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ABSTRACT: A simple, but yet effective application for learning and testing instrument manipulation of available (and future) master-slave control robot-assisted surgical systems has been created. As an example, the paper describes a simple mapping of da Vinci surgical system master-slave control with two haptic devices acts as the master control.
Studies in health technology and informatics 01/2012; 173:356-8.
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ABSTRACT: Our simulation framework for wound closure by suture is designed for education and training purposes. Currently, it is designed specifically to support a simulation of the Endo Stitch<sup>TM</sup> suturing instrument by Covidien, and could be extended for other surgical instruments designed for intracorporeal suturing. The framework allows the user to perform a virtual wound closure by suture with real surgical instrument handles customized to fit on haptic devices. The wound simulation is based on a triangular surface mesh embedded in a linear hexahedral finite element mesh, whereas the suture simulation is based on a simplified Cosserat theory of elastic rods. The simulation utilizes a combination of physically-based and control-based simulations.
Studies in health technology and informatics 01/2011; 163:461-5.
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ABSTRACT: This paper presents a real-time simulation of a virtual surgical suture, which is a physically-based model adapted from the Cosserat theory of elastic rods. The focus is on achieving a physically plausible simulation of the suture that can be simulated in real time. With simulation parameters adjustment, the virtual surgical suture can be accustomed to exhibit bending and twisting similar to a real suture. It is simple to implement and easy to extend for collision detections and interactions with other virtual objects. Its simulation is similar to a simulation of a composition of two mass-spring chains--for positions and orientations. Test results show that the virtual surgical suture can be used to tie knots in real time.
Studies in health technology and informatics 01/2011; 163:466-72.
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Advances in Visual Computing - 7th International Symposium, ISVC 2011, Las Vegas, NV, USA, September 26-28, 2011. Proceedings, Part II; 01/2011
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ABSTRACT: The Autosuture Endostitch device (Covidien, CT) is difficult to learn. In particular, the handle requires the use of a toggle which is unique in this instrument. We have developed a virtual reality trainer for the device that offers the use of the actual instrument handle while creating a visible virtual instrument tip complete with virtual needle and suture on a monitor. This report represents the development and initial validation experiments for the device.
Studies in health technology and informatics 02/2009; 142:145-7.
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ABSTRACT: We describe a fully interactive, low-overhead and robust peritoneum representation allowing for probing and cutting. The peritoneum implementation has been tested within a surgical illustration environment.
Studies in health technology and informatics 02/2009; 142:221-3.
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ABSTRACT: Modeling soft tissue for surgery simulation is a challenging task due to the complex way that the tissue can deform and interact with virtual surgical tools manipulated by user. One soft tissue that is ubiquitous but often not modeled, is fatty tissue. Here we present a novel fatty tissue model based on the mass-spring system on the Graphics Processing Unit (GPU) as part of our Toolkit for Illustration of Procedures in Surgery (TIPS). The user can interact with the fatty tissue in real time via a handheld haptic stylus that represents a virtual surgical tool in TIPS environment. The currently available interactions are palpation, grasp, and cut.
Studies in health technology and informatics 02/2008; 132:384-6.
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George Aslanidi,
Vadim Kroutov,
Glenn Philipsberg,
Kenneth Lamb,
Martha Campbell-Thompson,
Glenn A Walter, Sergei Kurenov,
J Ignacio Aguirre,
Pernille Keller,
Kurt Hankenson,
Ormond A Macdougald,
Sergei Zolotukhin
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ABSTRACT: The Wnt family of secreted glycoproteins had previously been shown to regulate diverse processes during early development. Wnt signaling also plays a key role in the homeostasis of adult tissues maintaining stem cell pluripotency and determining differentiating cell fate. The age-related decrease in Wnt signaling may contribute to increased muscle adiposity and diminished bone strength. In the current study, we investigated the long-term metabolic consequences of the upregulated Wnt/beta-catenin signaling in skeletal muscles of adult diet-induced obese (DIO) rats. To this end, we generated a recombinant adeno-associated virus (rAAV) vector encoding murine Wnt10b cDNA. The long-term expression of rAAV1-Wnt10b was tested after intramuscular injection in the female DIO rat. Animals fed high-fat diet and treated with rAAV1-Wnt10b showed a sustained reduction in body weight compared with controls, and expression of Wnt10b was accompanied by a reduction in hyperinsulinemia and triglyceride plasma levels as well as improved glucose homeostasis. Nuclear magnetic resonance methods revealed that ectopic expression of Wnt10b resulted in a decrease in both global and muscular fat deposits in DIO rats. The long-range effect of locally expressed Wnt10b was also manifested through the increased bone mineral density. The detailed analysis of molecular markers revealed fibroblast growth factor-4 and vascular endothelial growth factor as possible mediators of the systemic effect of Wnt10b transgene expression. Our data demonstrate that altering Wnt/beta-catenin signaling in the skeletal muscle of an adult animal invokes moderate responses with favorable metabolic profile, bringing the notion of alternative therapeutic modality in the treatment of obesity, diabetes, and osteoporosis.
AJP Endocrinology and Metabolism 10/2007; 293(3):E726-36. · 4.75 Impact Factor
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ABSTRACT: We have developed a computer based simulation process which allows a surgical expert to create a customized operative environment. This virtual environment, the Toolkit for Illustration of Procedures in Surgery (3D TIPS), is deployed on a low-cost computer system and requires minimal training for the programmer. The learner can be engaged in training immediately and the educator can modify the system and annotate the procedure to highlight specific points using video clips, operative images, and the like. A laparoscopic adrenalectomy is presented as a proof of concept in the accompanying article.
Surgical Endoscopy 07/2007; 21(6):1012-6. · 4.01 Impact Factor
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ABSTRACT: Good surgical training depends greatly on case experiences that have been difficult to model in software since current training technology does not provide the flexibility to teach and practice uncommon procedures, or to adjust a training scenario on the fly. The TIPS kit aims to overcome these limitations. To the expert, it presents visual and haptic tools that make illustrating procedures easy and can model unusual anatomic variations. For a non-specialist, it provides a locally customized learning environment and repeated practice in a safe environment. We used the toolkit to illustrate removal of the adrenal gland.
Studies in health technology and informatics 02/2007; 125:209-13.
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ABSTRACT: Real-time, plausible visual and haptic feedback of deformable objects without shape artifacts is important in surgical simulation environments to avoid distracting the user. We propose to leverage highly parallel stream processing, available on the newest generation graphics cards, to increase the level of both visual and haptic fidelity. We implemented this as part of the University of Florida's haptic surgical authoring kit.
Studies in health technology and informatics 02/2006; 119:255-60.
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ABSTRACT: The Autosuture⢠Endostitch⢠device (Covidien, CT) is difficult to learn. In particular, the handle requires the use of a toggle which is unique in this instrument. We have developed a virtual reality trainer for the device that offers the use of the actual instrument handle while creating a visible virtual instrument tip complete with virtual needle and suture on a monitor. This report represents the development and initial validation experiments for the device.
pages 145-147;
