A kind of heterogeneous medical stainless steel minimally invasive tube and its preparation method and mold

Abstract

The invention belongs to the field of materials, and particularly relates to an isomerous medical stainless steel minimally-invasive tube and a preparation method and a mold thereof. The minimally-invasive tube is made of stainless steel capable of generating strain-induced martensite phase change and divided into an operating section and a force bearing section, an austenite structure is serves as the operating section, and a martensitic structure serves as the force bearing section. In the preparation method, a pulsed hydraulic forming technology is adopted, the purpose of improving the strength and the hardness of the force bearing section of the stainless steel minimally-invasive tube through the martensitic structure is achieved by repeatedly conducting hydraulic bulging on the forcebearing section of the tube to induce martensitic phase change, and meanwhile the austenite structure of the operating section of the tube is retained to provide the good toughness. The preparation method comprises the following steps of molding installing, the bulging process, the back-bulging process, the repeated bulging process and the back-bulging process. According to the isomerous medical stainless steel minimally-invasive tube and the preparation method and the mold thereof, the minimally-invasive tube is prepared by adopting a pulsed hydraulic repeated bulging method, other materialsand elements are not introduced, no negative effect is generated on the corrosion resistance and the antibacterial property while the strength of the minimally-invasive tube is improved, and a preparation device is simple in structure and good in effect.

Description

technical field [0001] The invention belongs to the field of materials, in particular to a heterogeneous medical stainless steel minimally invasive tube, a preparation method and a mold thereof. Background technique [0002] Endoscopic minimally invasive surgery is a new type of medical treatment that has developed rapidly since the 21st century. Compared with traditional surgery, it has smaller wound area and less blood loss; clear imaging makes it easier to accurately diagnose the disease; fine operation is easy to reduce unnecessary infection And interference; fast postoperative recovery and other advantages. The specific operation of this operation is to open a small opening on the surface of the human body, and then insert a minimally invasive tube with an endoscope into the human tissue. After reaching the designated position, the internal organs are diagnosed and analyzed through computer imaging, and finally the minimally invasive surgical instruments are used Perfo...

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Problems solved by technology

[0003] After searching the literature of the prior art, it was found that Xu Lin et al. published the article "Research and Development of Medical 316L Stainless Steel Surface Modification" on "Vacuum & Cryogenics", Volume 20, Issue 1, February 2014. The strengthening process of the tube mainly includes: using mechanical grinding to nano-treat the surface of stainless steel to improve its strength, but the production process is complicated; using ion implantation technology to ionize the required elements into the surface of the substrate to improve the strength, but the implanted layer is relatively thin , poor plating performance and high equipment cost; using coating technology to coat a hardened layer on the surface of stainless steel to improve its strength, but it will reduce its corrosion resistance and high production cost

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