Li Chong's process of educating Li Chengqian is always so casual.

After discussing the issue of the guards with Li Chengqian, Li Chong put on his cloak and went back.

When he got back, he had to think about how to get a mercury sphygmomanometer.

First of all, he may need a craftsman from the Western Regions who can make clear glass.

But even if you get one of these craftsmen.

This rubber tube, he won't do either.

If you can make both of these things, then the rest will be easy to do.

It's hard!

Looking at Li Chong's departing figure, Li Chengqian felt that his teacher was particularly tall.

……

Following.

Li Chong first went to Sun Simiao's house in Chang'an.

I learned from Sun Simiao about how they usually store mercury.

It is also very important to learn from the ancients and not work behind closed doors.

Then it soon became clear that in general, they would turn mercury into cinnabar, which is mercury sulfide.

Since mercury sulfide is a solid mineral, it is much more convenient to transport and store.

The question is...... This is not the answer Li Zhong wants.

Seeing Li Chong frowning.

Sun Simiao said: "You said the blood pressure monitor, you have an idea?" ”

Li Chong took out his schematic diagram, "The idea is there, but with the current conditions, it can't be done at all." ”

Sun Simiao looked at his schematic diagram.

This is a schematic diagram ......

It can only be said to be refreshing.

Seeing that Sun Simiao was so curious, Li Chong told him the principle by the way, "What about this mercury, it is stored here, and it can be cheered up here......"

"Then you can't do without the mercury you say? Since you say mercury is so dangerous. ”

"That's because if you don't use mercury, the glass tube would have to be very high. But it's not impossible to give it a try...... What is the density of this mercury? ”

Seeing Li Zhong look at himself.

Sun Simiao can only say, you ask me, who do I ask.

And......

"What does this density mean?"

"The so-called density is ...... I forgot about it too. ”

Sun Simiao: "......"

"If it's water, then using the bladder of an ordinary pig as an air bag is almost the same. Speaking of which...... By extension, is it possible to do the same with rubber hoses? ”

Li Chongyi slapped the table!

Although the airtightness is very doubtful, at least, if the conditions do not allow, it can only be tried in this way.

At most, the error is larger.

Anyway......

He didn't think about how precise he was, he just needed a relative value.

"What about you?"

Sun Simiao said: "According to what you said, I have also found some drugs that may help lower blood pressure." Speaking of which, how did Mr. Li know so much? ”

"Maybe I've learned more."

"Oh."

Sun Simiao nodded slightly

- Then you didn't say it or not!? What the old man wants to know more is actually where you learned this. But......

It's like he often begs others to show him a prescription, and many times, this prescription is a secret that has been passed down from other people's ancestors.

Bachelor Li, this kind of should belong to the kind of secret that is not passed on.

"Let's make the stethoscope first."

After that, Li Chong said again.

After saying that, Li Zhong fixed there.

Sun Simiao saw that he didn't move for a while, and said, "Didn't you say to make the stethoscope?" ”

Li Chong replied: "I don't want to move." ”

This ancient life is good, the pace of life is slow, and he is about to become the sloth called Lightning.

I thought about it.

Let Li Chengqian do it.

Young people, running more is more conducive to exercise.

Afterwards......

Li Chong asked Sun Simiao's apprentice to send a letter to Li Chengqian, and then asked Li Chengqian to send a message to his father, and then asked Li Er to send one of the best craftsmen in the Tang Dynasty.

By the time this process was completed, when Li Chong met the craftsman, it was already early the next morning.

The craftsman's name is Lao Liu, because he is in his own home, and he is the sixth.

Li Zhong quickly told him how to make a stethoscope.

In fact, Li Chong is not sure whether he did it or not.

However, let the other person do it first.

After the other party learned of Li Chong's needs, he naturally worked overtime and knocked out the stethoscope.

Three days later.

The first generation of stethoscopes was made, all of which were copper tubes, and no rubber was used.

Not to mention, Li Chengqian's heartbeat is quite strong.

Sun Simiao also listened, this is the first time he has tried to find the patient's lesions by amplifying the sound of the human internal organs.

After listening, he said: "Although the old man can also find out the problem of the organs by taking the pulse, but this method is not a simple trick, Mr. Li. ”

Li Chong said: "In fact, this is not a trick at all, and it takes a little bit and slowly accumulating experience to truly achieve the purpose of curing diseases and saving people." However, it can be used to corroborate each other with the pulse, which is true. ”

After Li Zhong finished speaking, he said to the craftsman: "The one you have made now is good, but there are still some noises, you go back and try again, and see if you can increase the thickness of the copper pipe wall, or reduce the inner diameter of the copper pipe, so that the sound you hear is clearer." ”

The craftsman nodded in response.

This stethoscope is there.

Li Zhong then also tried to study why he put a stethoscope in his arm sleeve when measuring blood pressure.

But since he is not a professional, it seems that he has not found anything special.

So how do other people measure their blood pressure?

This made Li Chongbai puzzled.

But he remembered very well that the doctor did just that, yes.

Could it be a deflate?

Right!

This qi should be released slowly and little by little.

There are generally two blood pressures, as if what is diastolic blood pressure, and what is the other called?

Why there are two readings, I'm afraid, is heard through a stethoscope.

These are all contained in the 30% that Li Chong said before and that he did not know.

Therefore......

For the next period of time, Li Chong kept using Li Chengqian as an experimental subject.

Except for the glass part, the sphygmomanometer was slowly penetrated by Li Zhong little by little.

Sun Simiao's side.

It is also to combine pulse control with stethoscope, and even personally go to some patients suffering from qi diseases to test the effect of stethoscopes.

All I can say is......

This works a little surprisingly good.

He even found that if he used a stethoscope with a pulse, it would be more conducive to him to judge the patient's condition more accurately.

It's just a bit of a pity.

The person who invented this thing, that is, Mr. Li, did not know the use of this thing.

That can only be done by him with years of experience, slowly completing the usage of this thing little by little.

For example, if you hear a sound, you can roughly judge what kind of disease it is.