Novel magnetic conducting wire with variable-stiffness end and preparation method of novel magnetic conducting wire

By introducing a variable stiffness spring coil structure into the magnetically controlled guidewire, the problems of uneven guidewire stiffness transition and unstable connection are solved, improving the guidewire's passage through tortuous blood vessels and surgical safety.

CN122272979APending Publication Date: 2026-06-26UNIV OF SCI & TECH OF CHINA
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Patent Information

Application Number
CN202610614162.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-07
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing magnetically controlled guidewires have an uneven stiffness transition in tortuous and complex blood vessels, and the magnetically controlled tip is prone to slippage and puncture by the core wire, affecting surgical safety and service life.

Method used

A variable stiffness spring coil is installed between the guidewire body and the magnetically controlled end. The connection stability is enhanced by the gradual stiffness design of the unstretched section, the transition section and the stretched section. It is fixed with medical adhesive to form a strong interlocking structure.

Benefits of technology

It achieves a smooth transition in stiffness, improves the passage of the guidewire in tortuous blood vessels, avoids the magnetically controlled tip from slipping and being punctured, and ensures surgical safety and service life.

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Abstract

The invention discloses a novel magnetic conducting wire with a variable-stiffness end and a preparation method thereof, and belongs to the technical field of medical instruments. The magnetic conducting wire comprises a conducting wire body, a magnetic control end and a spring ring, the conducting wire body comprises a core wire and an outer layer, one end of the core wire is connected with the spring ring, the end, away from the core wire, of the spring ring is connected with the magnetic control end, and the core wire and the spring ring are jointly embedded into the magnetic control end; the spring ring is a whole continuous spring and is in rigidity gradual change distribution of an unstretched section, a transition section and a stretched section in the axial direction. The preparation method comprises the steps of preprocessing the guide wire main body, processing and fixing the spring ring, and forming and post-processing the magnetic control end. The problems that a conventional magnetic guide wire is not smooth in rigidity transition, a magnetic control end is prone to slipping off and the magnetic control end is prone to being punctured by a core wire are solved, natural and smooth rigidity transition is achieved, the blood vessel passing ability and connection stability are improved, the preparation process is simple, biocompatibility is good, and the magnetic guide wire is suitable for the vascular interventional operation.
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