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Conductive filament of titanium molybdenum alloy

A titanium-molybdenum alloy, guide wire technology, applied in catheters, guide wires, medical science and other directions, can solve the problem of difficult to reach the vascular system of patients

Inactive Publication Date: 2009-02-04
MINNESOTA MEDICAL DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Shape memory makes it difficult for the surgeon to use his fingers to shape the tip of the guidewire to reach parts of the patient's vasculature

Method used

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  • Conductive filament of titanium molybdenum alloy
  • Conductive filament of titanium molybdenum alloy

Examples

Experimental program
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Effect test

Embodiment Construction

[0030] A large number of medical procedures require the use of guide wires within the patient's passageway. Many of these procedures involve the use of a guide as a guidewire within the patient's vasculature to insert a catheter or other device. Guide wires have been manufactured from stainless steel, which is somewhat rigid but does not bend easily within the patient's canal. Nickel-titanium alloy is also often used to make guide wires. Its softness and elasticity are better than stainless steel, and it also has a better memory, but its rigidity is not enough, so its propulsion is not as good as stainless steel. In addition, nitinol does not bend easily, so its distal tip is not easy to shape.

[0031] The guide wire shown in Figure 1 is made of titanium-molybdenum alloy, and its performance is between stainless steel and nickel-titanium alloy. Compared to guidewires made of other materials, titanium molybdenum alloys are easier to use, with better torsion, flexibility and ...

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Abstract

A guidewire for medical use such as in vascular and nonvascular systems. The guidewire made from a titanium molybdenum alloy wire with a composition of approximately 78% titanium 11.5% molybdenum 6% zirconium and 4.5% tin by weight such that it is softer than stainless steel guidewires and stiffer than NiTi alloy guidewires. The distal end of the guidewire is of a smaller diameter and softer than the proximal end and fitted with a coil for springiness such that the distal end will bend when encountering curves in the body passageways. The distal tip may be heat treated for a gradient of softness with the distal tip being the softest. The distal end may also be tapered to provide an additional gradient of softness. A distal tip on the distal end of the guidewire protects the wall of the passageway from being punctured as the guidewire travels through the passageway. The resulting guidewire has properties between those of stainless steel guidewires and NiTi alloy guidewires for better torsion and stiffness characteristics.

Description

technical field [0001] The present invention relates to the field of medical devices and in particular to guidewires mainly used in intravascular procedures. Guidewires made of titanium molybdenum alloy have soft and formable tips with low kink, high torque, good tracking and high longitudinal strength. Background of the invention [0002] The main requirement for guidewires and other guides, whether they are solid guidewires or tubular members, is that they have sufficient longitudinal strength so that they can pass through the patient's passageway (such as the patient's vasculature) without kinking (kinking). ) or binding (binding) is the least likely. However, the distal segment of the guidewire must be sufficiently flexible to prevent it from damaging the blood vessel or other lumen as it is advanced. Much research has been done to improve the strength and flexibility of guidewires to make them more suitable for their intended use, but strength for advancement is the e...

Claims

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Application Information

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IPC IPC(8): A61B5/00A61M25/00
CPCA61M2025/09083A61L31/10A61M2025/09133A61M25/09A61L31/022
Inventor S·努斯
Owner MINNESOTA MEDICAL DEV
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