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Because the needle and the needle bar are in a parallel state, when the needle stabs into blood vessels, there will be an angle. The needle has a tendency to turn upward and easily puncture blood vessels under the influence of gravity. Putting a cotton ball in the bottom of the needle is to form a certain angle so that to avoid worrying about pricking blood
vessels.According to the survey,when the needle and blood vessel retains an 25°angle is the best condition for injection.So we need to adjust the angle between the bottom of the needle bar and the needle to 25°.
ChongQing province, China