What is the difference between a trocar and an indwelling needle?

Indwelling venous needle, also known as venous trocar, is through venipuncture, and the outer cannula and needle core are pierced into the blood vessel together. When the cannula is sent into the blood vessel, the needle core is pulled out, so that only the soft cannula remains in the blood vessel. Infusion is a method of infusion, so there is no difference between the two

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