A training method and a training device for a nickel-titanium alloy element

By subjecting nickel-titanium alloy components to a cyclic phase transformation training of austenite → martensite → austenite, the problem of shape memory fatigue in nickel-titanium alloy stents during service was solved, the mechanical properties and dimensional stability of the stents were improved, the stimulation of the cavity walls was reduced, and the requirements of biomechanics were met.

CN122279439APending Publication Date: 2026-06-26SHANGHAI TITANIUM TECH CO LTD
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI TITANIUM TECH CO LTD
Filing Date
2024-12-26
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing nickel-titanium alloy stents suffer from shape memory fatigue during service, which leads to unstable changes in support force and diameter, increasing the risk of stent displacement. Furthermore, conventional processes are unable to effectively reduce the impact of shape memory fatigue.

Method used

By conducting cyclic phase transformation training of austenite → martensite → austenite on nickel-titanium alloy components, the service process of the stent in vitro is simulated using loads and strains higher than the service conditions until the target expansion and compression states are reached. The number of cyclic training cycles is 3 to 200, and the temperature is controlled between 25℃ to 160℃ and -150℃ to 20℃.

Benefits of technology

It improves the mechanical properties and dimensional stability of nickel-titanium alloy components, reduces the diameter reduction during long-term service, reduces irritation to the cavity walls, and meets biomechanical requirements.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN122279439A_ABST
    Figure CN122279439A_ABST
Patent Text Reader

Abstract

This invention provides a training method and apparatus for nickel-titanium alloy components, relating to the field of medical devices. The method includes: transferring the nickel-titanium alloy component to a first solution, causing it to expand under a first training stress; acquiring first morphological information of the expanded component, determining whether its expansion state has reached a target expansion state, and adjusting training parameters if the target has not been reached; when the expansion state reaches the target, removing the component and transferring it to a second solution, causing it to compress under the first training stress; acquiring second morphological information of the compressed component, determining whether its compression state has reached a target compression state, and adjusting training parameters if the target has not been reached; when the compression state reaches the target, re-transferring the component to the first solution, repeating the thermal expansion and cooling compression process until the training target is met. Using the nickel-titanium alloy component of this invention, not only are dimensional and performance stability improved during long-term service, but biomechanical requirements are also met.
Need to check novelty before this filing date? Find Prior Art