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10 results for “minimally invasive surgery”
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Research ArticleOpen accessPhrase in the titleInvestigations on the Grasping Contact Analysis of Biological Tissues With Applications in Minimally Invasive SurgeryAli Bonakdar, Javad Dargahi, Rama BhatAnalytical and finite element methods are employed to determine the contact pressure on the surface of a tissue being grasped by an endoscopic grasper, in Minimally Invasive Surgery (MIS). Normally, an endoscopic grasper is corrugated (teeth-like) in order to grasp slippery tissues. It is highly important to avoid damage to the tissues while grasping and manipulation during endoscopic surgery. Therefore, … …American Journal of Applied Sciences, Vol. 4, Issue 12 · 31 Dec 2007 · 6,905 accessesView PDFCite
Research ArticleOpen accessPhrase in the titleMathematical Modeling of a Tactile Sensor with Applications in Minimally Invasive SurgeryAshkan Mirbagheri, Siamak Najarian, Javad Dargahi, Farhad Tabatabai GhomsheThis paper describes mathematical modeling of a novel supported tactile sensor. This system has only three or four sensing elements instead of an array configuration. By writing a code, together with using the piezoelectric capabilities of the finite element analysis software, it is possible to extract the stresses developed in the tactile membrane along the edges of the sensing elements, … …American Journal of Applied Sciences, Vol. 4, Issue 10 · 31 Oct 2007 · 7,186 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleInvestigation of Inflammatory and Oxidative Stress Biomarkers in Multi Vessels Minimally Invasive Coronary Artery Bypass Graft Surgery Versus Off-Pump Coronary Artery Bypass GraftMohammed Farouk Abdel-Hafez, Ahmed El-Minshawy, Ahmed M. Taha et al.Traditional Coronary Artery Bypass Graft (CABG) is currently among of the chief methods in dealing with patients suffering from atherosclerotic coronary heart disease. The current study aimed to measure and compare the levels of proinflammatory cytokines and oxidative stress marker in patients who underwent multivessels Minimally Invasive Coronary Artery Bypass Graft Surgery (MICS– CABG) versus off-pump Coronary Artery Bypass Grafting … …American Journal of Biochemistry and Biotechnology, Vol. 17, Issue 3 · 29 Sep 2021 · 6,170 accessesView PDFCite
Research ArticleOpen accessIn the keywordsA Novel Tactile Force Probe for Tissue Stiffness ClassificationBehafarid Darvish, Siamak Najarian, Elham Shirzad, Roozbeh KhodambashiIn this study, we have proposed a new type of tactile sensor that is capable of detecting the stiffness of soft objects. The sensor consists of a brass cylinder with an axial bore. An iron core can easily move inside the bore. Three peripheral bobbins were machined in the cylinder around which three coils have been wound. One of the … …American Journal of Applied Sciences, Vol. 6, Issue 3 · 31 Mar 2009 · 7,286 accessesView PDFCite
Research ArticleOpen accessIn the keywordsDesign, Fabrication, and Testing of a Membrane Piezoelectric Tactile Sensor with Four Sensing ElementsAshkan Mirbagheri, Javad Dargahi, Siamak Najarian, Farhad Tabatabai GhomsheWe presented design, fabrication, and testing of a novel membrane tactile sensing system with only four sensing elements. By using membrane stress combined with triangulation approach, it was possible to overcome the problems such as cross-talk between sensing elements, fragility, and complexity. The fabrication of the sensing elements performed using photolithographic and etching techniques. Position, orientation, and magnitude of applied … …American Journal of Applied Sciences, Vol. 4, Issue 9 · 30 Sep 2007 · 7,072 accessesView PDFCite
Research ArticleOpen accessIn the keywordsA Novel Modeling Approach for Collision Avoidance in Robotic SurgeryReza Ramezanifard, Javad Dargahi, Siamak Najarian, Farhad Tabatabai GhomsheWe present a new system that can be used in combination with an array of ultrasonic piezoelectric sensors and has application in surgical navigation procedures. Using the proposed assembly, the maneuverability of the surgical tools can be enhanced and the incidence of potentially damaging contact with non-target tissue can be reduced. The emphasis of our work was based on controlling … …American Journal of Applied Sciences, Vol. 4, Issue 9 · 30 Sep 2007 · 6,795 accessesView PDFCite
Research ArticleOpen accessIn the abstractFuture Medicine Services RoboticsRelly Victoria V. Petrescu, Raffaella Aversa, Antonio Apicella, Florian Ion T. PetrescuIt is an entry technique in use recently, albeit in selected centers and represents a further step in the field of minimally invasive surgery. Basically it has the same indications but, at present, is reserved for selected patients. Compared to traditional video-assisted surgery presents some important differences. The surgeon is physically distant from the operative field and sits at a … …American Journal of Engineering and Applied Sciences, Vol. 9, Issue 4 · 26 Nov 2016 · 8,889 accessesView PDFCite
Research ArticleOpen accessIn the abstractFabrication of a Capacitance-Based Tactile Sensor with Biomedical ApplicationsAli Tavakoli Golpaygani, Siamak Najarian, M. Mehdi Movahedi, Goldis Darb EmamiehThe design, modeling, and testing of a flexible tactile sensor and its applications are presented. This sensor is made of polymer materials and can detect the 2D surface texture image and contact-force estimation. The sensing mechanism is based on the novel contact deflection effect of a membrane. We measure the amount of membrane deflection with measuring the change of capacitance … …American Journal of Applied Sciences, Vol. 5, Issue 2 · 28 Feb 2008 · 7,388 accessesView PDFCite
Research ArticleOpen accessIn the abstractExperimental and Theoretical Analysis of a Novel Flexible Membrane Tactile SensorGoldis Darb Emamieh, Ahmad Ameri, Siamak Najarian, Ali Tavakoli GolpayganiIn this study, we report the development of a new multi tactile sensor, capable of detecting 2D surface texture image, measuring contact-force, and identifying the difference between stiffness of sensed objects. The designed tactile sensor consists of a chamber and a membrane with a mesa structure. The detecting principle is a combination of membrane deflection and piezoresistance effects. A major … …American Journal of Applied Sciences, Vol. 5, Issue 2 · 28 Feb 2008 · 7,184 accessesView PDFCite
Research ArticleOpen accessIn the abstractDesign and Modeling of a New Tactile Sensor Based on Membrane DeflectionAli Tavakoli Golpaygani, Siamak Najarian, Goldis Darb EmamiehThe designed sensor can detect 2D surface texture image, contact-force, and softness of the sensed object. It consists of a chamber for pneumatic actuation and a membrane with a mesa structure. The sensing mechanism is the contact deformation effect of a membrane. Determination of the contact force and softness of sensed object is based on the amount and variations of … …American Journal of Applied Sciences, Vol. 4, Issue 10 · 31 Oct 2007 · 6,786 accessesView PDFCite