First of all, check the "clarity" of solution injection. In other words, it should be transparent without visible turbidity or foreign matter. There are also suspension injections, but they cannot be used for veins or spinal canal. After insoluble particles enter the human body, larger particles will block capillaries, form thrombus, invade lung, brain, kidney and other tissues, and cause embolism. If they are in the blood, they will be surrounded by immune cells. As cells multiply, they form particles, leading to various risks.

Fruit juice contains a variety of insoluble solids, such as cellulose, plant cell wall fragments, pectin and so on. This is "simple filtration", but obviously "household filtration equipment" such as gauze or ordinary filter paper cannot be used. The number of particles smaller than 25μm is less than 2 to 5.

Secondly, intravenous drugs are directly mixed with blood, but a transparent solution is not enough, so it should be basically similar to plasma. For example, it must be equal to or close to plasma osmotic pressure and equal to erythrocyte membrane tension. If the solution concentration is too high, blood cells or surrounding tissue cells will lose water (imagine bacon here). If it is too thin, it will swell until the cell breaks.

The commonly used isotonic injection is 0.9% sodium chloride solution or 5% glucose solution. When squeezing juice, it is impossible to accurately measure the concentration by adding a bowl of water or a bowl of water. In addition, the injection should be equal to the pH of blood (about 7.4), so as to avoid irritation and not affect the acid-base balance of human body too much.

Finally, it is particularly important to emphasize that injections must be sterile preparations. We know that microorganisms exist widely in the natural environment, and there are all kinds of living microorganisms in air, water and the surface of objects every day. In order not to be an intermediary, one of the functions of its external barrier is to resist the invasion of various microorganisms, so don't eat live microorganisms when you need to bypass the barrier to transport drugs into the body.