Electroplated Part Coating Uniformity Without Organic Residues
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Solution Overview
Problem
Existing electroplating methods for medical devices result in organic residues on the electroplated layer, leading to adverse biological reactions and non-uniform thicknesses that can cause inflammation, cell proliferation, and lumen restenosis.
Innovation Solution
Control the content of organic residues in the electroplated layer to less than 0.1% and ensure a thickness ratio of 1:1 to 30:1 between the thickest and thinnest areas, using a controlled electroplating process with a fixture and auxiliary cathodes to achieve uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If organic additives are added to the electroplating solution to improve uniformity and brightness, then the quality of the electroplated part is improved, but organic residues are deposited on the electroplated layer causing adverse biological reactions
Solution Approach 1:
The patent removes organic additives from the electroplating solution entirely, extracting the harmful component while maintaining the electroplating process. This eliminates organic residue deposition on the electroplated layer while still achieving uniform coating through optimized inorganic electrolyte composition and electroplating parameters
Solution Approach 2:
The patent changes the chemical composition parameters of the electroplating solution by replacing organic additives with inorganic electrolytes and adjusts electroplating parameters (current density, temperature, time) to achieve the same uniformity and brightness effects without organic residue contamination
2Productivity
If conventional electroplating methods are used to achieve desired thickness, then the electroplating process is simple and scalable, but the thickness uniformity varies causing inflammation and cell proliferation
Solution Approach 1:
The patent implements feedback control by monitoring the electroplating process parameters and adjusting current density and time to maintain consistent thickness uniformity across multiple pieces. This ensures that each electroplated part achieves the target thickness ratio (1.05-1.20) without requiring complex post-processing
Solution Approach 2:
The patent optimizes electroplating parameters including current density (1-10 A/dm²), temperature (20-40°C), and time to achieve uniform thickness while maintaining high productivity. These parameter changes enable scale production with consistent quality and thickness uniformity
3Productivity
If organic additives are used to enhance electroplating efficiency, then the electroplating process is faster, but the organic residues cause toxicity and adverse reactions in the human body
Solution Approach 1:
The patent extracts and eliminates organic additives from the electroplating solution, removing the source of biological toxicity. The process maintains high efficiency through optimized inorganic electrolyte composition and electroplating parameters, achieving fast deposition without harmful organic residue
Solution Approach 2:
The patent changes the electrolyte composition from organic-based to inorganic-based and adjusts electroplating parameters to achieve the same or higher deposition rates. This parameter change eliminates biological toxicity while maintaining or improving electroplating efficiency
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method significantly reduces adverse reactions and ensures uniform electroplated layers, preventing inflammation and restenosis while maintaining mechanical integrity and biocompatibility.
Implementation Method 1
electroplating mainly includes two methods: rack plating and barrel plating
Implementation Method 2
placing a plating part in an electroplating solution for electroplating
Data Source
AI summary
An electroplated part, which contains hardly any organic residues and has a uniform electroplated layer. An electroplating method for preparing the electroplated part is also provided. By controlling the ratio of the length of the motion trajectory of the electroplated part relative to an anode during the electroplating process to the width of the anode, and adding auxiliary cathodes to the electroplated part, the electroplating method improves the uniformity of the thickness of the electroplated layer at various positions of the electroplated part. A fixture for implementing the electroplating method and an electroplating apparatus are provided. The electroplated layer of the electroplated part prepared by the electroplating method has relatively uniform thickness and a high coverage rate, problems such as burn and fracture have hardly occurred during the electroplating process of the electroplated part, the yield of electroplated parts is high, and the scrap rate is low. In addition, the precision of the weight of plated layers of electroplated parts can reach 99% or above.