Endoscope Lens Regular Periodic Structures Anti-Fouling
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Solution Overview
Problem
Medical devices such as endoscopes face issues with adhesion of materials to their surfaces due to fouling and occlusion by body fluids and tissues, leading to reduced performance and clarity.
Innovation Solution
The implementation of regular periodic physical structures on the surfaces of medical devices, such as endoscopes, which can be hydrophobic or hydrophilic, utilizing asperities and nanoparticle coatings to create a Cassie-Baxter or Wenzel state, reducing adhesion and facilitating the removal of fluids and contaminants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional smooth surfaces are used on medical devices, then manufacturing is simple and cost-effective, but adhesion of body fluids and tissues causes fouling and occlusion of lenses
Solution Approach 1:
The surface is segmented into multiple scales of structures: micro-scale features (1-100 micrometers) and nano-scale features (1-100 nanometers). This hierarchical segmentation creates complex surface topography that prevents adhesion of body fluids and tissues, resolving the contradiction between manufacturing simplicity and anti-fouling performance.
Solution Approach 2:
The invention applies porous or textured coatings with controlled pore sizes and surface roughness to create low adhesion surfaces. These porous structures at micro and nano scales reduce the contact area between the surface and body fluids, preventing fouling while maintaining manufacturability through coating processes.
2Reliability
If hydrophobic coatings are applied to reduce adhesion, then lens fouling is reduced, but the coating may degrade or peel over time
Solution Approach 1:
The invention uses composite material systems combining organic and inorganic components, such as silane-modified polymers with ceramic particles or layered structures. These composites provide both the hydrophobic/hydrophilic properties for adhesion resistance and the mechanical strength for long-term durability, preventing degradation and peeling.
Solution Approach 2:
Different regions of the coating have different properties: the outer layer provides low adhesion through hydrophobic or hydrophilic characteristics, while the inner layer or substrate interface provides mechanical anchoring and durability. This local differentiation of properties resolves the contradiction between adhesion resistance and coating durability.
3Reliability
If regular periodic physical structures are created on surfaces, then adhesion and fogging are reduced, but manufacturing precision requirements increase
Solution Approach 1:
The invention optimizes key parameters of the surface structures, such as feature size (1-100 micrometers), surface energy, and roughness ratios, to achieve anti-fogging and low adhesion performance. By establishing specific parameter ranges rather than exact dimensions, the manufacturing precision requirements are reduced while maintaining effectiveness.
Solution Approach 2:
The invention creates surface structures that exceed the minimum theoretical requirements for low adhesion by incorporating both micro and nano-scale features. This partial over-engineering provides a buffer against manufacturing variations, allowing standard manufacturing processes to achieve the desired performance without requiring ultra-precise control.
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
These structures effectively reduce adhesion and fogging, maintaining clearer surfaces and improving the functionality of medical devices by allowing easier clearance of bio-materials like blood and tissue, enhancing the operational efficiency of endoscopes and other medical instruments.
Implementation Method 1
a surface on the lens region, where the surface includes a regular periodic physical structure
Implementation Method 2
utilizing asperities and nanoparticle coatings to create a Cassie-Baxter or Wenzel state, reducing adhesion
Implementation Method 3
utilizing asperities and nanoparticle coatings to create a Cassie-Baxter or Wenzel state, reducing adhesion
Implementation Method 4
utilizing asperities and nanoparticle coatings to create a Cassie-Baxter or Wenzel state, reducing adhesion
Implementation Method 5
nanoparticle coatings to create a Cassie-Baxter or Wenzel state
Data Source
AI summary
A medical device and associated methods are disclosed. In one example, the medical device includes an endoscope lens. In one example, the medical device includes a regular periodic physical structure. Examples of regular periodic physical structure may be formed from a bulk material of a component such as a lens, or a regular periodic physical structure may be formed as a coating.