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LED light source for spectral dyeing illumination of medical

Time:2020-07-25 23:06 Click:/Second

LED light source for spectral dyeing illumination of medical endoscope and illumination method and process
The invention relates to a medical equipment, in particular to an LED light source for spectral dyeing and illumination of medical endoscopes. The invention also relates to an LED illumination method for spectral dyeing illumination of medical endoscopes.
Background technique:
The cold light source used in traditional endoscopes is divided into halogen, xenon lamp, LED and other light source driving devices. Among them, the cost of halogen light source is relatively low, but because the color rendering index is not high, it can only meet the needs of general endoscope lighting. The color temperature and color rendering index of xenon light source It can basically meet the needs of endoscope lighting, but its high cost, high energy consumption and short lifespan also restrict its application on endoscopes. Although the current general LED lighting technology has made great progress, it has a color rendering index. It is still difficult to meet the needs of high-definition and high-contrast endoscopes.
In recent years, the endoscopic camera technology has made great progress. The image clarity and contrast have been greatly improved. Under ordinary white light, the shape and color of the lesions (such as raised lumps and sunken ulcers) have changed significantly. ) Can be displayed clearly. However, it is difficult to diagnose and even missed diagnosis for small, flat early cancer and dysplasia. In recent years, foreign endoscopy companies have introduced a large number of technologies such as pigment endoscopy, electronic spectroscopy, narrow-band imaging, optical biopsy, and fluorescence imaging, which have greatly improved the diagnosis of early cancer.
Studies have shown that in the visible spectrum, the penetration depth of photons into mucosal tissue is related to the wavelength of the illuminating light source. The shorter the wavelength, the shallower the penetration depth into mucosal tissue. In addition, hemoglobin is the main substance that absorbs visible light and absorbs blue and green light. It has a high rate and basically does not absorb red light.
Studies have shown that the superficial capillaries on the mucosal surface of the digestive tract have a high absorption rate of blue light at 415nm, while the subcutaneous capillaries have a high absorption rate of green light at 540nm.
The wavelength range of the ordinary light source for endoscopes is 400nm-800nm, which has good illumination for ordinary imaging, but it cannot improve the imaging contrast of mucosal capillaries and subcutaneous capillaries. The use of narrowband imaging and electronic dye imaging endoscopy successfully solved the above problems.
The narrow-band illumination imaging technology launched by a Japanese company uses a narrow-band interference blue/green filter to generate a blue/green narrow-band light wave with a center wavelength of 415nm, 540nm and a bandwidth of 30nm. But this system also has some flaws:
1. Gastrointestinal pathology is not completely related to changes in submucosal blood vessels.
For example, some polyps with a tendency to become malignant, theoretically, the changes in the morphology of their surface mucosa are much more obvious than the changes in the blood vessels in the mucosa, and this is not visible to the NBI.

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