A mechanical device for anchoring hollow tube-like structures in the human body, such as blood vessels and ureters. It facilitates positioning needles or catheters in blood vessels and it prevents those from dropping out of the vessel or from “wandering off” in the vessel. The device can be used in every interventional medical situation for diagnostic or therapeutic purposes. The device is very easy to fix onto the vessel wall. Screwing is a fast technique saving operating time and requiring only basic microsurgical skills.
