MEDICAL SYSTEM AND METHOD FOR VIEWING AN ENTRY POINT OF A SURGICAL INSTRUMENT IN AN ANATOMICAL STRUCTURE, AND ASSEMBLY COMPRISING SUCH A MEDICAL SYSTEM AND A SURGICAL INSTRUMENT

摘要

The invention relates to a system comprising: a view measurement device adapted to emit an ultrasound view signal and receive a reflected view signal; a view processing device adapted to detect, in the reflected view signal, a target view echo corresponding to an interface between first and second anatomical structures, to measure a flight time between the emission of an ultrasound view signal and the detection of the target view echo, and to represent an external surface of the first anatomical structure from the measured flight times.

主权项

1. A medical system for viewing an entry point of a surgical instrument into a first anatomical structure of a body part of a patient, and for identifying a path of the surgical instrument within the first anatomical structure, the body part further comprising a second anatomical structure having a portion that covers the first anatomical structure, the first and second anatomical structures respectively having contact surfaces defining at least one interface, the first anatomical structure having an external surface, the second anatomical structure having an internal surface in contact with the external of the first anatomical structure, and an external surface opposite the first anatomical structure, the first and second anatomical structures respectively having first and second acoustic impedances, the first acoustic impedance being greater than the second acoustic impedance, the medical system comprising:
a view measurement device adapted for, in a plurality of sites of a viewing area of the external surface of the second anatomical structure:emitting at least one ultrasound view signal adapted to propagate in the body part and to be at least partially reflected at the interface between the first and second anatomical structures, and
receiving at least one reflected view signal corresponding to the reflection of a portion of the ultrasound view signal, the reflected view signal being in the form of a plurality of echoes of amplitudes that vary over time, a view processing device connected to the view measurement device), the medical system being characterized in that the view processing device is adapted for, at each site: detecting, in the reflected view signal, a target view echo (corresponding to the interface between the first and second anatomical structures that is next to the viewing area, the target view echo having an amplitude that exceeds a defined viewing threshold, measuring a time of flight between emission of the ultrasound view signal and detection of the target view echo, determining a depth at which the interface is located, based on the measured time of flight, and adapted for representing a portion of the external surface of the first anatomical structure that is next to the viewing area, based on the depths determined for the plurality of sites.