Automatic safety infusion catheter needle

An automatic safety infusion catheter needle comprising:

• a trifurcate connector having a hollow main body, an upper section of the main body being defined as a first hollow connecting section, a lower section of the main body being defined as a second hollow connecting section, the first and second connecting sections being coaxially aligned with each other about a central axis of the main body, a free end of the second connecting section being inserted with a rubber cap, a third connecting section outward projecting from a section between the first and second connecting sections of the main body for connecting with an infusion catheter;
• an infusion soft needle including a needle holder formed with a fitting socket at bottom end for fitting with the first connecting section of the trifurcate connector, a soft needle body connecting with and upward extending from a top end of the needle holder;
• a steel needle device including a steel needle body and a protective sleeve, a base seat of a bottom end of the steel needle body being normally resiliently and slidably latched in an upper section of the protective sleeve, a spring being resiliently compressed between the steel needle body and the protective sleeve for normally downward pushing the steel needle body, a top section of the protective sleeve being snugly fitted with the second connecting section of the trifurcate connector, a needle holder upward projecting from the base seat of the steel needle body, a steel needle being coaxially inserted with the needle holer, the steel needle being passed through the top end of the protective sleeve and coaxially fitted in the soft needle, the needle holder being formed with guide hole for guiding a liquid medicine to smoothly flow out, whereby when the steel needle body is unlatched from the protective sleeve, the spring compressed between the steel needle body and the protective sleeve resiliently restores so that the steel needle body is automatically bounded and dropped into the protective sleeve and hidden therein.