Where did the meat in the needle go when the needle was injected?

From childhood to adulthood, we have been stuck with needles a lot.

Image source: Soogif

Wrong, try again.

This is the injection needle.

Image source: wikipedia

Whether it’s the butt needle when I was a child, the blood needle during the physical examination, or the current vaccine needle, too many needles will ask questions about the soul:

Prick me with a needle, will there be a tube of meat left in the core of the needle? Where did all that meat go?

The classmates of Boss Dong’s research group on dishonest fish drying farms have done a dishonest study on this soul problem. The following is the full text of the study:

【Objective】To explore where the meat in the needle core went when the needle was injected.

【Method】Evaluate the meat-carrying ability of different types of needles, and verify from both in vivo and in vitro.

【Result】Secret! See below for details.

【Conclusion】The needle does not poke!

Research Methods



Selected “white fat, shiny muscles, uniform red, fat and thin, slightly moist appearance, the depression of the lean meat can be restored immediately with fingers, and the elasticity is good” 200 g Purchased through Meituan Takeaway.

Discard an unused rubber stopper.

Use a marker to draw the area (5*3*3) on the pork surface as shown in the picture.

in vitro/in vitro

Use different types of needles (50ml, 20ml, 5ml, 2ml, 1ml) to tie the rubber stopper at three angles (30°, 60°, 90°), and the depth of each insertion is 1cm.

in vivo

Use different types of needles (50ml, 20ml, 5ml, 2ml, 1ml) to tie the pork belly at three angles (30°, 60°, 90°), and the depth of each insertion is 1cm.

image processing

Videos and pictures are all shot by HONOR 20 (CHINA). Processed into GIF format by EZGIF.

Study Results


In vitro tests show that the rubber can be closed immediately after being pierced, and there is no residue in the needle core.

No matter what kind of needle or angle is used to tie the rubber, we can see that the rubber is first scratched by the needle tip, and then the rubber is stretched by the needle tube. , the stretched rubber can be closed immediately!

Using the thickest 50ml syringe needle to tie the rubber, after pulling out the back needle, we carefully check whether there is rubber in the needle eye, it is obvious that the needle core is unobstructed!

In vivo tests show that the needle is thick enough to carry meat! !

As the animation shows, several different types of needles were inserted into the pork at three angles, with significant resistance (probably because the skin was too thick!). After pulling out the needle, I checked the eye of the needle, and the result was amazing!

50ml, 20ml needle, we can clearly see the pork tissue in it!

And 5ml, 2ml, 1ml needles are clean inside!

Furthermore, as soon as the needle is withdrawn, the pork shrinks to close the eye of the needle, and no cotton balls are needed to stop the bleeding! After a heated discussion as to why it didn’t bleed after being pricked with a needle, we agreed that it should be related to the fact that this piece of pork belly is not a live pig!

Great discussion


“Where did the meat in the needle go when the needle was injected?” It seems like a sand sculpture question, but it touches the blind spots of knowledge of many professionals! Therefore, it is necessary to study this issue to guide us to increase more sand sculpture knowledge and enrich our knowledge!

Here we first conducted similar in vitro experiments to simulate biological tissue with rubber to judge its effect. On rubber we got the exact “no rubber tissue in the needle core” answer, so we have evidence for in vivo testing.

However, it is clear that this must not pass the ethical review, so we replace the human body with pork belly accordingly!

The result of the pork belly acupuncture, we are also very surprised, unexpectedly, we got two answers! After the 50ml and 20ml needles are injected at a vertical angle, the pork tissue brought out can be clearly seen!

The “meat” of the injection is actually in the needle core! Excited! It’s like discovering a new continent!

Good luck! The nurse sister said that she would never pierce us with such a thick needle, that’s all right!

However, after piercing the pork at different angles with a 5ml needle, a 2ml needle and a 1ml needle, the pork tissue was not brought out.

Of course, we don’t know whether this real pig shooter can carry meat, and we don’t dare to ask!

We conduct a theoretical analysis of this conclusion. The skin is divided into two layers, the epidermis and the dermis. The epidermis is on the surface of the skin and can be divided into two parts: the stratum corneum and the germinal layer. The epidermis is a stratified squamous epithelium, and the dermis is a dense connective tissue with many elastic fibers and collagen fibers, so it has elasticity and toughness. The dermis is thicker than the epidermis and is rich in blood vessels and nerves. There is subcutaneous tissue under the skin, which is a loose connective tissue with a large number of fat cells.

The structure of muscle is: muscle fascicle muscle fibers (muscle cells) myofibril sarcomere (actin, myosin), muscle is denser than skin .

Image source: DK Find Out!

The needle of the medical syringe is designed with a beveled structure, and according to different therapeutic purposes, it can be divided into intramuscular injection, subcutaneous injection, intradermal injection and intravenous injection.

Image source: Dr. Lilac Design Team

When injecting, pierce the skin with the bevel facing up. When cutting the skin, it is the sharp needle tip that cuts the skin, which will only open a seam. As the needle goes deeper, the seam will tear and increase; if the needle tip penetrates into the muscle, the needle can be beveled to ensure that the muscle fibers are cut from one side. Broken instead of both sides, so there is no “meat” in the inside of the needle.

Only if the needle is very thick, it is possible that the two sides are broken, leaving a little tissue in the core of the needle. This is so painful and scary! (Of course, students who are not afraid of pain and courageous can also ask the nurse to choose a thicker needle, so that the injection is quicker and saves time!)

Study Conclusions


In conclusion, according to our scientific and rigorous tests, we have revealed that during the injection process, after the thin needle is pulled out, there will be no “meat” in the needle core, so don’t worry The flesh of the injection is gone, but it still grows there, no increase or decrease.

Don’t worry! There is another situation. Sometimes, the doctor just wants some meat from you!

Fine needle aspiration, coarse needle aspiration, bone puncture, and renal puncture, all of which will bring out human tissue in the needle core. This is not an ordinary “injection”.

Fine needle aspiration is to use ordinary syringes and ordinary injection needles to puncture breast lumps, thyroid glands, etc., and use negative pressure to absorb cells in the lump for biopsy. For coarse needle puncture, bone puncture, and renal puncture, the needles used are not ordinary injection needles, but needles with grooved structures, which are also used to take out the tissues in the corresponding parts.

Nursing Specialist’s Supplement

Thank you for your bold experiments.

The classmates at least got one thing right: needles that are so thick are not used for injections now.

Needles are an important tool in the injection process. We do not describe the needle in terms of the volume of the syringe after the needle, and we will not say “1ml needle”, but have a set of professional names and color specifications.

Image source: Internet

Subcutaneous and intradermal injections commonly used in adults generally use needles with international specifications above 26G (outer diameter not exceeding 0.45mm). Under no special circumstances (such as blood transfusion, surgery, etc.), intravenous injection will not use needles below 22G (that is, the outer diameter of the needle exceeds 0.7mm). Intramuscular injections occasionally use wider needles for medical reasons.

The needles that fit the 20ml and 50ml syringes with pork tissue left in the text are generally only used to prepare liquid medicine bottles. It really won’t poke you.

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