The oval tip of a needle

At present, "blunt needle" puncture is mainly used for puncture of autologous arteriovenous fistula in hemodialysis. Because the structure of blunt needle is characterized by an oval tip, the edge of the needle does not have a cutting front, so it will not cut the tunnel in the process of needle entry. After the formation of a fixed subcutaneous tunnel in the internal fistula, the ordinary sharp needle should be changed to blunt needle puncture in time, which can prevent bleeding at the puncture point and prolong the service life of the internal fistula.

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