Minimally invasive surgery (MIS) involves indirect observation of the surgical field through endoscope or similar devices and is carried out through the skin, through body cavities or anatomical openings.
As such, a fail-safe catheter guide system has to be developed. During the conceptual design phase, five key aspects for a fail-safe catheter guide system was specified. These aspects included the requirements, functions, environment, active structure and behavior of the system.The relevant spheres of influence were identified. Undesirable influences disturbing the operation of the system were marked as disturbance variables.This aspect describes the system elements, their attributes and the relationship between the elements of the system.
The aim is to define a system configuration for a safe and reliably guided catheter based on the function of MSS in IVR procedure and environmental factors. The IVR is a complicated procedure; therefore as the first step in the development of MSS for the catheter guide, the development of the MSS started from guiding the catheter in the vessel until it reaches the area of interest. The surgeons have to carry out some medical procedures before using the MSS which involves making a small incision in the patient’s body and inserting the catheter into the blood vessel and after that then the surgeon manipulates the master tool. The prototype development consists of a fail-safe catheter guide system. This section exemplifies the prototype development of an integral element of the catheter guide system, i.e. the slave system.We have developed a slave system with two degrees of freedom (DOF) using two actuators as the positions control. A roller mechanism has been chosen to generate infinite thrust movement of the catheter. In order to prevent the intervention, both the DOF must be independent and the catheter grasp mechanism needs to be fixed with one DOF only. Most of the parts were made of aluminium except for the thrust mechanism case, which was made from ABS resin using stereo lithography. Last but not least, we aim to build a prototype of the Master Slave System that consists of a master tool, a slave system and a complete control system. Once the prototype is completed, an experiment using MATLAB Simulink or an in-vivo experiment would be conducted. In this report, the current state of the prototype development for a slave system for the catheter guide system has been explained.
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In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.
Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...
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A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.
Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...
In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.
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The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.
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