After a long day of heavy classes, John did not feel as tired as the other students, and was still in good spirits, and pulled Peake and Luther to chat, and then rode his bicycle back home.

After dinner with the butler, John went to a room on the second floor.

There were only two people in the house, but there was a surplus of room, and in addition to making a study, John asked Hans to arrange a simple real room for him. Of course, it is said that it is a real yàn room, but in fact there are only some simple tools and materials inside.

Looking at a knick-knack on the table that was about to be completed, John couldn't help but smile on his face.

After nearly a month of hard work, this thing is finally finished. When he thought that he had made it completely from beginning to end, he couldn't help but be extremely satisfied. You know, the bicycle and the razor John only drew the structural drawing, and the specific manufacturing was completed by the workers, only this thing except for some accessories that need to be customized, and individual steps need to be outsourced, he is done by himself from beginning to end - from the selection of materials to the hand-made zuò, it is completely made!

"So, get it done today!"

In a happy mood, John quickly rolled up his sleeves and got busy on the table.

It was a thin tin box in the shape of a long box, somewhat similar to a wooden box for red wine, but a little flattened and a little longer, John lifted the upper layer of the box, and took out a few parts from it, revealing the internal structure: the lower part of the box was empty, and the upper part was composed of a long glass tube with a scale, which seemed to be very simple. What John pulled out of it was a stethoscope, something like a strip of cloth, a rubber ball, and a few rubber tubes.

Anyone in later generations will probably call out its name as soon as they see it, because it's so common!

This is a simple and crudely made mercury benchtop blood pressure monitor.

Carefully connecting the key components and the main body, then adjusting and modifying them, in just an hour, John's work was done.

Looking at the ugly little things in front of him, although John was slightly dissatisfied, he was still happy in the end.

It's the product of a moment of boredom.

After a long vacation, John's friends in Berlin either went home or traveled, and the few people left behind couldn't mingle every day, so after a week of wandering around, he inevitably got bored. Originally, this was the best time for him to get involved in the various real rooms, but after a busy year, John was really not interested in the old real rooms, and finally decided to find something to do for himself.

After a day of deliberation, John finally decided to improve the rudimentary clinical examination methods of the era. However, he didn't have enough instruments and equipment at hand, and he didn't have a competent assistant, so after thinking about it, he could only make the simplest one, that is, a blood pressure monitor......

t,p,r,bp。

These English capital letter abbreviations are very common, and many people in later generations are very familiar with them, even if they are not familiar with them, I am afraid that they have been seen many times, because when everyone goes to the hospital to see a doctor, they will basically appear in the medical record book.

Body temperature, pulse rate, number of breaths and blood pressure are among the most common and common indicators in clinical diagnosis.

As early as more than ten years ago, the British doctor Albut had already made it clear that the scale was engraved on the small glass tube, and the lower end of the glass tube contained a modern thermometer that stored the small glass bubble of who won, although it was slightly heavy in terms of the manufacturing process of this era, but John did not have much room for improvement. As for the counting of pulse rate and number of breaths, it is enough to have a pocket watch.

There was only a blood pressure monitor, and John couldn't help but roll his eyes after seeing the real thing.

The prototype of the sphygmomanometer appeared more than a hundred years ago, a priest inserted a needle into the carotid artery of a horse, and then the blood rushed into a glass tube hundreds of centimeters long, and the horse's carotid artery blood pressure was measured. And the height of the blood column will increase or decrease with the horse's heartbeat, which is the original concept of systolic and diastolic blood pressure. In the following 100 years, although some people have made blood pressure monitors that can be carried around, they are also annoying and unstable in their bulkiness.

As a physician, John came to this age to accept no MRI, no sound, no biochemical routines, not even X-rays, but a blood pressure monitor that was not too complex could not be accepted. So, on the one hand, in order to "know" the tools to be used in the future, and on the other hand, in order to kill the boredom, John himself spent nearly a month finally building an "advanced" thing that could be used by doctors for a hundred years.

After looking at the "finished product" on the table for a while, John went to wash his hands contentedly, brushed his teeth, and lay down on the bed to get ready for bed. However, after lying in bed, John did not feel sleepy for a while, and how to dispose of this blood pressure monitor became something he had to think about immediately.

There is no doubt that patents must be filed.

At this time, the German patent system is relatively perfect, and it is enough to apply for it nearby. But the next promotion, manufacturing, and sales were a bit difficult for John. On the one hand, although this kind of sphygmomanometer is simple in structure, easy to carry, and not particularly difficult to use, it is very easy to produce errors if the specific operation is inexperienced, and John must prepare relevant theories; On the other hand, it is also a question of who will produce the sphygmomanometer. It is conceivable that this thing, like a thermometer and stethoscope, is probably a must-have for any doctor, and the key is that in the future, with the increase in medical students, there will be a large number of new customers every year, which must be something to make money.

The American side can naturally give it to Joshua, but what about the European side?

There was no doubt that Johann would give priority to manufacturing in Germany, but he was a little hesitant about whether to transfer the patents to others or set up his own factory.

The benefits of transferring to others are self-evident, you can get a large amount of money at one time, and you don't have to think about it, but the disadvantage is that the benefits cannot be maximized. After all, the production cost of this simple sphygmomanometer is not high, and the process is not complicated, so the relative investment is relatively low, with his current net worth is enough to deal with it, and considering that he will definitely get involved in the medical device and pharmaceutical industry in the future, it seems to be a good choice to practice with it now.

"Alas, I hate trouble the most."

Thinking about it, John's sleepiness slowly came up, he turned over, and after muttering a few words in a low voice, he made up his mind, no matter what, this matter must be determined as soon as possible, and if it really can't be done, it is better to ask Peake and Luther to help......

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