Huizhou Pengchengrui Technology Co., Ltd.

Nickel titanium alloy closed-loop structural components refer to parts made of nickel titanium alloy materials with closed rings or non connected mesh structures, which are widely used in fields such as biomedicine and aerospace. Here is a detailed introduction about it:

Structural characteristics: The mesh of the closed-loop structural component is composed of independent closed units, and the minimum diameter area of each mesh is not connected to other mesh areas, presenting an overall "steel mesh" structure. This structure results in high metal coverage and strong rigidity.

1、 Performance advantages

• Excellent mechanical properties: Nickel titanium alloy itself has unique shape memory effect and superelasticity. The closed-loop structure design also provides strong radial support and unidirectional pressure resistance. For example, Zhongtian Medical's iliac vein stent adopts a seamless woven structure with 12 nickel titanium platinum gold wires in a closed-loop, which can provide good support while conforming to the anatomical shape of blood vessels.

  
  

• Good biocompatibility: Nickel titanium alloy has an elastic modulus similar to that of human bones and good corrosion and wear resistance. It is not easy to cause immune reactions in the human body and is suitable as a medical implant component, such as vascular stents, orthopedic clasps, etc.

  
  

• Accurate positioning capability: Some nickel titanium alloy closed-loop structural components have special designs that facilitate precise positioning during use. For example, the unique "short horn mouth" design at the tip of the iliac vein stent better fits the position of the iliac vein opening, ensuring effective anchoring and precise release, and avoiding affecting contralateral blood flow.

Nickel titanium alloy closed-loop structural components

2、 Manufacturing process

• Laser cutting: By using a five axis linked laser cutting equipment combined with a closed-loop control system, high-precision machining can be achieved, with an accuracy of up to ± 5 μ m. Medtronic's Trevi thrombectomy stent is a tubular stent structure formed by laser cutting nickel titanium alloy tubes into a closed loop.

  
  

• Additive Manufacturing: By utilizing additive manufacturing technologies such as Selective Laser Melting (SLM), integrated near net forming of nickel titanium alloy closed-loop structural components can be achieved, which can effectively suppress harmful phase precipitation and enable the formed parts to achieve good superelasticity and shape memory effect.

3、 Application Fields

• Biomedical field: widely used in medical devices such as vascular stents and thrombectomy stents. For example, Xact (Abbott) in carotid stents adopts a nickel titanium alloy closed-loop structure with excellent radial support, and is commonly used for the treatment of carotid stenosis combined with calcified plaques. The Trevo in the thrombectomy stent, with its closed-loop tubular structure, can more effectively wrap the thrombus inside the stent, reducing the risk of thrombus escape.

  
  

• Aerospace field: Due to its excellent mechanical properties and fatigue resistance, it can be used to manufacture some key components in aircraft engines, such as sealing rings, connecting structural components, etc., which can maintain stable performance under complex working conditions.

Wuge Nickel Titanium Alloy Materials provides full industry chain product services for nickel titanium, from nickel titanium alloy smelting, forging and opening billets, rolling, wire drawing to finished products (nickel titanium fiber wire, seamless nickel titanium tube, nickel titanium alloy closed-loop structural components). Welcome everyone to communicate and exchange ideas.