Once needle is in muscle, how hard to I have to pull back on plunger to make sure....

[Nuzzi]

be carefull not to pull back too hard or you may be sucking in air from past the plunger seal which is not good and you do not want any actual bubbles in the syringe. pull back untill you see very small bubbles start to apear in the oil, once you release they should disappear. your good to go after that.

[Bonaparte]

be carefull not to pull back too hard or you may be sucking in air from past the plunger seal which is not good and you do not want any actual bubbles in the syringe. pull back untill you see very small bubbles start to apear in the oil, once you release they should disappear. your good to go after that.

You could inject the whole 3ml syringe filled with air IM and it wouldn't hurt you.

[ACE5HIGH]

What I always found interesting about this method is that, when we aspirate until we see little bubbles. Those bubbles are not being pulled from us or from the needle end. What is happening is that the vacuum created is exposing the solutions micro bubbles, this is why as soon as you release pressure they immediately disappear. If we were drawing bubbles into or syringe through the needle then thy wouldn't disappear back into the solution.

This suggests that we are simply creating a vacuum and that if we were in a vessel it would be enough of a vacuum to see some blood appear from through the needle. This also suggests that it may not be necessary to see bubbles appear as long as we are creating a vacuum enough so as not to draw any blood. On the other hand as said above Id rather be safe than sorry and personally will wait to see some bubbles.

[gixxerboy1]

What I always found interesting about this method is that, when we aspirate until we see little bubbles. Those bubbles are not being pulled from us or from the needle end. What is happening is that the vacuum created is exposing the solutions micro bubbles, this is why as soon as you release pressure they immediately disappear. If we were drawing bubbles into or syringe through the needle then thy wouldn't disappear back into the solution.

This suggests that we are simply creating a vacuum and that if we were in a vessel it would be enough of a vacuum to see some blood appear from through the needle. This also suggests that it may not be necessary to see bubbles appear as long as we are creating a vacuum enough so as not to draw any blood. On the other hand as said above Id rather be safe than sorry and personally will wait to see some bubbles.

yes the bubbles are actually a void.