Instrument guiding device

A device for guiding a medical instrument, comprising:

• the medical instrument,
• a monitoring appliance having a support and a medical imaging probe, which is arranged on the support and which is intended to be positioned in proximity to at least one target present in or on the patient,
• a screen, and
• a control unit which controls the device and which is connected to the screen and to the probe in order to generate at least one three-dimensional image,
• the control unit being configured to generate on the screen, from at least said three-dimensional image, at least one two-dimensional image showing a deformation of the instrument,
• the control unit being configured to estimate, from this deformation of the instrument, a virtual path of the instrument if insertion thereof were continued as far as the target, and to deduce therefrom at least one distance between said virtual path and the target,
• the control unit calculating, from several points of the deformed instrument that are selected on the three-dimensional image and/or on the two-dimensional image, a line formed by the deformed instrument,
• the control unit being configured to use this line in order to estimate the virtual path of the instrument.