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Titanium alloy for enclosed intrauterine device

A technology of intrauterine devices and titanium alloys, which is applied in female contraceptives, medical science, surgery, etc., can solve the problems of heavy stainless steel coil spring support and poor corrosion resistance of stainless steel, so as to reduce the effect of galvanic corrosion, Unleash the effect of stabilization

Active Publication Date: 2013-06-05
LIAONING AIMU MEDICAL SCI&TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 2. The weight of the stainless steel coil spring bracket is relatively large. According to different product specifications, the weight is 400mg ~ 600mg
[0007] 3. The corrosion resistance of stainless steel is unsatisfactory. Taking the commonly used 06Cr19Ni10 as an example, its pitting potential E b Usually 400mV ~ 600mV, 316 stainless steel with better corrosion resistance can only reach 800mV

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The titanium alloy coil spring is used to make a closed intrauterine device such as a uterine cavity shape (also including a yuan palace shape, a palace T shape) or an O shape.

[0044] Titanium alloy is Ti-Zr-Nb-Ta alloy, and its composition tolerance refers to JIS T 7401-4. In order to improve the mechanical properties, it is permissible to contain 0.10%-0.5% of oxygen (O) and 0.02%-0.2% of nitrogen (N) in total weight. The titanium alloy is a round wire of 0.35mm-0.40mm, or a special-shaped wire with the same cross-sectional area as the round wire.

Embodiment 2

[0046] The titanium alloy coil spring is used to make a closed intrauterine device such as a uterine cavity shape (also including a yuan palace shape, a palace T shape) or an O shape.

[0047] The titanium alloy is Ti-15Sn-4Nb-4Ta. In order to improve the mechanical properties, it is permissible to contain 0.10%-0.5% of oxygen (O) and 0.02%-0.2% of nitrogen (N) in total weight. The titanium alloy is a round wire of 0.35mm-0.40mm, or a special-shaped wire with the same cross-sectional area as the round wire.

[0048] In addition to the titanium alloys used for closed IUDs provided in the above two embodiments, the composition expressions of the titanium alloys according to the present invention can also be but not limited to the following types:

[0049] Titanium alloys are Ti-Nb alloys, such as:

[0050] Ti-15Nb, Ti-16Nb, Ti-21.6Nb, Ti-22Nb, Ti-24Nb, Ti-25Nb, Ti-26Nb, Ti-26.5Nb, Ti-29Nb, Ti-30Nb, Ti-35Nb.

[0051] Titanium alloys are Ti-Nb-Ta alloys, such as:

[0052] Ti-22N...

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Abstract

The invention relates to a titanium alloy for an enclosed intrauterine device. The titanium alloy has an expression formula of Ti-X or Ti-X-Y, wherein X is one or more of the following isomorphic beta stable elements: molybdenum, niobium, tantalum and tungsten; X accounts for 0.001-70 percent of the total weight; Y is one or more of the following neutral elements, namely, tin, zirconium and hafnium; and Y accounts for 0.001-30 percent of total weight. The titanium alloy disclosed by the invention can be prepared into a titanium alloy wire which is used for manufacturing a stent of the intrauterine device.

Description

technical field [0001] The invention relates to an intrauterine contraceptive device for women, in particular to a titanium alloy used for a closed intrauterine contraceptive device. Background technique [0002] The intrauterine contraceptive device (referred to as "the IUD") is a contraceptive device placed in the uterine cavity of a woman. [0003] The closed IUD is the most commonly used IUD in China. The bracket of the intrauterine device is a closed structure formed by the combination of stainless steel helical springs, and the stainless steel grades are 0Cr18Ni9 and 1Cr18Ni9Ti. [0004] Stainless steel coil spring brackets have the following problems: [0005] 1. Stainless steel contains a certain amount of toxic elements, such as 06Cr19Ni10 (called 0Cr18Ni9 before 2007), which contains 18wt% to 20wt% of Cr elements, 8wt% to 11wt% of Ni elements and about 2% of Mn elements. [0006] 2. The stainless steel helical spring bracket is heavy, depending on the product sp...

Claims

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Application Information

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IPC IPC(8): A61L31/02A61F6/14
Inventor 武小锋
Owner LIAONING AIMU MEDICAL SCI&TECH
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