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• W2043988369 abstract "To the Editor.—Using a video camera, one of us (Dr Tsunoda) tried to monitor his children at night. Because the room in which they slept did not provide sufficient light for normal recording, the recording mode was changed to night-shot mode using an infrared light source. Although he could not distinguish his children's veins in the darkened room with his naked eye, the veins were clearly visible under the skin surface when viewed on the video monitor. This suggested that an infrared light would be helpful in detecting subcutaneous veins in the clinical setting.On the basis of this information, we developed a new system to detect “invisible” veins with the naked eye using an infrared light source and monitoring camera. Numerous commercially available light-emitting diodes of various wavelengths were evaluated to determine which was the most suitable for detecting veins through the skin before selecting the wavelengths of 760, 890, and 910 nm. Figure 1 shows our new system, and Fig 2 illustrates the difference between an ordinary (Fig 2A) and an infrared (Fig 2B) light source (890 nm) on the monitor. Veins that appeared invisible under the ordinary light source were clearly visualized under infrared light on the monitor with the naked eye.Oxyhemoglobin and hemoglobin absorption bands in the visible spectral range were first investigated by Hoppe-Seyler in 1862.2 Many reported use of the wavelength of 632.8 nm for the optical analysis of blood, whereas typical blood oximeters use wavelengths of ∼660 and 890 nm.3 Commercially available vein-authentication systems generally use a wavelength of 760 nm. The differences in wavelength are based on whether investigations are performed in vitro or in vivo, when the thickness of the skin and subcutaneous fat tissue are factors. We studied many volunteers using the new device and found that the most suitable wavelength differed in each person depending on skin thickness. Finally, the most suitable wavelength for detecting subcutaneous veins was determined to range between 760 and 910 nm.Many previously open surgeries are now routinely performed endoscopically with video monitoring. In combination with palpation, our new system will benefit both patients and medical staff during the collection of blood samples and administration of intravenous drip infusions in individuals in whom such procedures would otherwise be difficult to perform. In addition, it may contribute to better relationships among patients, their families, and medical staff." @default.
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• W2043988369 date "2007-02-01" @default.
• W2043988369 modified "2023-09-30" @default.
• W2043988369 title "Good News for Patients and Medical Staff: A New System to Assist With Intravenous Procedures" @default.
• W2043988369 cites W1988098463 @default.
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• W2043988369 doi "https://doi.org/10.1542/peds.2006-3144" @default.
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