Blood collecting instrument and method and blood collector thereof

Abstract

The invention discloses a blood collector which comprises a blood collecting joint, a blood sucking needle, an air sucking needle and a blood discharge needle. The blood sucking needle is arranged on a blood sucking connector of the blood collecting joint. An installation hole is formed in a blood discharge and air sucking connector. An air discharge hole is formed in an air discharge connector. The blood discharge needle penetrates through the air sucking needle to be communicated with a blood passing cavity. An air passing channel is formed between the air sucking needle and the blood discharge needle. A holding ring is arranged at the port of the air passing channel and provided with a ventilating notch so that the air passing channel can keep being communicated with the outside world. The air sucking needle and the blood discharge needle are coaxially arranged, so only an incision is formed when the blood collector is inserted in a blood collecting vessel; in the transition stage from the blood discharge needle to the air sucking needle, the squeezing distance on the periphery of a sealing opening of the blood collecting vessel is balanced. Operation convenience can be achieved, a needle is effectively prevented from being inserted into an inner wall of the blood collecting vessel, the stress conditions are improved when the blood collector is inserted in the sealing opening of the blood collecting vessel, contamination can be effectively avoided, and safety and reliability are remarkably improved. The invention further provides a blood collecting instrument and method using 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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