Vein finder devices are a medical technology that shows a clinician the location of peripheral veins. It’s also called vein illumination or vein visualization. Modern vein finder devices are hand-held and do not come in contact with the patient.
The most capable devices use Augmented Reality (AR) to project the vein pattern back onto the patient’s skin. AR is a technology that enhances what you see with the naked eye to give you more information about what you’re looking at.
All vein finder devices rely on the principle that the hemoglobin in the blood absorbs infrared light more than the surrounding tissues in the body. Infrared is invisible to the human eye, so the device needs to take the vein image that it detects and re-project it back onto the patient in a visible color to become visible to the clinician.