Anhydrous Electropolishing Electrolyte for Stent Surface Quality
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Solution Overview
Problem
Conventional electropolishing solutions for metallic medical devices, such as stents, face issues with surface quality due to water poisoning, which leads to reduced efficiency and surface defects, as water can form insulating oxide layers and create gas bubbles that compromise the smoothness of the electropolished surface.
Innovation Solution
A substantially anhydrous electropolishing electrolyte solution is developed, using anhydrous alcohols and glycols as solvents, combined with a water sequestering agent like polyethylene glycol (PEG) to neutralize water molecules, maintaining the solution's anhydrous nature and preventing water-induced surface defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional water-based electropolishing solutions are used, then the electropolishing process can proceed, but water forms insulating oxide layers and gas bubbles that reduce surface quality and electropolishing efficiency
Solution Approach 1:
The patent changes the fundamental parameter of the electrolyte solvent from water-based to anhydrous alcohol-based (methanol, ethanol, isopropanol, or n-butanol). This parameter change eliminates water-related problems including insulating oxide layer formation and gas bubble generation, thereby simultaneously improving surface quality and maintaining electropolishing efficiency
Solution Approach 2:
The patent creates an inert electropolishing environment by using anhydrous alcohols as the electrolyte solvent and adding water-sequestering agents (such as molecular sieves, magnesium sulfate, or calcium chloride). This inert environment prevents water from interfering with the electropolishing process, eliminating surface defects and maintaining high efficiency
2Ease of manufacture
If water is present in the electropolishing solution, then the solution can be prepared easily, but water reduces the longevity of the electropolishing solution
Solution Approach 1:
The patent applies preliminary action by adding water-sequestering agents to the anhydrous electrolyte solution before the electropolishing process begins. These agents (molecular sieves, magnesium sulfate, calcium chloride, or polyethylene glycol) proactively bind any water molecules that enter the solution, preventing water-induced degradation and extending solution longevity
Solution Approach 2:
The patent introduces water-sequestering agents as intermediary substances that mediate between the anhydrous electrolyte and any water contamination. These intermediaries selectively bind water molecules through adsorption or chemical reaction, protecting the electrolyte system from water damage while allowing the electropolishing process to proceed
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 solution enhances electropolishing efficiency, extends the solution's longevity, and achieves a smoother, more uniform surface finish by preventing water interference, thereby improving the quality and durability of electropolished metal articles.
Implementation Method 1
The at least one water sequestering agent includes two or more hydrogen bond acceptors and two or more hydrogen bond donors
Implementation Method 2
Metal is removed from the anode surface by the action of the current and the electrolyte solution as current flows from the metal article (as the anode) to the cathode
Data Source
AI summary
Substantially anhydrous electropolishing electrolyte solutions. The substantially anhydrous electropolishing electrolyte solutions described herein do not use water as a solvent; instead, such electropolishing electrolyte solutions use anhydrous alcohols and/or glycols as a solvent. For example, an electropolishing electrolyte solution, as described herein, may include an alcohol, at least one mineral acid, and at least one water sequestering agent. Suitable examples of water sequestering agent include, but are not limited to, polyfunctional alcohols. Methods of electropolishing metal articles using such electropolishing electrolyte solutions are disclosed herein as well.