Marie-Aude Vitrani

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— Visual servoing is a possible solution to assist the surgeon in performing tasks under ultrasound (US) imaging. To this aim, a system was developed that allows the surgeon to select a desired instrument location on a US image. Then a robot is programmed to automatically move the instrument towards the selected location. This approach requires robust(More)
— This paper presents a robust visual servoing approach for automatic guidance of an instrument. The visual sensor is an ultrasound probe that observes an instrument which is inserted into the beating heart of a patient and manipulated by a robot. The present paper provides stability analysis , robustification of the control law and an in vivo experiment .
— In recent years, there has been an increasing interest in developing systems that couple a robotic device with an ultrasound imager. Applications range from automatic probe positioning to ultrasound image-based guidance of instruments. One issue in these systems is to determine, prior to the intervention, the localization of the probe with respect to the(More)
— In this paper, the concept of ultrasound image-based force enhancement is introduced. It consists of a robotic comanipulation system that assists a surgeon performing an ultrasound exam through a minimally invasive access. The robot is programmed in such a way that the surgeon's feeling of the distal contact between the probe and the organ is enhanced,(More)
— A novel robotic device, aimed at assisting a urol-ogist in performing prostate biopsies guided by an endorectal ultrasound probe, is described. The paper describes the robot kinematics and the actuation system. The actuation system combines electromagnetic brakes, balancing springs, and electrical motors with cable transmissions. The robot supports two(More)
— The possibility to provide an adequate task assistance using underactuated robots for human-robot tool comanipulation is investigated. This novel approach does not take into account any a priori knowledge about user depending parameters however optimizes the robot-user synergy, for instance during US breast examinations. Results show that the examination(More)
PURPOSE A comanipulator for assisting endorectal prostate biopsies is evaluated through a first-in-man clinical trial. This lightweight system, based on conventional robotic components, possesses six degrees of freedom. It uses three electric motors and three brakes. It features a free mode, where its low friction and inertia allow for natural manipulation(More)