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Method for making NiTi alloy ossicular fixator of easy taken-out type

A manufacturing method and fixer technology, applied in fixers, internal fixers, medical science, etc., can solve problems such as difficulty in removing NiTi alloy orthopedic fixers, achieve good fixation or correction, easy operation, and make up for difficult removal effects

Inactive Publication Date: 2008-07-23
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the NiTi alloy orthopedic fixer currently used only has a one-way shape memory effect. After being implanted in the human body and cooled to the martensitic temperature, the NiTi alloy orthopedic fixer will not return to the easy The shape of the removal makes it extremely difficult to remove the NiTi alloy orthopedic fixator, which brings great pain to the patient. Therefore, an easy-to-remove NiTi alloy orthopedic fixer is proposed.

Method used

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Experimental program
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specific Embodiment approach 1

[0005] Specific embodiment one: the manufacturing method of the easy-to-take-out NiTi alloy orthopedic fixer of the present embodiment is completed by the following steps: a, pretreatment step: adopt water-cooled copper crucible vacuum induction furnace smelting method, with a purity of 99.7% titanium sponge and The electrolytic nickel plate with a purity of 99.9% is used as a raw material, which is smelted under vacuum conditions to make a NiTi alloy ingot with an atomic ratio of Ni:Ti=0.92:1~1.08:1, and the impurity atomic percentage in the NiTi alloy ingot The content is: H≤0.003%, C≤0.050%, O≤0.050%. The NiTi alloy ingot is annealed, the annealing temperature is 850±10℃, the treatment time is 12h, and then forged in the temperature range of 750~900℃ , the rolling treatment with a deformation of 0.25 per pass is carried out at a temperature of 800-850 ° C, and finally annealing treatment is performed. The annealing temperature is 700 ± 10 ° C and the annealing time is 15 min...

specific Embodiment approach 2

[0006] Specific embodiment two: the difference between this embodiment and specific embodiment one is: in step a of this embodiment, the atomic ratio is Ni:Ti=1.03:1, and the percentage of impurity atoms is: H: 0.002%, C: 0.030%, O: 0.025% NiTi alloy ingots are annealed and forged. The annealing temperature is 850°C, the forging temperature is 780°C, and then rolling with a deformation of 0.25 per pass is carried out at a temperature of 830°C. and finally annealing at 700° C. to obtain a NiTi alloy plate or profile with a thickness of 4 mm. Pretreatment of the NiTi alloy ingot by adopting the above technical parameters can ensure the high strength and rigidity of the produced NiTi alloy plate or profile.

specific Embodiment approach 3

[0007] Specific embodiment three: the difference between this embodiment and specific embodiment one is: in the b step of this embodiment, the NiTi alloy plate or profile with an atomic ratio of Ni:Ti=1.03:1 is subjected to quenching treatment, and the quenching temperature is 800°C, the final temperature Af for transforming martensite into austenite in NiTi alloy sheet or profile is lower than 30°C. Nearly equal atomic ratio NiTi alloy plates or profiles are quenched at this temperature, so that the NiTi alloy plates or profiles have a satisfactory characteristic transformation temperature, even if the austenite in the NiTi alloy plates or profiles transforms into the initial stage of martensite Temperature Ms = -6 ~ 10 ° C, the end temperature M of austenite transformation into martensite f =-22~0℃, the initial temperature of martensite reversion to austenite As=2~25℃, the final temperature A of martensite reversion into austenite f =12~30℃.

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Abstract

A bone fixer able to be easily taken out is prepared from NiTi alloy through pre-treating, quenching at 780-830 deg.C, thermally mechanical treating with 0.2-0.3 strain for each deformation, bidirectional shape memory processing, cutting for shaping, and chemical polishing. It must be cooled at -6-10 deg.C before implantation or taking-out.

Description

technical field [0001] The invention relates to a manufacturing method of a NiTi alloy orthopedic fixer, in particular to a manufacturing method of an easy-to-take-out NiTi alloy orthopedic fixer. Background technique [0002] NiTi alloys are widely used in the field of biomedicine not only because of their pure biocompatibility, but more importantly because of their ability to integrate sensing and driving. The working principle of the current NiTi alloy orthopedic fixator mostly uses the shape memory effect. In the low-temperature martensitic state, the NiTi alloy orthopedic fixator is soft and can change its shape at will. After deformation, it is inserted into the human body at a temperature of about 37°C In the environment, the NiTi alloy orthopedic fixator will automatically and quickly return to its original undeformed (that is, after processing and shaping) shape, and immediately become hard, so as to complete the fixation or correction of the bone, and the NiTi allo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B17/56A61B17/68C22C14/00C22C19/00C22C1/00C22F1/00
Inventor 郑玉峰李莉刘喜亮周惠敏
Owner HARBIN ENG UNIV
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