Hemodialysis consists of supplementing the deficient kidneys by “cleaning” (purifying) the blood several times a week using a machine.
How does hemodialysis work?
We know that the human body makes permanent waste. These are immediately recovered by the blood and transported to the kidney for elimination.
When the kidneys no longer work, they can no longer eliminate the waste produced by the body or the water we drink. Result: on the one hand, the body is intoxicated by waste and, on the other hand, the water we drink is retained in the form of edema, responsible for abnormal weight gain.
Hemodialysis removes both waste and water.
Hemodialysis: evacuation of waste and water
Hemodialysis will therefore eliminate waste from the body. The blood laden with waste passes into an apparatus; the waste is eliminated; the blood comes back “cleansed” in the body and can once again take up waste and dispose of it in the device. And so on. At the same time, the machine eliminates the water accumulated in edema. After a few hours, the body is sufficiently cleared of waste and accumulated water so that dialysis can be stopped. But, quickly, the body will again take care of waste. This is why you have to take several dialysis sessions a week.
Hemodialysis equipment includes:
– a blood circuit, with a pump that draws blood and returns it to the body once cleaned;
– a machine (a generator) that produces a sterile liquid, the composition of which is adapted to the human body; this liquid is called dialysate;
– between the two, a small essential cylinder called dialyzer.
Everything happens in this little cylinder
“If you sawed this little cylinder in half, just as you saw a log to see how it was made, and if you removed the walls to see it well, you’d end up with some sort of badger for the beard. With hairs of hollow badgers.
– During dialysis, the blood circulates in these hollow hairs. And the dialysis fluid circulates all around these hairs.
– The blood is separated from the dialysis fluid by the very thin wall of the hair.
– This extremely thin wall is a little porous. It allows molecules to pass in both directions: the waste passes from the blood to the dialysate and indispensable molecules pass from the dialysate to the blood.
– Thus: 1) before the dialyzer, the blood is loaded with waste while the dialysate is very “pure”; 2) after the dialyzer, the blood is stripped of its waste while the dialysate is, on the contrary, loaded with waste. The blood comes back into the body and the dialysate laden with waste is thrown away. As for water, simply program the hemodialysis machine so that it sucks gradually the amount of water to eliminate.