👉 In the context of science, etuis are a type of device used in medical procedures to measure blood flow and pressure. They consist of a small tube (often called an "euronema") that is inserted into the body through a small incision or puncture. The euronema is then attached to a computer monitor or other electronic equipment, which measures the flow and pressure of blood flowing through the euronema. Etuis are often used in emergency situations where blood loss is