17 accepted papers
The use of untethered miniature swimmers is a promising trend, especially in biomedical applications. These swimmers are often operated remotely using a magnetic field commonly generated using fixed coils that can suffer from a lack of compactness and heating issues. The analysis of the swimming cap
This letter deals with the development of a vision based control law to achieve high-accuracy automatic six degrees of freedom (DoF) positioning tasks. The objective of this work is to be able to replace a biological sample under an optical device for a non-invasive depth examination at any given ti
This paper proposes a new control-oriented model to compute the magnetic field created by a coil. A major challenge for untethered microscale mobile robotics is the control of objects for precise and fast displacements. In this work, we propose to use an alternative implementation of a model based o…
Flexible and helical magnetic microswimmers have been well reviewed in the literature because they could be exploited for envisaged applications such as targeted drug delivery, material removal, and micromanipulation. In this article, scaled-up versions of those robots are introduced to study in det…
This letter deals with the development of a vision-based controller for a continuum robot architecture. More precisely, the controlled robotic structure is based on three-tube concentric tube robot (CTR), an emerging paradigm to design accurate, miniaturized, and flexible endoscopic robots. This app
Magnetic continuum robots (m-CR) have grown interest in several applicative contexts that take benefits from their high flexibility and remote control. When submitted to external magnetic fields, m-CR exhibit large elastic deformations, which may lead to a highly nonlinear and complex behavior that
This letter discusses the development of a mosaicking algorithm for building large- and high-resolution confocal images. Due to the nature of optics and vision systems in general, there is still a dilemma between choosing a wide field-of-view and high resolution. The most accepted solution is to opt
Previously, we developed a 3D path following algorithm to improve the microrobot performances to overcome the modeling errors and environmental disturbances in order to perform real tasks, tested experimentally in a scaled-up helical microswimmer. In this paper, we show that adapting the propulsion…
The Remote Centre of Motion (RCM) is an essential movement for most of the medical robotic systems during the minimal invasive surgeries. In literature, there are many references which had analysed the techniques for modelling the problem of RCM constraint. However, only very few have discussed the…
This paper proposes the design of a vision-guided control law for microrobotic-assisted biomedical applications. More precisely, the developed control law is to servo an optical coherence tomography (OCT) system in real-time to carry out repetitive optical biopsy tasks. The OCT images are simultaneo
This paper addresses the problem of 3D path following of magnetic helical microswimmers in closed-loop. An error kinematic model in a local frame with sideslip and attack angles is used to express the motion of the helical microswimmer. A new derivation of the chained form with three inputs and five
A novel structure of a 2 DoF telescopic soft robot using a tri-layer Polypyrrole (PPy) soft micro-actuator with deployment is presented in this paper. The kinematic model is introduced and the Position Based Visual Servo (PBVS) control with path-planning and obstacle avoidance algorithms is develope…
This paper addresses the design of a partitioned vision-guided scheme for repetitive optical biopsies. More precisely, our approach uses two image modalities to perform 6 degrees of freedom (DOF) positioning task. The development aims to partition the control into 3 DOF controlled by the B-scan imag…
This paper deals with the development of a vision-based controller for robot-assisted medical applications. It concerns the use of shearlet coefficients in case of ultrasounds (US) images as visual signal inputs and the design of the associated interaction matrix. The proposed controller was validat…
This paper deals with the development of a new 6 degrees-of-freedom (DOF) vision-based controller for robot-assisted medical applications. The main objective is to use visual information extracted from Ultrasounds (US) images to control an US probe held by a robot. Instead of the conventional use of
This paper presents the development of a new visual servoing control law using global information image. It consists in the use of the wavelet spatial coefficients as the visual signal to design visual controller. More precisely, we introduce the concept of multiple resolution interaction matrix tha
In this paper, a method to predict the precision of parallel microstructures made of carbon fibers, polyimide layers and piezoelectric materials is proposed. To this aim, we propose to combine the exponential representation of transformation matrix with intervals to bound the uncertainties in each f…