The diameter of a nude mouse's tail artery is usually ‌0.2~0.3 millimeters‌, and the diameter of the human finger's intrinsic artery is about 0.2 millimeters.

Because the diameters of the arteries are similar, the suturing of the nude mouse's tail artery is the best vascular suturing material for microsurgical finger replantation.

Suturing the vessels well so that the amputated finger survives is the most basic requirement for performing finger replantation surgery.

The theoretical premise of finger replantation surgery is that skilled hands in microsurgery are needed to ensure vascular suturing, allowing the finger to survive!

"Teacher Xie, isn't this unnecessary?"

Xie Yuan'an stood up, signaled Lu Cheng to follow her, and said, "If you want to brag to me about this, then it's very necessary!~"

"You must come with me now."

"Today, either you understand it clearly, or I do," Xie Yuan'an said, somewhat haughty and imperious.

Lu Cheng: "..."

What is this about, it's just a suturing skill, but we're talking about understanding death clearly.

Of course, Lu Cheng didn't back down either.

The training class is not like the large university lectures or middle school high school classrooms; in this training class, the more outstanding your abilities, the more likely you are to gain the teacher's favor.

The professors here, besides providing you with some surprise teachings, ensure lifetime benefits.

Professor Tong Yuan'an is certainly excellent, but he's still young. Among the professors teaching this time, apart from Xie Yuan'an, are big wigs whom even the giants in hand surgery at Xiangya Hospital must treat politely.

Their skills are the top-notch, most pioneering skills in Hua Country.

Lu Cheng indeed had nothing to do, and since he had checked out of his hotel, he had nowhere to go. So he followed Xie Yuan'an into the "Advanced Skills Practice Room" of the hand surgery training room at Union Hospital!

Upon entering, a characteristic smell of nude mouse 'urine' wafted through, but Xie Yuan'an wasn't bothered by the smell and headed straight towards the nude mouse iron cage.

"Lu Cheng, first change into your attire, wear sterile surgical gloves, I'll prepare for you…" said Xie Yuan'an.

Lu Cheng looked around, surveying the advanced practice room.

The practice room was brightly lit and spacious; in a sixty-square-meter empty room, there were only two operating tables.

The operating tables were eighty centimeters wide and three meters long, and movable.

On both sides of the tables, there were four movable microscopic objective lenses, a sign of substantial wealth.

On the wall-side storage rack, there were various green sterilization packets, presumably containing microsurgical tools.

There was also a shelving unit with various imported 'sutures', 'hemostatic materials', all packed tightly in each box.

Lu Cheng roughly estimated that if he stole these materials, they would amount to at least seven to eight hundred thousand…

Xie Yuan'an approached carrying the cage with the nude mice, pushed it toward Lu Cheng, and tilted her chin at him: "Go ahead…"

Lu Cheng said: "Can't we skip this, Teacher Xie?"

"No!~" Xie Yuan'an's tone was peremptory, entirely contrary to her earlier magnanimous 'matchmaker' demeanor; her eyes widened as if Lu Cheng, by not proceeding, would affect her mental tranquility.

Lu Cheng had to comply…

These practices, Lu Cheng had tried before; although at home practicing, the nude mouse was less professional, and the anesthetics had to be approved…

Once everything was ready, Lu Cheng began under the microscope.

Ideally, there should be an assistant for nude mouse tail artery suturing, but there are single-person training methods, requiring a tail clamp.

All these instruments were available.

And as Lu Cheng exposed the nude mouse's tail artery, Xie Yuan'an was fully equipped and seated opposite Lu Cheng, professionally acting as an assistant.

Lu Cheng used hemostatic clips to clamp both the proximal and distal ends of the nude mouse's tail artery and cut the two artery segments.

Lu Cheng then picked up a needle holder and imported sutures and began suturing.

Through the microscope, Xie Yuan'an saw the stability of Lu Cheng's needle holder under magnification; even when the operation curve was enlarged, it remained steady without a hint of shaking.

Xie Yuan'an looked up again, realizing Lu Cheng indeed seemed like a skilled hand surgery practitioner, with wide eyes, unblinking…

Xie Yuan'an's heart began to churn like blood boiling.

"Could it be? He's not bluffing? Then… isn't it Mu Nanshu who called him excellent?"

Lu Cheng's suturing speed was not slow!

The difficulty in vascular suturing lies in intricate skills rather than operation duration.

Twenty minutes later, Xie Yuan'an used very professional equipment from the practice room to measure the mouse's tail artery.

"Vessel Diameter: 214μm!"

"Instant Blood Flow Through Rate: 99.3%!"

"Blood Flow Speed: 0.22-0.26ml/min!"

"Re2200-2500!"

"Turbulent Volume Ratio: 12%…"

Xie Yuan'an's expression immediately turned aggrieved, her eyes somewhat swollen, and her voice carried a tearful note: "Why is it like this? How can it be like this?"

"Why can you do this?"

Xie Yuan'an's trio of inquiries left Lu Cheng befuddled, as if Lu Cheng couldn't even fathom the meaning of the measurements taken by Xie Yuan'an.

Oh, the vessel diameter and instantaneous blood flow rate, Lu Cheng could understand.

Lu Cheng pointed at the data, having already removed his gloves, and sincerely asked: "Teacher Xie, could you explain these figures?"

"I'm not a hand surgeon, so I can't quite grasp them."

Severe blow, critical hit, fatal strike, indecipherable, Kamehameha, all directly pounding on Xie Yuan'an's small brainpan, causing her whole being to buzz.

Xie Yuan'an's breathing intensified, yet she couldn't erupt in anger despite her fury.

Lu Cheng explained his reason, merely preparing for competitions, aiming to earn money as a professional —

"Rustle, humph!~" The airflow formed turbulence in Xie Yuan'an's petite nostrils, emitting rustling sounds after collision.

But the facts were settled, forcing Xie Yuan'an to hang her head:

"Blood flow speed isn't necessarily better faster or slower. Ideally, it's closer to the nude mouse tail artery's normal value."

"The theoretical measure for nude mouse tail arteries is 0.2-0.3mL/min (milliliters/minute). Yours being 0.22-0.26ml/min is fairly standard."

"After initial suturing, blood flow speed is subject to change."

"But the blood flow state has several types; laminar flow refers to the state where predictable flow velocity distribution parallel to vessel walls occurs. This flow pattern is idealized and a good approximation in small vessels throughout the human circulatory system."

"Once a vessel ruptures, anastomosis creates stenosis, disrupting laminar flow and causing turbulence or vortices. This resembles river flow."

Xie Yuan'an elaborated using analogies to explain to the layperson Lu Cheng, although internally she was crying out about why she must accommodate his hand surgery layperson's sentiments!

Ahhhhhhh!~

"The Reynolds Number (Re) dimensionless parameter's computed value can predict turbulence; Re less than 2000 implies laminar flow, whereas values exceeding 2500 generally suggest turbulent flow."

"Keeping Re within the 2000-2500 range is commendable."

"Nevertheless, even though overall Re evaluation isn't turbulent nor vortex-like, post-damage locally, vortices and turbulence appear."

"Vortex flow refers to localized vortices or stagnant flow separated from central vessel flow lines. It frequently occurs distal to vascular bifurcations and narrow regions, often reversing main flow direction."

"The proportion of turbulence within the whole somewhat reflects your proficiency; commonly, high turbulence and vortex occurrence rates lead to thrombosis."

"The heart's propensity for thrombosis stems from turbulence and vortex flow, measurable by ultrasound…"

"The smaller the turbulence and vortex ratio, the better; the typical vessel's ratio is 1%-3%, nude mouse tail artery at 1%."

"However, post-recovery following initial suturing…"

Xie Yuan'an looked at Lu Cheng, like a proud balloon deflated: "It's very commendable, far better than me."

"You, learning this, truly."

"Only."

"For competitions?"

Lu Cheng nodded, refraining from reinforcing stressed Xie Yuan'an verbally, but his actions became the final straw that broke her.

Xie Yuan'an continued to fixate on her camera for evidence capture.

Lu Cheng noticed she was pouting, her mouth nearly askew.

ps: 1300 first subscriptions aren't a problem, the thirteenth chapter's added, totaling eighteen chapters. This book is a daily doctor narrative, hence more characters are introduced.

The author has drafts, not writing on the spot; these chapters underwent multiple revisions and considerations.

If first subscriptions reach higher, there's more additional content!

In short.