Intravenous catheter insertion device and method of use

The invention claims balloon venosus insertion device and method. The insertion device refers and coaxial's balloon venosus and flexible safety wire inlet of the. When the acupuncture to with a vein, comprising for driving member on the insertion device to push the safety inlet is arranged in the vein. The safety inlet line to inward and balloon venosus safety thrusts of the vein. Toilet, a driving member to and retract to inward and safety inlet, a water baffle the balloon venosus of the vein. Afterward, balloon venosus and insertion device, and a vein liquid supply, medicine source and are connected.