Abstract: The intravenous catheter insertion apparatus has a catheter integral with a pre-slit injection site, a blunt cannula adapted for piercing the septum of the pre-slit injection site, and a tube slidably housing a needle. In a preferred embodiment, the needle tube and blunt cannula are integral with each other. In use, the needle is extended through the aligned bores of the catheter, injection site, and blunt cannula, leaving a portion of the needle tip projecting from the end of the catheter in order to insert the catheter into the patient's vein through venipuncture. The needle is withdrawn, the needle slide locking in the tube housing after use in order to prevent accidental needle puncture wounds. The blunt cannula is also removable, leaving the septum of the injection site sealed to prevent back flow or spurting of blood from the catheter. In an alternate embodiment, a T-connector having a pre-slit septum may be used in lieu of the of the injection site.