Surgical Lamp Broadband Narrowband Tissue Discrimination
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Solution Overview
Problem
Current surgical lamps fail to enable clear observation and discrimination between different tissues, particularly between normal and cancerous tissues, due to the human eye's inability to distinguish subtle optical effects in a wide spectral range.
Innovation Solution
A surgical lamp with a first light source having a high color rendering index for accurate color representation and a second light source with a dedicated spectral composition to enhance contrast between tissues, utilizing diffuse reflectance spectroscopy and selective emission of light in specific spectral ranges to highlight differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a single broadband light source is used for illumination, then the illumination covers a wide spectral range, but the human eye cannot distinguish subtle optical effects and discriminate between different tissues
Solution Approach 1:
The surgical lamp divides the broadband illumination into multiple separate narrowband light sources, each emitting at a specific wavelength or narrow spectral range. This segmentation allows each light source to target specific optical absorption features of different tissues, enabling the human eye to distinguish tissue types based on their differential absorption characteristics at these specific wavelengths.
Solution Approach 2:
Different light sources are assigned different spectral characteristics (specific wavelengths or narrow bands) to illuminate different regions or aspects of the tissue. This local quality approach allows optimization of illumination for specific tissue discrimination tasks, such as using 420nm for hemoglobin detection or 280nm for protein detection, rather than using a single broadband spectrum.
2Measurement precision
If multiple light sources with different spectral compositions are used, then tissue discrimination is improved, but the device complexity increases
Solution Approach 1:
The surgical lamp is designed as a multi-functional device that can perform multiple tissue discrimination functions using a set of standardized narrowband light sources. Each light source can be selectively activated depending on the specific tissue discrimination task required, making the device universally applicable for different surgical needs while maintaining a manageable level of complexity through modular design.
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 surgical lamp enhances visual discrimination between tissues by providing a high color rendering index for accurate color perception and a low color rendering index to accentuate specific tissues, allowing for better identification of cancerous or other tissue types during surgical procedures.
Implementation Method 1
a first light source capable of emitting light across a broad first spectral range having a first color rendering index of 85-100
Implementation Method 2
a second light source having a dedicated spectral composition capable of emitting light having an emission peak in a narrow second spectral range with a second color rendering index of 0-84
Implementation Method 3
Diffuse reflectance spectroscopy may be used to distinguish between different tissues, such as normal, benign and cancerous tissues, by comparing the average amplitudes of diffuse light
Data Source
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AI summary
The present invention relates to a surgical lamp (100) comprising both a first light source (110) and a second light source (112), where the first light source is capable of emitting light across a broad first spectral range and the second light source being capable of emitting light having an emission peak in a narrow second spectral range. The surgical lamp further features a light source selecting device (120), capable of selectively turning on and off the first and the second light source. The first light source has a high color rendering index so as to enable objects, such as tissues, to appear in their true color, and the second light source has a low or non-definable color rendering index, so as enable accentuation of particular tissues.