Blood collecting instrument, blood collecting method and blood collector thereof

Abstract

The invention discloses a blood collector. The blood collector comprises a blood collecting connector, a blood drawing needle, an air exhausting needle and a blood discharging needle, wherein the blood drawing needle is arranged on a blood drawing connector of the blood collecting connector, a mounting hole is formed in a blood discharging air exhausting connector, and an air vent hole is formed in an air exhausting connector; the blood discharging needle penetrates through the air exhausting needle and communicates with a blood passing cavity; the inner diameter of the air exhausting needle is greater than the outer diameter of the blood discharging needle, thus a ventilation channel communicating with the air vent hole is formed, and adhering points are arranged at the opening of the ventilation channel. The air exhausting needle and the blood discharging needle are coaxially arranged, so that only one opening is formed when the air exhausting needle and the blood discharging needle are inserted into a blood collecting tube, meanwhile, in the transition stage from the blood discharging needle to the air exhausting needle, the extrusion distances for the periphery of the sealed opening of the blood collecting tube are balanced, therefore, the operation inconvenience is solved, the phenomenon that the syringe needle is inserted into the inner wall of the blood collecting tube is effectively prevented, moreover, the stressing condition generated when the sealed opening of the blood collecting tube is inserted is also improved, therefore, the pollution is effectively prevented, and the safety and reliability are obviously improved. The invention further provides a blood collecting instrument and a blood collecting method adopting the blood collector.

Description

technical field [0001] The present application relates to the technical field of medical devices, in particular to a blood collection device for collecting clean blood from a vein. The present application also relates to a blood collection instrument using the above-mentioned blood collection device for blood collection. [0002] In addition, the present application also relates to a blood collection method using the above-mentioned blood collection device to collect clean blood. Background technique [0003] In the existing blood collection process, one end of the blood collection needle is inserted into a human vein, and the other end is inserted into a blood collection tube preset with negative pressure. Due to the negative pressure of the blood collection tube, blood automatically flows into the blood collection tube. However, the blood collection tubes with preset negative pressure cannot accurately control the blood collection volume during blood collection. Risk of ...

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Problems solved by technology

However, in practice, the inventors found that the product adopting this technical solution has at least the following technical problems in use: 1). When the aforementioned product is inserted into a blood collection tube, the distance between the blood-ejecting needle and the air-absorbing needle is relatively large (3-3.5mm) , plus the diameter of the two needles themselves, the maximum lateral distance on the cross section will be larger. Therefore, when inserting the blood collection tube, special attention should be paid not to insert the needle into the inner wall of the blood collection tube, otherwise it will easily damage the blood collection tube. Pollution in the tube; 2). Due to the large distance between the blood evacuation needle and the suction needle (3-3.5mm) of the aforementioned products, and the needles are one in front of the other, when inserted into the blood collection tube, the force will have a sudden change, so that the operation Or it is easy to vibrate and cause deflection during the insertion operation, which may cause the needle to be inserted into the inner wall of the blood collection tube

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