Cladded Waveguide for Surgical Illumination
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Solution Overview
Problem
Conventional surgical illumination systems face challenges with heat buildup, weight, and inefficient light transmission due to the use of incandescent and semiconductor lighting, leading to excessive heating and poor illumination quality, especially when using waveguides made from materials like PMMA and polycarbonates, which suffer from frustrated total internal reflection (TIR) losses.
Innovation Solution
A surgical illumination system utilizing a non-fiber optical waveguide with an optical cladding layer of at least 350 nanometers thickness, made from materials like fluoroacrylate or polytetrafluoroethylene, to prevent evanescent waves from coupling to the environment, ensuring efficient light transmission and minimizing heat buildup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional waveguide materials (PMMA, polycarbonates) are used, then the waveguide can be manufactured with existing materials, but light transmission efficiency deteriorates due to frustrated total internal reflection losses
Solution Approach 1:
The patent applies composite materials by combining a waveguide core made from conventional materials (PMMA or polycarbonate) with an optical cladding layer made from fluoropolymer materials (fluoroacrylate or polytetrafluoroethylene). This composite structure allows the core to maintain manufacturing compatibility while the cladding layer provides superior optical properties that prevent frustrated TIR losses, thereby resolving the contradiction between ease of manufacture and light transmission efficiency.
2Illumination intensity
If overhead illumination with high intensity incandescent or semiconductor lighting is used, then the surgical field can be illuminated, but heat buildup occurs causing unwanted coagulation of blood and heating of patient's body
Solution Approach 1:
The patent replaces the conventional overhead illumination system (incandescent or semiconductor lighting) with a waveguide-based illumination system that delivers light directly to the surgical field. This substitution eliminates the heat-generating light sources from the overhead position, thereby resolving the contradiction between achieving sufficient illumination intensity and preventing harmful heat buildup in the surgical field and patient body.
3Illumination intensity
If overhead illumination systems are used, then the surgical field can be illuminated, but shadows are created in the illuminated body cavity or surgical field
Solution Approach 1:
The patent replaces the overhead illumination system with a waveguide-based system that positions the light source within or near the surgical field. This substitution allows light to be delivered from multiple angles and directly to the target area, eliminating shadow creation while maintaining illumination intensity, thereby resolving the contradiction between these two parameters.
4Device complexity
If conventional waveguide materials are used, then the waveguide can be integrated with surgical instruments, but light leakage occurs due to evanescent wave coupling to the environment
Solution Approach 1:
The patent applies composite materials by adding an optical cladding layer of fluoropolymer material around the conventional waveguide core. This cladding layer creates a lower refractive index boundary that prevents evanescent wave coupling to the surrounding environment, thereby eliminating light leakage while maintaining the integration capability of the waveguide with surgical instruments.
5Loss of energy
If thick optical cladding layer is added to prevent light leakage, then light transmission efficiency improves, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent specifies a precise parameter for the cladding layer thickness (at least 350 nanometers) to achieve the optimal balance between preventing light leakage and maintaining manufacturing feasibility. This parameter optimization resolves the contradiction by providing a specific thickness that is sufficient to prevent evanescent wave coupling while remaining practical for manufacturing processes.
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 system provides improved light conduction and reduced heat-related issues, maintaining illumination quality and comfort during lengthy procedures by preventing light leakage and heat accumulation, thus enhancing surgical field illumination.
Implementation Method 1
The optical cladding has a thickness of at least 350 nm to thereby prevent evanescent waves of conducted light from coupling to the environment surrounding the waveguide
Data Source
Figure 1A~1C
Figure 1D~1E
Figure 2~3
AI summary
Various surgical devices having integrated means of illuminating a surgical field are provided. Retractors, cannulas, suction devices and the like are disclosed having integrated optical waveguides coupleable to external lighting sources. The waveguides feature cladding layers configured to enhance transmission efficiency.