When the nurse draws blood with the butterfly, they wait until they see a flash of blood until that time they insert the vacuum tube. My question is, why will blood flow in the hypodermic before the tube is inserted? The needle is too tapered so how is blood guided to it? Also, in vautainer needles, is there also a place where on earth the flash can be seen before the tube is inserted? If not, how do they know they hit a artery

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Answers:    Capillary action. Surface tension of the blood against the inside the hypodermic helps it to be drawn into the needle. There is also a hypodermic covered by a latex seal that punctures the Vacutainer. I think this is what you tight by the Vacutainer needle. The blood doesn't travel down that far until the Vacutainer is inserted, which pulls the blood into the Vacutainer tube by negative pressure.

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The butterfly cannula it is exceptionally thin cannula with tow wing es on both sides it is above all use in newborn and infant . see the blood to know in or out of the scalp capillary .the blood pass to the needle because plunger act as vacuum the blood pass from nouns of high pressure to negative pressure and the maneuver obligation experience. negative pressure.

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