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A surface treatment method

A surface treatment and pretreatment technology, applied in the field of surface treatment, can solve problems such as the reduction of bone fixation effect of bone screws and the weakening effect of screw threads on bone compression, etc., to achieve the effect of enhancing fixation effect, reducing gap, and simple process

Inactive Publication Date: 2016-03-23
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the mechanical anti-exit mode, the fixation effect of the bone screw on the bone mainly comes from the compression effect of the thread on the bone. As time goes on, the compression effect of the thread on the bone weakens, and the fixation effect of the bone screw on the bone decreases.

Method used

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Embodiment 1

[0029] The surface treatment method in the present embodiment one, comprises the steps:

[0030] A method for anti-loosening surface treatment of titanium alloy internal fixation bone screws, the treatment method is as follows:

[0031] Step 1, preparation of treatment solution: Calculated per liter of treatment solution, the amount of solute added is: 6g of sodium silicate, 3g of calcium acetate, 2g of sodium dihydrogen phosphate, 10g of sodium chloride, and the solvent is deionized water; prepare 10L Above-mentioned treatment liquid, finally adjust the pH value of solution with sodium hydroxide to be 10, stir and mix evenly;

[0032] Step 2, pretreatment: Soak titanium alloy internal fixation bone screws in 10% NaOH aqueous solution at 80°C for 10 minutes to degrease. 3 Derusting in aqueous solution for 5 minutes;

[0033] Step 3, place the titanium alloy internal fixation screw pretreated in step (2) in the prepared treatment solution, connect the titanium alloy internal ...

Embodiment 2

[0038] The surface treatment method in the present embodiment two comprises the steps:

[0039] Step 1, preparation of treatment solution: Calculated per liter of treatment solution, the amount of solute added is: 9g of sodium silicate, 4.5g of calcium acetate, 3g of sodium dihydrogen phosphate, 15g of sodium chloride, and the solvent is deionized water; 10L of the above treatment solution, finally adjust the pH value of the solution to 11 with sodium hydroxide, stir and mix evenly;

[0040] Step 2, pretreatment of titanium alloy screws: immerse titanium alloy screws in 10% NaOH aqueous solution at 80°C for 10 minutes for degreasing. 3 Derusting in aqueous solution for 5 minutes;

[0041] Step 3, place the titanium screw pretreated in step 2 in the prepared treatment solution, connect the titanium screw to the anode, use the stainless steel tank as the cathode, and process it under the action of direct current, control the voltage at 240V, and take it out after 60 minutes of ...

Embodiment 3

[0046] The surface treatment method in the present embodiment three comprises the steps:

[0047] A method for anti-loosening surface treatment of titanium alloy internal fixation screws, the treatment method is as follows:

[0048] Step 1, preparation of treatment solution: Calculated per liter of treatment solution, the amount of solute added is: 12g of sodium silicate, 6g of calcium acetate, 4g of sodium dihydrogen phosphate, 20g of sodium chloride, and the solvent is deionized water; prepare 10L The above-mentioned micro-arc oxidation treatment solution, finally adjust the pH value of the solution to 12 with sodium hydroxide, stir and mix evenly;

[0049] Step 2, pretreatment of titanium alloy screws: immerse titanium alloy screws in 10% NaOH aqueous solution at 80°C for 10 minutes for degreasing. 3 Derusting in aqueous solution for 5 minutes;

[0050] Step 3, place the titanium screw pretreated in step 2 in the prepared treatment solution, connect the titanium screw to ...

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Abstract

The invention provides a surface treatment method for preventing titanium alloy internal fixation bone screws from getting loose during the use. The surface treatment method comprises the following steps: taking a certain amount of sodium silicate, calcium acetate, sodium dihydrogen phosphate, sodium chloride and deionized water, mixing to prepare a solution in which the content of sodium silicate is 6-12 g / L, the content of calcium acetate is 3-6 g / L, the content of sodium dihydrogen phosphate is 2-4 g / L and the content of sodium chloride is 10-20 g / L, and adjusting the pH value of the solution to be 10-12 to obtain a treating fluid; deoiling, derusting and cleaning the bone screws, and then placing the processed bone screws into the treating fluid; selecting a power supply having a certain output voltage range, and connecting the positive pole of the power supply with the bone screws, connecting the negative pole of the power supply with an auxiliary electrode inserted into the treating fluid, or, connecting the negative pole with a container under the condition that the container is conductive to form a conducting loop, and under the action of a certain voltage, forming treatment layers on the surfaces of the bone screws; then cleaning and drying the bone screws.

Description

technical field [0001] The invention relates to a surface treatment method for preventing titanium alloy internal fixation bone screws from loosening during use. Background technique [0002] Clinically, internal fixation bone screws are often required to be fixed on damaged bone. After several decades of development of this method, the use of internal fixation bone screws to fix bones has become very common in clinical practice. Titanium alloy has good biocompatibility and comprehensive mechanical properties, and is currently the most commonly used material for manufacturing internal fixation bone screws. However, the combination between the current titanium alloy internal fixation bone screw and the bone is only mechanical interlocking, and the gap is relatively large, and fibrous tissue is easily formed in the gap, resulting in an unsatisfactory fixation effect of the bone screw on the bone. Due to the special physiological structure of the human body and frequent activ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/26
Inventor 马凤仓刘平李伟刘新宽陈小红何代华杨丽红
Owner UNIV OF SHANGHAI FOR SCI & TECH