How to make a puncture needle for bone marrow aspiration

Bone marrow aspiration is an invasive examination method, which is usually completed in two steps: puncture first and then aspiration. The currently used bone marrow puncture needle consists of a cylindrical needle, a needle base and a needle core. The needle core is a solid needle shaft, and the needle is an oblique plane, which is installed in the cylindrical needle. The beveled mouth surface is flush, and when puncturing, it can prevent debris such as bone chips from blocking the needle hole of the cylindrical needle. When the bone marrow fluid is aspirated, a syringe is usually used at present. After the bone marrow is successfully punctured, the needle core is pulled out, and then the injection head of the syringe is inserted into the conical hole of the needle base, and the piston in the syringe is pulled evenly. Aspirate bone marrow fluid, and the volume of marrow extraction is 0.1-0.2ml. The disadvantages are: first, the two-step operation is used, which delays the operation time and is inconvenient; second, during the process of pulling out the needle core and installing and inserting the syringe, the exposure operation increases the chance of bacterial infection; During the process of installing the syringe, the hand is easy to shake, causing the puncture needle to be deflected, which increases the pain for the patient, and in severe cases, the puncture needle is bent, which affects the extraction; in addition, the suction speed and suction volume are also difficult to control.

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