Precise arterial blood sampling device

A precise arterial blood sampling device, comprising a pen cap and a pen container which are movably connected, in which the pen container comprises a front pen container and a rear pen container which are movably connected, wherein:

• a first piezoelectric sensor sensing column is horizontally fixed to a lower end of an interior of the front pen container, a horizontal slide rail is provided on an upper part of the interior of the front pen container, a second piezoelectric sensor sensing column is provided on the horizontal slide rail, splines are provided on an upper end of the second piezoelectric sensor sensing column, an elongated groove is formed on an external top wall of the front pen container, and a sensing column extending/retracting control wheel fitting with the splines of the second piezoelectric sensing column is provided in the elongated groove, wherein the sensing column extending/retracting control wheel is configured to rotate to adjust a length of the second piezoelectric sensing column extending from the front pen container, such that the first piezoelectric sensing column and the second piezoelectric column are configurable to form a suitable blood sampling angle;
• and
• wherein a control chip, a needle ejection mechanism, a display screen, and a switch are provided inside the rear pen container, the needle ejection mechanism is fixed inside the rear pen container, the switch is connected to the control chip, and the first piezoelectric sensor sensing column, the second piezoelectric sensor sensing column and the display screen are connected to the control chip respectively.