Visible blood-back blood taking needle

Abstract

The invention relates to a visible blood-back blood taking needle which comprises a vein puncture needle, a cannula needle and a blood taking needle base. A blood stopping sleeve is arranged outside the cannula needle, the blood taking needle base comprises a puncture needle base, a cannula needle fixing base and a cannula needle connecting base, the vein puncture needle is installed and fixed at the front end of the puncture needle base, a hollow blood-back cavity is arranged at the rear end o the puncture needle base, the rear end of the puncture needle base and the rear end of the cannula needle connecting base are butted and sealed, the cannula needle fixing base is inserted in a cylinder at the front end of the cannula needle fixing base and connected with and fixed on the cannula needle connecting base, and a dewatering and air discharge cannula is arranged on the outer side of the cannula needle fixing base and communicated with the blood-back cavity. Since the volume of the visible blood-back cavity is small, the dewatering and air discharging cannula can discharge air out of the blood-back cavity in time to reduce air pressure in the blood-back cavity. The visible blood-back blood taking needle has the advantages of reasonable structure, simple blood taking operation, high efficiency, fast, clear and reliable blood back, convenient observation, and little residual blood in the blood-back cavity which is only 0.03ml.

Description

technical field [0001] The invention relates to a medical device, in particular to a blood collection needle with visible blood return. Background technique [0002] We know that blood collection and application are important medical activities, and blood collection needles and blood collection tubes are essential and important equipment. In the past, traditional syringes were commonly used to draw blood, and then transferred to blood collection tubes for inspection and other operations; in recent years, one-step direct blood collection with vacuum tubes has become a more advanced blood collection method. Vacuum tube one-step direct blood collection adopts blood collection equipment such as double-ended blood collection needle, vacuum blood collection tube, blood collection sheath (needle holder). Existing double-ended blood collection needle is common blood collection needle, mainly comprises blood collection needle connecting seat and venipuncture needle and cannula needl...

AI Technical Summary

Problems solved by technology

However, due to the existence of gas in the puncture needle tube, it can be seen that the blood return reaction time is slow. In order to reduce the pressure in the blood return chamber, the required blood return chamber is relatively large, and the residual blood volume reaches 0.3ml, which easily leads to blood sampling errors.

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