Medical Surface Microstructures for Coating-Free Liquid Repellency
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Solution Overview
Problem
Existing medical devices that come into contact with liquids or oils often rely on external coatings to achieve hydrophobic or oleophobic properties, which can detach and cause contamination or infection, lacking integration with the device's base material.
Innovation Solution
The integration of microstructures and nanostructures directly into the base material of medical devices using subtractive or additive processes, such as e-beam lithography and laser etching, to create pillars, pits, or hierarchical asperities, ensuring the surface remains hydrophobic or oleophobic without coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external coatings are applied to achieve hydrophobic or oleophobic properties, then the surface exhibits desired liquid-repelling behavior, but the coatings can detach and cause contamination or infection
Solution Approach 1:
The invention merges the hydrophobic/oleophobic surface properties directly with the base material by creating microstructures and nanostructures through subtractive or additive processes. This integration eliminates the coating layer that could detach, making the liquid-repelling properties an inherent part of the device surface rather than an external addition.
Solution Approach 2:
The invention extracts the harmful coating layer from the system and replaces it with microstructures and nanostructures created directly in the base material. By removing the coating dependency and using only the base material to create the desired surface properties, the source of potential contamination is eliminated.
2Reliability
If microstructures and nanostructures are created using subtractive or additive processes, then the surface becomes inherently hydrophobic or oleophobic without coatings, but the manufacturing complexity increases
Solution Approach 1:
The invention makes the base material multi-functional by enabling it to serve both as the structural foundation and as the source of hydrophobic/oleophobic properties. The same base material that forms the device structure is processed to create microstructures and nanostructures that provide liquid-repelling behavior, eliminating the need for separate coating materials and processes.
Solution Approach 2:
The invention changes the physical parameters of the base material surface by creating microstructures and nanostructures with specific dimensional characteristics. Through controlled modification of surface topology at micro and nano scales, the surface energy and wetting properties are altered to achieve inherent hydrophobicity or oleophobicity without changing the chemical composition.
3Reliability
If the surface is modified to include micrometer- or nanometer-sized structures, then the hydrophobic or oleophobic properties are enhanced, but the manufacturing precision requirements increase
Solution Approach 1:
The invention performs preliminary action by creating the microstructures and nanostructures during the base material fabrication process itself, before the device is assembled or deployed. By establishing the surface topology early in the manufacturing process through subtractive or additive methods, the durable hydrophobic/oleophobic properties are built into the device from the outset rather than requiring post-processing coating steps.
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
This approach provides a durable, contamination-free hydrophobic or oleophobic surface for medical devices, enhancing their performance and safety by maintaining material continuity and preventing coating detachment during use or implantation.
Implementation Method 1
air is trapped between the liquid and the substrate, causing the value of the contact angle to be greater than 90 degrees
Implementation Method 2
laser etching, to create pillars, pits, or hierarchical asperities
Data Source
AI summary
Device surfaces are rendered superhydrophobic and/or superoleophobic through microstructures and/or nanostructures that utilize the same base material(s) as the device itself without the need for coatings made from different materials or substances. A medical device includes a portion made from a base material having a surface adapted for contact with biological material, and wherein the surface is modified to become superhydrophobic, superoleophobic, or both, using only the base material, excluding non-material coatings. The surface may be modified using a subtractive process, an additive process, or a combination thereof. The product of the process may form part of an implantable device or a medical instrument, including a medical device or instrument associated with an intraocular procedure. The surface may be modified to include micrometer- or nanometer-sized pillars, posts, pits or cavitations; hierarchical structures having asperities; or posts/pillars with caps having dimensions greater than the diameters of the posts or pillars.