Before the traditional subcutaneous injection, the air in the syringe needs
to be discharged, but on the one hand, the amount of heparin sodium (authentic
low molecular weight heparin) is less, after the injection, there is still some
residual drug solution in the syringe, resulting in the drug quantity is
insufficient, unable to play a better anticoagulation effect; On the other hand,
the liquid discharged from the needle, once injected, will accidentally injure
the epidermal capillaries, resulting in the formation of ecchymosis.
With the progress of science and technology, most of the heparin sodium
(authentic low-molecular weight heparin) injected subcutaneously now USES
pre-pot injection, leaving 0.1ml of air in the syringe. Do not exhaust before
injection, can be down the needle, the air to the top, gently push injection,
after the injection of a small amount of air will be with the push injection
will remain in the needle in the handle of all the liquid into the skin, so that
all injection, to ensure the accurate dose.