Hiu Man Yip

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In this paper, we present a new feedback method to automatically servo-control the 3-D shape of soft objects with robotic manipulators. The soft object manipulation problem has recently received a great deal of attention from robotics researchers because of its potential applications in, e.g., food industry, home robots, medical robotics, and manufacturing.(More)
In this paper, we analyse and present a control approach using the energy shaping formulation to explicitly regulate the applied force of a robot manipulator in contact with a purely elastic environment. The potential energy of the robot-environment system is shaped in a way that its local equilibrium implies the application of the desired force onto the(More)
In this paper, we address the positioning problem of remote centre of motion (RCM) mechanisms with uncalibrated image feedback from a monocular camera. Nowadays, RCM mechanisms are widely used in minimally invasive robotic surgery due to their ability to distally rotate a tool around a fixed entry port; note that in most surgical applications, the tools are(More)
This paper presents a new robotic system that assists surgeons in manipulating the endoscope during nasal surgical procedures. The presented robotic system has four degrees of freedom (DOF) arm with a wire-driven double parallelogram mechanism to control the three orientation angles and the insertion depth of the endoscope in the nasal cavity in a decoupled(More)
Remote center of motion (RCM) mechanisms are widely used in surgical robots to mechanically constrain the position of a certain point in the operation space. Examples of well-known RCM mechanisms include parallelogram mechanisms, spherical linkages, circular guiding arcs, etc. In this paper, a reinforced circular-guided RCM mechanism is presented. In the(More)
In this paper, we present a new robotic uterine positioner for total laparoscopic hysterectomy. The robot is designed to actively position the patient's uterus during surgery, a lengthy and tedious task that is traditionally performed by a human assistant. Safety is simply the most important concern when developing robots for surgical purposes; we address(More)
A new robotic system which assists surgeons in manipulating the uterus manipulator during total laparoscopic hysterectomy is presented in this paper. The presented robotic system is of four degrees of freedom (DOF) which composed of a 3-DOF robotic uterus manipulator positioner and a 1-DOF motorized uterus manipulator. To ensure safety of the patient,(More)
In this paper, we address the 3D position control of RCM-constrained instruments with monocular cameras. To compute the instrument's position from a single 2D image, we develop an innovative gradient descent algorithm which rotates and translates a line segment (over the plane spanned by the imaged instrument and the optical centre) until it best aligns(More)
This paper presents the development of an endoscope manipulator with passive and active structures for functional endoscopic sinus surgery (FESS). The 5-DoF passive structure has three translations and two rotations (T3R2) that allows the surgeon to manually place the endoscope near to the entry point during. The 4-DoF motorized structure (T2R2) actively(More)
Nowadays, robotic systems make use of compliant joint actuation to provide safe human-robot physical interactions, and in general, to improve the friendliness of the mechanism. However, note that with the introduction of these passive flexible elements, the actuators (which input the control actions) can not explicitly set the driving torque of the joints;(More)