It's not that hard to open a hospital in another world, right?

Chapter 664 Magic blood pressure monitor?The number of people in the Mage Tower is really useful!

"Blood pressure monitor... blood pressure monitor... blood pressure monitor..."

Gretel frowned.

He is limited to "knowledge" in most of the magic, to be precise, in most of the magic that is not used in medical treatment.As for what the principle is, how to modify it, and how to change it, I don't know at all.

For example, he can change into hemostats, toothed forceps, toothless forceps, retractors and even obstetric forceps with a master's hand, and he can do it effortlessly, with precise changes and perfect force control;

However, other magic of the force field branch of the evocation system, such as how to increase the weight of the floating disc with the level of the mage, how to control the strength of the force field palm, to achieve a series of functions such as tripping, grasping, pushing, whipping, and even interfering with spellcasting... …

Sorry, no.

So now, wanting to make a magic blood pressure monitor, Gretel's first thought was to use a force field instead of the cuff and air bag for pressurization.But how to get sound from this stethoscope?
How can the magician in charge of monitoring pinpoint the timing of diastolic blood pressure when the sound accompanying the heartbeat suddenly weakens or disappears?Or go a step further, let the magic itself determine the time period and display the corresponding blood pressure value?
"what--"

Gretel shook his head.

He really doesn't understand!
He has a specialization in surgery, he is an emergency doctor, he is not a bigwig in the field of medical equipment.Whether it's a blood pressure monitor or a vital sign monitor, he can only use it, but he can't make it!
"Mr. Norwood—Oro—"

Two heads emerged from the laboratory separately.A magician of the transformation system and a magician of the evocation system surrounded Gretel, listening to him gesticulate:

"I want to build something like this..."

"Magic instead of a cuff? Instead of an airbag?"

Mr. Norwood immediately began to calculate.The magician of the transformation department, his daily job is to help everyone solve problems and turn the goals that other magicians have come up with into reality.

The various possible, impossible, and unimaginable demands put forward by customers, most other magicians will have to jump, and they have long been used to it.After thinking for a while, he spread out the manuscript paper and began to count:

How should the cuff be constructed?

How should the airbag be constructed?

Or simply use wind magic without force field constraints?

What is the range of pressurization and decompression, the sound of heartbeat, and the sound of blood flowing in the blood vessels, and which magic configuration should be spliced ​​into it...

Contrary to his actions, Aurora didn't think about the magic configuration immediately.This young evocation magician is still confused:

"Why build an airbag? Why do you need a cuff? Since it is to measure blood pressure, wouldn't it be good to measure blood vessel pressure directly?"

"This one……"

Gretel hesitated.To be honest, he is not a medical device major, let alone a medical device history direction, and has no idea of ​​"why the sphygmomanometer is made like this".When asked now, he can only deduce from the principle:

"Maybe...it's inconvenient to measure blood vessel pressure directly? After all, it may be inaccurate through the skin, muscles, and possibly layers of clothing..."

"So what's the point of the cuff?"

Gretel started from physiology, thought about it from the beginning, and slowly organized his thoughts:

"The cuff-type measurement method means that when the air pressure in the cuff is higher than the systolic pressure, the blood cannot pass through the blood vessels without any fluctuations, so no sound can be heard;"

"The air pressure of the cuff continues to decrease until it is lower than the systolic pressure. The blood is forced to pass through the blood vessel by the pressure of the heart contraction. The blood vessel is subjected to this pressure and mechanical vibration occurs. We can hear the sound of this mechanical vibration through the stethoscope; "

"The cuff air pressure continues to decrease, the resistance continues to decrease, the mechanical vibration weakens, and the mechanical vibration sound heard through the stethoscope gradually decreases;"

"Until the cuff pressure is lower than the diastolic pressure and the resistance to the blood vessel drops to 0, then there will be no mechanical vibration of the blood vessel, and no sound can be heard with the stethoscope."

He stopped explaining and looked around at the two people around him:

"So a mercury barometer is different from an invasive sphygmomanometer. What it measures is actually the air pressure of the cuff, rather than directly measuring blood vessel pressure—"

"what?"

"what?"

Norwood and Aurora spoke at the same time.Gretel did not pause, and continued to speak slowly:

"It's just that at a certain moment, when the cuff pressure is equal to the blood vessel pressure, certain things will happen. The measurer takes the value at this moment as the systolic/diastolic reading, that's all."

"So, the key is the speed of deflation?" Aurora thought slowly and said:
"Because the heart rate is about 1, [-], [-] or [-] beats per minute, so the deflation speed is too fast, and the air pressure will be all at once, and nothing will be measured..."

"Since this is the principle, then we can directly measure the pressure!" Master Norwood suddenly jumped up:

"We have similar things! For the steam engine and the pressure cooker they made before, they made a pressure gauge! Let's take that magic apart and change it to the related blood pressure magic!"

"Record its pressure waveform!" Gretel's eyes lit up:
"The highest and lowest pressure values! Changing the display mode to mmHg is exactly what we want!"

"Isn't it just a matter of precision and time? It's not difficult! I'll change it!" Master Norwood was gearing up and almost ran away.After thinking about it, he turned his head and asked:
"Boss, what else do you need?"

"Connect a light screen? Like an electrocardiogram? Then connect an output, such as something that can spit out a paper tape. I remember that when I was doing electrocardiogram magic, there was related research;" Gretel snapped his fingers:

"Better do both! I need both! The one that lasts the day is even better!"

"No problem, boss!" Master Norwood already had an idea, and agreed.Gretel turns to Aurora:
"Oro, you can do me a favor too. You two each make a version, Mr. Norwood, you make a physical version, whether it's engraved on the magic spar or on anything, in short, it's ready when it's activated. Usable;"

"Auruo, what you do with the magic version is to create a magic spell and hit it directly on the patient's arm. It's best to last for a while, and 1 hour per level is better."

"please!"

"No problem, boss!"

The two magicians answered at the same time.Then, turn around, run, check information, purchase corresponding spell configurations, and start modification experiments...

In less than a week, the magic sphygmomanometer that Gretel wanted was held in front of him.

"Boss, give it a try?"

Gretel took the belt from Magister Norwood and wrapped it around his upper arm.The chip is pressed against the center of the inner side of the upper arm, tightly wound in a circle, and the magic spar at the top is activated——

A curtain of light unfolded in front of everyone.

"155, 98—Master Norwood, your blood pressure is a bit high! Are you too tired during this time?"

****
This chapter is thanks to @书友20201027193620425131037 Teacher Shu for his technical guidance

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