In the evening, just as Lin Jie was about to head home, he received a call from Lei Jun, saying that the water tank equipment was ready ahead of schedule.

Overjoyed, Lin Jie hurried to the comprehensive experimental building of the hospital and saw a large water tank three meters long, two meters wide, and two meters high in the orthopedic laboratory.

The interior was already filled with a light blue liquid.

Wearing an inflatable collar, with a tight-fitting suit on her upper body, and seemingly wrapped in a thin, dense foam on her lower body, Xue Linlin was floating and curiously walking back and forth in the water.

Lin Jie also noticed that a soft tube as thick as an index finger was attached to Xue Linlin's back, resembling a long, thin tail, connected to a pump-shaped device hanging outside the water tank.

"Expert Lin, let me introduce you."

Lei Jun pointed to a man in his thirties with glasses and a broad face beside him and said, "This is Engineer Yuan Xianjun, who was fully responsible for the design and supervision of the water tank."

Lin Jie politely said, "Engineer Yuan, thank you for your hard work. Please give us a detailed introduction to this set of equipment."

"Sure!"

Yuan Xianjun responded, turning his gaze to the water tank in front of him, and softly said, "Expert Lin, the liquid in the water tank is a mineral water solution beneficial to the human body, with added anti-inflammatory agents to prevent infection."

"I can guarantee that even if this water solution penetrates the waterproof layer on the patient's body and contacts the wound, it will not irritate the wound or cause the patient to feel pain or itchiness."

"Moreover, the density of this water solution needs to be meticulously calculated according to the patient's bodily conditions and the area and thickness of the waterproof layer sprayed on their body."

"The current density of the water solution in this tank is configured according to Xue Linlin's body measurements."

Lin Jie nodded slightly. From the introduction, it seemed that this person had a very meticulous working style.

He asked, "Since the patient needs to soak in this water solution for a long time, one concern is the water-proofing. How have you addressed this?"

Yuan Xianjun took a red can, resembling an insecticide spray, from a table nearby and introduced it: "Expert Lin, this is one of our patented products."

"When sprayed on the surface of an object, it can solidify into a dense foam waterproof layer within five seconds."

"This waterproof layer, with a thickness of five millimeters, can effectively waterproof for a month at a water depth of ten meters."

Lin Jie asked with concern: "Is it harmless to the human body? Does it cause any irritating reactions to the skin?"

Yuan Xianjun assured, "We use environmentally friendly materials that are absolutely non-toxic, harmless, and have no side effects."

"Moreover, besides quick solidification for waterproofing, it also has another advantage: the cured hardness is quite good."

"We've calculated that the foam waterproof layer, with a cured thickness of five millimeters, has hardness comparable to a 1.5-centimeter-thick gypsum board."

He recommended, "Expert Lin, our product can be completely used in field rescue and other emergency treatments to fix fractured bones and seal external body wounds for emergency hemostasis."

Lin Jie remarked, "According to your introduction, it indeed seems like a good product for first aid."

"I have one more question: Since it's waterproof, it must be impermeable."

"Our skin also needs to breathe. When the patient's body is wrapped in such a waterproof layer for twenty days, the impact on the skin is imaginable."

"How does Engineer Yuan address this issue?"

Yuan Xianjun gave a slight smile, wearing an expression that seemed to know this question would be raised, and took a long piece of gauze from the table, offering it over.

Lin Jie noticed that this gauze might be more aptly called a plastic screen.

Its mesh was large, woven with approximately two-millimeter diameter plastic threads, and felt quite soft to the touch.

Moreover, the center of this gauze was connected to two long plastic tubes with a diameter of five millimeters.

Yuan Xianjun explained: "Expert Lin, the plastic threads weaving this gauze are hollow and densely covered with small holes."

"We can wrap the patient's wound with the gauze first, then cover it with sterilized gauze outside, and finally spray the waterproof foam layer on the outside."

Pointing to the two long plastic tubes in the center of the gauze, Yuan Xianjun continued: "These two plastic tubes, one inlet and one outlet, can be connected to a pump to dehumidify and ventilate, or used to inject some disinfectant or topical pain-relieving drugs"

This introduction piqued Lin Jie's interest greatly.

It's important to know that in hot weather, bandaging many wounds is a big problem.

Even with breathable gauze, it's hard to prevent the skin near the wound from sweating, affecting wound recovery.

This gauze, which can dehumidify and ventilate close to the wound, would undoubtedly greatly enhance the comfort of wound recovery."

"Very good, also very practical," Lin Jie sincerely praised.

"Thank you for your recognition, Expert Lin."

Yuan Xianjun showed a very pleased expression and continued: "Expert Lin, let me introduce the bed inside the water tank to you."

Following the direction of his finger, Lin Jie saw a metal bed standing on the northern sidewall of the water tank.

"The bed is structured with a metal frame, woven with a high-elasticity adjustable rope, serving as support."

"By adjusting, patients can achieve sitting, reclining, walking, and inclined positions at any angle in the water tank."

"There's still one unresolved issue."

"To ensure the injured leg and hip remain submerged and supported by buoyancy, while the patient's head stays above the water, patients cannot lie flat while resting."

For this issue, combined with Yao Henan's situation, Lin Jie doesn't see it as a major problem.

Even lying on a flat bed, one still needs to use a pillow, right?

Lin Jie said softly, "The optimal sleeping posture issue should best be resolved."

"But not solving it immediately isn't a big concern; I'm sure the patient can overcome this slight discomfort."

He pointed to the pipe behind Xue Linlin's back, asking, "Is this the solution for the body's three urgent needs?"

Fang Huanru, who had been listening quietly nearby, spoke up, "Yes, teacher."

"Since patients need to stay in the water tank for a long time, wearing a catheter for so long is bad for the body."

"So we designed a device, a small, soft, rubber bedpan that fits the body's upright habits."

"After use, it can be sucked out through the pipe at any time, and then washed and dried with warm water."

Lin Jie circled the water tank twice and said, "Patients trapped in such a water tank are surely not feeling good. Remember to add a device that allows them to easily use a phone and computer without tiring their hands or straining their necks."

Yuan Xianjun nodded, "That's easy to handle; the device can be installed by tomorrow."

Lin Jie approached the water tank and asked Xue Linlin, who was floating inside, "How do you feel now?"

Xue Linlin giggled, moved her stiff legs slightly, and said, "Teacher, I'm feeling quite good, as if my whole body is being lifted by some invisible force, very relaxed."

Lin Jie's face suddenly darkened, "You're playing the part of a patient who just had major surgery on both legs and hips. Can she walk around in the tank like you?"

Xue Linlin stuck out her tongue in fear, quickly moved to the north side of the tank, and tied herself to the upright bed.

Lin Jie ordered further, "Connect all the necessary medical monitoring equipment to Xue Linlin."

"And activate all required equipment, such as water circulation and temperature control systems."

He looked at Xue Linlin again and decided, "Until Yao Henan's surgery starts, stay in the tank as much as possible to provide them with more experiential and test data."

Upon hearing this, Xue Linlin was dumbfounded.

She hurriedly said, "Teacher, teacher, Dr. Lei and Senior Sister Fang said I only need to try it out."

Lin Jie did not respond to her and turned to Yuan Xianjun, asking, "Tell me honestly now, is this water tank ready for formal use?"

Yuan Xianjun clearly did not expect Lin Jie to so abruptly propose testing.

He hesitated for a moment before solemnly saying, "Expert Lin, this water tank equipment is already conditionally ready for actual operation."

"I have confidence in my design and the construction of the tank."

Lin Jie nodded in agreement, "In that case, let Xue Linlin stay inside."

"Based on her feedback and identified issues, improve the tank equipment."

"Also, after final improvements are made, I need you to build a second water tank to be prepared for any contingencies."

Yuan Xianjun assured, "Expert Lin, your requirements will be fulfilled optimally and swiftly."

"Teacher…"

Hearing Xue Linlin's pleading voice, Lin Jie directed his attention back to her, reminding, "Xue Linlin, taking on a trial role means having the consciousness of being a trial subject."

"This is not child's play; you have to endure all good and bad aspects without choice."

Xue Linlin's features contorted, embarrassed, "Teacher, do I have to stay in the tank for days, doing everything here? Eating, drinking, relieving, and sleeping?"

"With so many people watching..."

Fang Huanru, smiling, advised, "Xue Linlin, you're still shy? As a doctor, all matters of the human body, no privacy is secret to us."

"I've worked for years; do you know how many strange cases I've seen?"

"I'll accompany you these days, and tell you about all those peculiar cases."

Xue Linlin's face showed distress as she looked at Lin Jie, "Teacher, I'll try to be a qualified test subject. But can you inform my parents?"

"I've never spent a night alone outside until now. My mom has always been strict with me."

This is indeed an issue.

Lin Jie said, "Alright, you can make a video call with your parents, explain the situation, and I'll talk to them as well..."

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