Aspirating does not suck air from your muscle.

[MiltonBob]

OK I know I am new but have heard a lot of people say that you should see an air bubble come into the syringe when you aspirate and that this is ok as the air has come from your muscle.

This is not correct, the oil will have some air in it that you cannot remove. When you aspirate the reduction in pressure inside the syringe causes this air to expand making it seem as though you are sucking air out of your body. If the syringe is in the right place when you pull back on the plunger it should get blocked in the same way as if you put your finger over the end it would block it.

If you don't believe me get one of your used pins, take the needle off the end. Fill it with a couple of cc's of vegetable oil, get all the air out like you would then put your finger on the end and pull back as if you were aspirating, you will see lots of air due to the reduction in pressure but no air is actually entering the syringe as when you release the plunger it disappears. That is what you should see if you are aspirating in the right place.

[Gra]

When using your finnger on the tip, it could be air from your finger though?

[MiltonBob]

well use your mouth to suck all the air out of your finger first.

[Gra]

Good idea. lol. I think it`s fun though how anyone think you suck air out of the muscle..

[xxbiggdaddyxx]

i agree i'll prob bump this i see this question alot good way to put it milton

[lexruger]

whats the point? tryin to prove someone wrong? Not bashing just wondrin

[c-Z]

whats the point? tryin to prove someone wrong? Not bashing just wondrin

wondering the same thing??? I know exactly what he is saying and it is true. Its due to the pressure. But try explaining that to someone new.... Someone who has no idea of what aspirating is. And let me know how it goes...

And to be quit honest I have never heard anyone say the air bubbles are coming from the muscle. It is always pull back on the plunger slightly if you see bubbles your good to go. if you get blood. no good.

[MiltonBob]

No not trying to prove anything or anyone is wrong.

This is an awesome forum with so many helpful people with so much knowledge and I have learned heaps from lots of you. It was something I have seen in quite a few threads and I knew it was wrong so instead of not having any input why not say what is actually happening, it is just about letting others know like people have told me stuff. I know it does not matter and is pretty irrelevant but I personally want to understand as much about this as I can before putting this stuff into my leg with a big needle.

It is just better to know what is going on rather than thinking something is happening when it actually is not. If you understand why stuff is happening rather than just doing it makes it less worrying. For me it does anyway.

[biggerguns]

As long as theres no blood. Thats all that matters.

[smiler]

No not trying to prove anything or anyone is wrong.

This is an awesome forum with so many helpful people with so much knowledge and I have learned heaps from lots of you. It was something I have seen in quite a few threads and I knew it was wrong so instead of not having any input why not say what is actually happening, it is just about letting others know like people have told me stuff. I know it does not matter and is pretty irrelevant but I personally want to understand as much about this as I can before putting this stuff into my leg with a big needle.

It is just better to know what is going on rather than thinking something is happening when it actually is not. If you understand why stuff is happening rather than just doing it makes it less worrying. For me it does anyway.

good for you! any knowledge on this board that helps even a few guys is great. i say keep it up. pass along knowledge. those of you that whine cuz you already knew that...or whats the point.. or whatever go read something that helps you. why complain about a bro writing about something he thinks is relivant? what is YOUR point in complaining?

[kaboom]

Yea man I'm a newb and just learned something new.

[c-Z]

If you look very closely at the syringe often you will see very very small bubbles... And pulling on the plunger they get larger... AKA releasing the pressure. Not sucking air into the syringe.

Now blood on the other hand you will know when you do that. And that your sucking in.

[JimInAK]

The reason for the air bubbles are scientifically explained through the "Ideal Gas Law".

The bottom line is this... Liquids do not change their volume when compressed or decompressed, while gasses such as nitrogen do dramatically. The air that we breathe consists of roughly 80% nitrogen.

A tiny amount of air anywhere in the syringe or needle expands dramatically as the atmospheric pressure of 14.7 psi is decreased by the retraction of the plunger of the syringe. When you release the negative pressure on the plunger, the bubbles should disappear.

If the bubbles don't disappear, then you have a leak... but that is highly unlikely.

[JinNtonic]

As long as theres no blood. Thats all that matters.

yup...

[fastman9]

JimInAK’s scientific explanation is correct and as others have said you only really need to be concerned about withdrawing a lot of blood, a little is ok, as the issue is you’ve hit a vein and you pushing your product into that.