside.

He looked at Wang Dali with great interest, blinked and said with a smile.

"These are the building blocks used for haptic feedback testing, and each one has a different hardness."

"You need to use the bionic hand to sort them by touch, from soft to hard, and arrange them in different degrees."

"See what step we can do?"

"It's not easy, look at me!" Wang Dali looked at the building blocks in the box, although he said so, his expression became serious.

He knows that this is 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 had pinched 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 be deformed with a little force.

He placed it on the table without any hesitation, keeping a long distance from the hard building block.

Immediately afterwards, he took out building blocks one after another.

Every time he took it out, Wang Dali immediately felt the hardness of the building blocks.

Then place them on the table in order from soft to hard.

He felt that the softness of some building blocks was very close, and he hesitated for a few seconds, pinching and pinching before making a decision.

In the end, he didn't even need to look at the arm. He only needed to grope around in the box to find a building block, perceive its hardness, and place it in the correct position on the table.

In the end, it took less than 5 minutes in total.

He finally took out all the building blocks in the box and placed them on the table one by one.

clap clap clap!
There was a burst of warm applause.

Everyone couldn't help applauding the wonderful performance of the bionic hand.

Amid the applause, Chen Yiqing smiled lightly, grabbed all the building blocks with both hands, and threw them all into the box.

He shook the box to mix the blocks together, then pushed them over again.

"Now, try to pick out of this pile of blocks a specific hardness."

"1 is the softest, 10 is the hardest, pick out those bricks that are 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 to my heart.

He suddenly understood how those little white mice in the laboratory felt.

Sure enough, when designing a series of test tasks, it was very interesting and exciting.

But if you do these tests yourself. . .

He would rather die than be a guinea pig anymore.

Let the disabled experience the joy of having an arm again.

They would certainly like to be guinea pigs and complete various tests of arm function tasks.

Wang Dali's thoughts turned, and he made a decision in an instant.

"Oh, I seem to feel something in my hand, and the anesthetic may have failed."

He said with a sad face: "Although I am willing to try, this opportunity can only be given to Aaron."

The medical student scratched his head, a little puzzled: "It shouldn't be, but it's okay, maybe your constitution is not sensitive to this anesthetic, I will guarantee the dose next time."

Wang Dali shook his head quickly: "I decided to stick to my original intention as a scientific researcher, and let patients experience the joy brought by new products without going on the field myself."

In this way, Wang Dali successfully got rid of the fate of the mouse, became a happy onlooker, and recorded the experimental data.

(End of this chapter)