Medical Instrument Surfaces With Coating-Free Superhydrophobic Structures
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing medical devices that come into contact with liquids often rely on external coatings to achieve hydrophobic or oleophobic properties, which can detach and cause contamination or infection, lacking integration of these properties within the device's base material.
Innovation Solution
The integration of microstructures or 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 characteristics, but the coatings can detach and cause contamination or infection
Solution Approach 1:
The invention merges the hydrophobic/oleophobic surface properties directly into the base material of the medical device through integrated microstructures and nanostructures. This eliminates the separate coating layer that could detach, by combining the surface functionality with the substrate itself, thereby preventing contamination while maintaining reliable liquid-repelling characteristics.
Solution Approach 2:
The invention creates a homogeneous structure where the microstructures and nanostructures are formed from the same base material as the device substrate. This material continuity ensures that the surface properties are inherently integrated rather than applied as separate layers, eliminating the risk of coating detachment and ensuring consistent performance throughout the device lifecycle.
2Reliability
If microstructures or nanostructures are integrated directly into the base material, then material continuity is maintained preventing coating detachment, but the manufacturing process becomes more complex
Solution Approach 1:
The invention replaces traditional mechanical coating application processes with advanced fabrication techniques such as e-beam lithography and laser etching. These techniques directly sculpt the base material into microstructures and nanostructures, eliminating the need for separate coating layers while achieving the desired surface properties through precise material removal or modification.
Solution Approach 2:
The invention utilizes parameter changes in the manufacturing process, such as varying laser power, pulse duration, or e-beam energy, to create different microstructure geometries and surface properties from the same base material. This allows for tunable surface characteristics without requiring different materials or coating layers, simplifying the overall device architecture while maintaining manufacturing flexibility.
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
The integration of microstructures or nanostructures directly into the base material of medical devices using subtractive or additive processes, such as e-beam lithography
Implementation Method 2
The integration of microstructures or nanostructures directly into the base material of medical devices using subtractive or additive processes, such as e-beam lithography and laser etching
Implementation Method 3
Surfaces with microscopic roughness tend to be hydrophobic. With such surfaces, air is trapped between the liquid and the substrate, causing the value of the contact angle to be greater than 90 degrees
Implementation Method 4
In nature, water droplets on the surface of a lotus leaf readily sit on the apex of organic nanostructures because air bubbles fill in the valleys of the structure under the droplet. Therefore, these leaves exhibit considerable superhydrophobicity
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.