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Nickel-titanium alloy electro-chemical polishing solution, surface treatment method and left atrial appendage plugging device

A nickel-titanium alloy and surface treatment technology, applied in medical science, electrolysis process, electrolysis components, etc., can solve the problems of low treatment efficiency and complicated surface treatment process, and achieve the effect of cost control, low density and high hardness

Active Publication Date: 2019-08-09
GUANGDONG PULSE MEDICAL SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In summary, the surface treatment process of the existing nickel-titanium alloy implantable medical device products is too cumbersome and the treatment efficiency is low, so it is necessary to improve the entire set of surface treatment process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A, add 235ml n-butanol, 15ml analytical pure perchloric acid (purity by 70% volume fraction, the same below) in the electrolytic cell under room temperature conditions, after mixing, dissolve 3g oxalic acid and stir as electrochemical polishing liquid.

[0039]B. Use white corundum sand with a particle size of 400 mesh under a spray pressure of 0.2 MPa to perform sandblasting on the heated and shaped umbrella-shaped fixture to remove the oxide layer.

[0040] C, the electrolytic cell is placed in the magnetic stirring low temperature constant temperature tank (the model is HCL-1012, and the manufacturer is Nanjing Shunma Instrument Equipment Co., Ltd., the same below), and the temperature of the electrochemical polishing solution is controlled at 0°C, and magnetically stir the electrochemical polishing solution at a speed of 800r / min. The stainless steel plate is used as the cathode, and the sandblasted umbrella-shaped fixture is used as the anode. After the cathode and...

Embodiment 2

[0046] A. Add 240ml of absolute ethanol and 20ml of analytically pure perchloric acid to the electrolytic cell at room temperature, dissolve 3.12g of citric acid after mixing and stir evenly as an electrochemical polishing solution.

[0047] B. Use white corundum sand with a particle size of 400 mesh under a spray pressure of 0.3 MPa to perform sandblasting on the heated and shaped umbrella-shaped fixture to remove the oxide layer.

[0048] C. Place the electrolytic cell in a magnetically stirred low-temperature constant-temperature tank, control the temperature of the electrochemical polishing solution at -5°C through the magnetically stirred low-temperature constant-temperature tank, and magnetically stir the electrochemical polishing solution at a speed of 600r / min. The stainless steel plate is used as the cathode, and the sandblasted umbrella-shaped fixture is used as the anode. After the cathode and the anode are immersed in the electrochemical polishing solution, the 24V ...

Embodiment 3

[0054] A. Add 240ml of n-butanol and 15ml of analytically pure perchloric acid to the electrolytic cell at room temperature, dissolve 3.06g of oxalic acid after mixing and stir evenly as an electrochemical polishing solution.

[0055] B. Use white corundum sand with a particle size of 400 mesh under a spray pressure of 0.4 MPa to perform sandblasting on the heated and shaped umbrella-shaped fixture to remove the oxide layer.

[0056] C. Place the electrolytic cell in a magnetically stirred low-temperature constant-temperature tank, control the temperature of the electrochemical polishing solution at 5°C through the magnetically stirred low-temperature constant-temperature tank, and magnetically stir the electrochemical polishing solution at a speed of 500r / min. The stainless steel plate is used as the cathode, and the sandblasted umbrella-shaped fixture is used as the anode. After the cathode and anode are immersed in the electrochemical polishing solution, a 48V DC stabilized ...

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Abstract

The invention relates to the field of implantable medical device processing, in particular to a nickel-titanium alloy electro-chemical polishing solution and a nickel-titanium alloy surface treatmentmethod applying the polishing solution. The polishing solution is prepared by mixing perchloric acid with the volume fraction being 70 percent and a solvent according to the volume ratio being 1:11 to1:16, and then adding a corrosion inhibitor according to the proportion of 12g / L, wherein the solvent is normal butanol or absolute ethyl alcohol, and a corrosion inhibitor is oxalic acid or citric acid. The treatment method adopts sand blasting to replace a conventional acid pickling process, and surface polishing and passivating are realized at the same time in an electrochemical treatment link, so that the treatment efficiency can be effectively improved, the product quality is ensured, and meanwhile, the generation of chemical waste liquid is reduced.

Description

technical field [0001] The invention relates to the field of implantable medical device processing, and specifically refers to a nickel-titanium alloy electrochemical polishing liquid, a nickel-titanium alloy surface treatment method using the polishing liquid, and a nickel-titanium alloy processed according to the nickel-titanium alloy surface treatment method. Heart appendage occluder. Background technique [0002] In the field of implantable medical devices, pure titanium and titanium alloys are generally considered to be the most promising candidate materials. In order to ensure the memory and mechanical properties of the material, such products made of nickel-titanium alloy must first be heated and shaped during the production process, which will generate an oxide layer on the surface of the workpiece. The oxide layer is directly related to the smoothness of the product's surface, which will affect the biocompatibility of the product. If the surface oxide layer falls o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25F7/00C25F3/22A61B17/12
CPCA61B17/12122C25F3/22C25F7/00
Inventor 徐亚伟阮成民陈维邓嘉铭吴庆桓姜亚伦林伟林
Owner GUANGDONG PULSE MEDICAL SCI & TECH CO LTD