PURPOSE: A needle of an injector is provided to reduce pain and fear of patients by using a needle of smaller diameter, and to form a facilitate fluid path, thereby improving transfer efficiency of body fluid, and infusion solution delivery.;CONSTITUTION: A needle of an injector comprises an insertion part inside skin(12), and a location part outside skin(11). The insertion part inside skin consists of a body of length able to be inserted into skin or blood vessels. Inside the body, a fluid channel is formed. A vent port along fluid channel is continued. The diameter of the body in the insertion part inside skin is extended or reduced. The location part outside skin is connected to the rear part of the insertion part inside the skin. The insertion part outside skin forms one flow channel connecting to the fluid channel.;COPYRIGHT KIPO 2012
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