Abstract: The invention relates to a holder device (1) for medical instruments, including endoscopes, or cannulas, such as those that are used within the framework of minimally invasive surgery or interventional radiology. Proceeding from a state of the art in which the treating physician knows holder devices (1) and guidance systems, an improved holder device (1) is proposed within the framework of the invention, which makes it possible, at any time, to uncouple the holder device (1) and, if applicable, the guidance system connected with the holder device (1), from the medical instruments or cannulas held with the holder device (1), without having to retract or remove the instruments or cannulas.