Blood collection needle
Advantages of butterfly needles for blood collection.
Taking blood samples from newborns and infants when the required volume of blood is greater than can be obtained with a lancet from the heel.
Safer collection of blood samples from resisting (pugnacious) patients.
When taking blood from the back of the hand, the risk of nerve damage when using butterfly needles is much less than when using conventional double-sided needles to take blood into vacuum tubes.
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In the case of "difficult" veins, the nurse (nurse) immediately sees blood at the beginning of the flexible butterfly needle catheter as soon as it enters the vein.
In practice, the use of devices for blood collection needle butterfly has a downside:
Needle in a needle-butterflies usually (but not always - as you order, there are needle butterfly/device for blood sampling with a diameter of 0.8 mm 21g and 22g 0.7 mm) smaller in diameter than conventional bilateral needle for blood sampling, which increases the possibility of damage to the red blood cells due to hemolysis or clumping of platelets.
When taking blood through butterfly needles with a catheter, the time spent by the needle in the vein is relatively longer, since blood flows relatively slower through the butterfly needle and its catheter ("tail").
Sometimes, with a small volume of the first of a series of test tubes, not enough blood enters the first tube, since the vacuum from the test tube is spent on filling the connecting tube-catheter of the blood sampling device. Some advise using an empty vacuum tube without filler to fill the dead space, which should then be disposed of.
When taking blood for a series of tests in numerous vacuum tubes, there is sometimes a need for repeated venipuncture, since there may not be enough blood for all samples in a thin vein (from where blood is usually taken with butterfly needles).
Some nurses talk about more frequent "running away" and "falling off" of veins when puncturing veins with butterflies. Which is also understandable - "good" veins are punctured with ordinary needles.
Butterfly needles for taking blood are more expensive than conventional double-sided needles.
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