Twistlight is a light-assisted application aid to increase first stick success in vein-puncture. The handy device makes it easier to detect veins, even veins in bad condition, and helps you to quickly insert an IV line thanks to its integrated catheter feed. Twistlight uses LED light in a diagnostically relevant wavelength to project it into the dermal tissue. It thus makes veins appear highly contrasted within its surrounding dermal tissue. Because the second hand is required to calm down the patient, undo the vein strap, tension the skin and fix the catheter in place when pulling out the steel stylet, the device incorporates an integrated catheter feed and catheter guidance, allowing the device to be operated single-handedly. Battery-powered and handy TWISTLIGHT can be used both in hospitals or doctor‘s office and emergency ambulance.