Material selection of double lumen oocyte retrieval needle

The material is SUS stainless steel, and the cavity is long. In order to improve the strength of the cavity, we try to choose the thickest stainless steel material as much as possible under the premise of meeting the 18457 standard, but it should be noted that. The straightness of the needle tube is also very important, which directly affects the targeting accuracy. The inner and outer tolerance of the cavity is recommended to be +/-0.02MM.

The puncture force and steel toughness of the double-lumen oocyte retrieval needle require data quantification: since the double-lumen needle is a double-layer structure, there is not only a data dispute between the designers in terms of rigidity and toughness, but also a great controversy in the aspect of puncture force. The national standard GB18458 standard is used to calculate the puncture force. Based on the puncture of a single-layer tube, the design is designed to minimize the angle of the double-layer tube. The combined puncture force basically meets the requirements of the operation. The same is true: the same is true for steel toughness, ensuring that the rigidity and toughness of the single cavity meet the

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