Relevant bibliographies by topics / Bevel needle

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Bevel needle'

Author: Grafiati
Published: 4 June 2021
Last updated: 16 February 2022

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Journal articles on the topic "Bevel needle"

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Duffy, B. L. "“Don't Turn the Needle!”." Anaesthesia and Intensive Care 21, no. 3 (June 1993): 328–30. http://dx.doi.org/10.1177/0310057x9302100312.

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Accidental dural puncture is a well-recognised complication of epidural anaesthesia. The technique of inserting the epidural needle with the bevel parallel to the spinal ligaments is still taught in some centres. Evidence is presented that the subsequent turning of the needle to allow passage of the epidural catheter may increase the likelihood of dural puncture. There would also appear to be a greater chance of subdural catheterisation. The epidural needle should be introduced with the bevel in the direction in which the catheter is to go and not moved once the epidural space is located.
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Zhao, Yan-Jiang, Ze-Hua Liu, Yong-De Zhang, and Zhi-Qing Liu. "Kinematic model and its parameter identification for cannula flexible needle insertion into soft tissue." Advances in Mechanical Engineering 11, no. 6 (June 2019): 168781401985218. http://dx.doi.org/10.1177/1687814019852185.

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In minimally invasive surgery, flexible needle insertion is a popular application which has been extensively researched. However, needle steering is challenging for a bevel tip cannula flexible needle due to the nonholonomic constraints and the rebounds of the needle shaft when the needle tip is reoriented. We proposed a novel kinematic model for the bevel tip cannula flexible needle based on bicycle and unicycle models, taking consideration of the deflection of the bevel tip and the rebounds of the needle shaft. Aiming at different types of paths, forward kinematics of the model was analyzed and calculated. Each parameter of the kinematic models was identified based on the experimental data using the least square method. Furthermore, the changing rules of parameters were explored under different angles of the bevel tip. The experimental results show that the errors of the proposed kinematic models are within 2 mm, which is greatly reduced compared to the traditional bicycle or unicycle model, and fulfill a general clinical surgery.
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Wang, Yi Zhong, Qi Long Yin, Cheng Jie Liu, and Yong Hua Chen. "Towards an Articulated Needle." Applied Mechanics and Materials 152-154 (January 2012): 946–51. http://dx.doi.org/10.4028/www.scientific.net/amm.152-154.946.

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Needle is a kind of basic medical instruments in minimally invasive surgery. A thin and long needle is inserted into a human body through the skin to perform diagnosis and treatment tasks. In order to improve the steerability of a needle, articulated needle is proposed in this paper. An articulated needle consists of a head with a bevel-tip, several articulations and several sections. Articulations are much easier to be bent, which allows proposed articulated needle to be more easily controlled to achieve a complex curved trajectory. The structure of the articulated needle is investigated for improving its bending performance. The influences of the angle of bevel-tip, the sectional dimension of sections, the number of articulations, the maximum bending angle of articulations, and the distribution of articulations on the bending performance of the needle are studied, which provide the basis for path planning and navigation of an articulated needle.
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DOONER, JOHN J. "Needle Bevel Direction and Postlumbar Puncture Headache." Anesthesiology 71, no. 4 (October 1, 1989): 623. http://dx.doi.org/10.1097/00000542-198910000-00031.

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NORRIS, MARK C. "Needle Bevel Direction and Postlumbar Puncture Headache." Anesthesiology 71, no. 4 (October 1, 1989): 624. http://dx.doi.org/10.1097/00000542-198910000-00032.

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Angle, Pamela J., Jean E. Kronberg, Dorothy E. Thompson, Cameron Ackerley, John Paul Szalai, James Duffin, and Peter Faure. "Dural Tissue Trauma and Cerebrospinal Fluid Leak after Epidural Needle Puncture." Anesthesiology 99, no. 6 (December 1, 2003): 1376–82. http://dx.doi.org/10.1097/00000542-200312000-00021.

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Background The effects of epidural needle design, angle, and bevel orientation on cerebrospinal fluid leak after puncture have not been reported. The impact of these factors on leak rate was examined using a dural sac model. Dural trauma was examined using scanning electron microscopy. Methods Human cadaveric dura, mounted on a cylindrical model, was punctured with epidural needles using a micromanipulator. Tissue was punctured at 15 cm H2O (left lateral decubitus) system pressure, and leak was measured at 25 cm H2O (semisitting) pressure. Leak rates and trauma were compared for the following: (1) six different epidural needles at 90 degrees, bevel parallel to the dural long axis; (2) 18-gauge Tuohy and 18-gauge Special Sprotte epidural needles, 30 degrees versus 90 degrees; (3) 18-gauge Tuohy, bevel perpendicular versus parallel to the dural long axis. Results With the 90 degrees puncture, bevel parallel, the greatest leak occurred with a 17-gauge Hustead (516 +/- 319 ml/15 min), and the smallest leak occurred with a 20-gauge Tuohy (100 +/- 112 ml/15 min; P = 0.0018). A 20-gauge Tuohy puncture led to statistically significant reductions in leak (P value range, 0.0001-0.0024) compared with all needles except the Special Sprotte. With the 30 degrees versus 90 degrees angle, 30 degrees punctures with an 18-gauge Tuohy produced nonstatistically significant leak reductions compared with the 18-gauge Tuohy at 90 degrees. The puncture angle made no difference for the Special Sprotte. Nonsignificant reductions were found for the Special Sprotte compared with the Tuohy. With the 18-gauge Tuohy bevel orientation, perpendicular orientation produced nonstatistically significant reductions in leak compared with parallel orientation. Conclusions Cerebrospinal fluid leak after puncture was influenced most by epidural needle gauge. Leak rate was significantly less for the 20-gauge Tuohy needle.
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Roeder, Blayne A., Charles F. Babbs, William E. Schoenlein, Klod Kokini, and Farshid Sadeghi. "Self-sealing, Large Bore Arterial Punctures: A Counterintuitive New Phenomenon." Journal of Biomechanical Engineering 124, no. 4 (July 30, 2002): 342–46. http://dx.doi.org/10.1115/1.1488935.

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The human femoral artery can bleed dangerously following the removal of a catheter during cardiac catheterization. In this study, a modified technique of needle insertion, simply inserting the needle bevel-down instead of the standard bevel-up approach, was tested as a means to reduce bleeding after catheter removal. Large bore needle punctures were made in surgically exposed arteries of anesthetized pigs using either a standard technique (45 degree approach, bevel up) or a modified technique (25 degree approach, bevel down). For half the punctures, topical phenylephrine solution (1 mg/ml) was applied to the adventitia of the artery to cause constriction. Median bleeding rates were reduced from 81 to less than 1 ml/min/100 mmHg intraluminal pressure by the modified technique with application of phenylephrine. In most cases zero bleeding, that is self-sealing, of the arteries occurred. It is postulated that a flap-valve of tissue created by the modified technique produced this self-sealing behavior. Sophisticated modeling studies are needed to fully understand this new phenomenon.
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Murray, Timothy E., Damien C. O'Neill, and Michael J. Lee. "Accessing Implantable Ports: An Opportunistic Computed Tomography-Based Audit." Journal of the Association for Vascular Access 22, no. 4 (December 1, 2017): 193–98. http://dx.doi.org/10.1016/j.java.2017.09.002.

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Abstract Aim: Implantable ports are typically inserted by interventional radiologists or surgeons; however, daily maintenance, access, and de-access are often performed by members of nursing staff in accordance with manufacturers' guidelines and local policy. An audit of port access using retrospective computed tomography (CT) scanning was proposed. Methodology: Across a 4-year period, all CT scans performed for any reason while a port was accessed were reviewed. Results: Fifty-four CT scans of accessed ports were included. Mean depth of tissue between skin and port was 3.74 mm, and between port and pectoralis major was 5.91 mm. Port tilt in side-to-side and up-down axes measured 6.9° and 10.6°, respectively. Mean distance from needle to center of the septum was 1.96 mm. Mean distance from center of the chamber to the needle tip was 2.73 mm. In 2 cases (3.7%), the needle bevel was malpositioned, with the bevel still within the silicone-rubber septum. Mean angulation of the access needle from perpendicular was 11.5°. Angulation of the needle correlated with port tilt (r = 0.37; P = .006). Angle of the needle bevel relative to the port exit channel was 140.8°. No significant correlation between needle bevel directionality and needle angle, depth of port, or tilt of port was detected (all P values > .21). Conclusions: Variability in accessing of implantable ports is described relative to research- and manufacturer-recommended needle bevel angle, needle puncture angle, and central puncture position. The extent to which such deviation influences port function deserves focused clinical research.
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Xu, Yingqiang, Xuemei Qin, Guowei Liu, Lei Tan, Hongjian Dong, Pengpeng Wei, Qinhe Zhang, and Hongcai Zhang. "A new method for evaluating the normal rake angle and inclination angle on medical needles." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 232, no. 1 (November 22, 2017): 24–32. http://dx.doi.org/10.1177/0954411917742942.

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Hollow needles are the most frequently used medical equipment. The design of a hollow needle that best enables medical procedures requires a better understanding of needle tip geometry. Calculating the cutting angles of a needle for a complex surface topology is difficult. This article proposes a new method based on non-Euclidean geometry for the analysis of biopsy needle tip. The method can be used to calculate the cutting angles on any pipe needle. To verify the validity of this method, the normal rake angle and inclination angle on four types of needles (bias bevel needle, cylinder surface needle, curved surface needle and Cournand-type needle) were investigated. It was found that calculation of the cutting angles was simple and convenient using this method, especially for the curved surface needles. Images of the cutting angles from the Cournand-type needles revealed that the smaller bevel angle [Formula: see text] resulted in a higher normal rake angle [Formula: see text] and inclination angle [Formula: see text]. As [Formula: see text] increased, the range of the normal rake angle [Formula: see text] became larger at first and then became smaller.
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Kwon, Won Kyoung, Ah Na Kim, Pil Moo Lee, Cheol Hwan Park, and Jae Hun Kim. "Needle Tip Position and Bevel Direction Have No Effect in the Fluoroscopic Epidural Spreading Pattern in Caudal Epidural Injections: A Randomized Trial." Pain Research and Management 2016 (2016): 1–7. http://dx.doi.org/10.1155/2016/4158291.

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Background.Caudal epidural steroid injections (CESIs) are an effective treatment for pain. If the injection spreads in a specific pattern depending on the needle position or bevel direction, it would be possible to inject the agent into a specific and desired area.Objectives.We conducted a prospective randomized trial to determine if the needle position and bevel direction have any effect on the epidural spreading pattern in CESI.Methods.Demographic data of the patient were collected. During CESI, the needle position (middle or lateral) and direction (ventral or dorsal) were randomly allocated. Following fluoroscope-guided injection of 4 mL contrast media and 10 mL of injectates, the epidural spreading patterns (ventral or dorsal, bilateral or lateral) were imaged.Results.In the 210 CESIs performed, the needle tip position and bevel direction did not influence the epidural spreading patterns at L4-5 and L5-S1 disc levels. A history of Lumbar spine surgery was associated with a significantly limited spread to each disc level. A midline needle tip position was more effective than the lateral position in spreading to the distant disc levels.Conclusions.Neither the needle tip position nor the bevel direction affected the epidural drug spreading pattern during CESI.
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Dissertations / Theses on the topic "Bevel needle"

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Martanto, Wijaya. "Microinjection Into Skin Using Microneedles." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/11645.

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The development of microneedles that penetrate the skin barrier, but are small enough not to stimulate nerves, has the potential to deliver drugs across skin in a painless way. Controlled injection by convective flow into skin using hollow microneedles, however, has remained a challenge. To address this challenge, the goals of this study were (i) to provide experimental measurements coupled with numerical simulations to quantitatively describe fluid mechanics of flow within microneedles over a range of experimental conditions and needle geometries, (ii) to demonstrate and study the effects of diffusion-based delivery of insulin to diabetic rats in vivo using solid and hollow microneedles and (iii) to determine the effect of experimental parameters on microinfusion through hollow microneedles into skin to optimize drug delivery protocols and identify rate-limiting barriers to flow. Experimentally, we quantified the relationship between pressure drop and flow rate through microneedles as a function of fluid viscosity and microneedle length, diameter, and cone half-angle. Microneedle tip diameter and taper angle were the primary controlling parameters for flow through conically tapered microneedles as shown by numerical simulations. Flow rates over a range of 1.4 56 l/s were achieved through microneedles (in the absence of skin) with pressure drops in the range of 4.6 196.5 kPa. This work also studied the use of solid and hollow microneedle arrays to insert into the skin of diabetic animals for transdermal delivery of insulin. Blood glucose levels dropped by as much as 80% in diabetic rats in vivo. Larger drops in blood glucose level and larger plasma insulin concentrations were shown due to higher donor solution insulin concentration, shorter microneedles insertion time and fewer repeated insertions. The final scope of this work was to determine the effect of microneedle geometry and infusion protocols on microinfusion flow rate into skin in vitro. Infusion flow rates ranged from 21 to 1130 l/h was demonstrated using glass microneedles. The presence of a bevel at the microneedle tip, larger retraction distance and insertion depth, larger infusion pressure and the presence of hyaluronidase led to larger infusion flow rates.
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Cavassana, Sidnei [UNESP]. "Estudo sobre agulhas hipodérmicas: variação do esforço de penetração em um tecido artificial." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/151641.

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O medo da dor relacionada à injeção é um empecilho à terapia de injetáveis. As injeções hipodérmicas são motivos de grande ansiedade e de reduzida adesão à aplicação subcutânea de insulina para o controle glicêmico em diabéticos ou no tratamento da esclerose múltipla, aumentando o risco de complicações e mortalidade. Neste trabalho foi analisado como algumas das características da agulha podem influenciar a sensação de dor na injeção. Mediu-se o esforço de penetração de agulhas em um tecido artificial (modelo substituto da pele), para diferentes diâmetros de cânula, rugosidade, profundidade de penetração, lubrificação e ângulos do bisel da ponta perfurante. Este estudo visou encontrar alternativas para facilitar a aplicação e a autoaplicação de injeções hipodérmicas, aumentando a segurança e conforto, diminuindo a intensidade da dor percebida pelo paciente. Para isso, analisou-se no projetor de perfil e no MEV o bisel de agulhas usadas repetidas vezes para verificar a perda do perfil ou a formação de rebarbas que possam dificultar a penetração ou traumatizar o tecido durante o reuso de agulhas. Também foi analisado sob o ponto de vista mecânico, o que pode ser feito para prevenir que as agulhas usadas na aplicação subcutânea não atinjam inadvertidamente o músculo. O maior esforço de penetração observado nas agulhas com maior ângulo do bisel é responsável pela percepção de dor do paciente.
Fear of injection-related pain is a drawback to injectable therapy. Hypodermic injections are a cause for great anxiety and reduced adherence to the subcutaneous application of insulin for glycemic control in diabetics or in the treatment of multiple sclerosis, increasing the risk of complications and mortality. In this work, it was analyzed how some of the characteristics of the needle can influence the sensation of pain in the injection. The needle penetration effort was measured in an artificial tissue (substitute skin model) for different cannula diameters, roughness, depth of penetration, lubrication and angles of the perforating tip bevel. This study aimed to find alternatives to facilitate the application and self-application of hypodermic injections, increasing safety and comfort, reducing the pain intensity perceived by the patient. To do this, the bevel of needles used repeatedly was analyzed in the profile projector and SEM to verify the loss of the profile or the formation of burrs that could hamper the penetration or traumatize the tissue during the reuse of needles. It has also been mechanically analyzed, which can be done to prevent that the needles used in the subcutaneous application do not inadvertently reach the muscle. The greater penetration effort observed in the needles with greater angle of the bevel is responsible for the patient's perception of pain.
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Cavassana, Sidnei. "Estudo sobre agulhas hipodérmicas : variação do esforço de penetração em um tecido artificial /." Ilha Solteira, 2017. http://hdl.handle.net/11449/151641.

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Orientador: Aparecido Carlos Gonçalves
Resumo: O medo da dor relacionada à injeção é um empecilho à terapia de injetáveis. As injeções hipodérmicas são motivos de grande ansiedade e de reduzida adesão à aplicação subcutânea de insulina para o controle glicêmico em diabéticos ou no tratamento da esclerose múltipla, aumentando o risco de complicações e mortalidade. Neste trabalho foi analisado como algumas das características da agulha podem influenciar a sensação de dor na injeção. Mediu-se o esforço de penetração de agulhas em um tecido artificial (modelo substituto da pele), para diferentes diâmetros de cânula, rugosidade, profundidade de penetração, lubrificação e ângulos do bisel da ponta perfurante. Este estudo visou encontrar alternativas para facilitar a aplicação e a autoaplicação de injeções hipodérmicas, aumentando a segurança e conforto, diminuindo a intensidade da dor percebida pelo paciente. Para isso, analisou-se no projetor de perfil e no MEV o bisel de agulhas usadas repetidas vezes para verificar a perda do perfil ou a formação de rebarbas que possam dificultar a penetração ou traumatizar o tecido durante o reuso de agulhas. Também foi analisado sob o ponto de vista mecânico, o que pode ser feito para prevenir que as agulhas usadas na aplicação subcutânea não atinjam inadvertidamente o músculo. O maior esforço de penetração observado nas agulhas com maior ângulo do bisel é responsável pela percepção de dor do paciente.
Mestre
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Seifabadi, REZA. "TELEOPERATED MRI‐GUIDED PROSTATE NEEDLE PLACEMENT." Thesis, 2013. http://hdl.handle.net/1974/8054.

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Most robotic systems reported for MRI-guided prostate interventions use manual needle insertion, based on a previously acquired image, which requires withdrawing the patient from the scanner multiple times during the procedure. This makes the intervention longer, more expensive and elongating the discomfort to patient and, most importantly, less accurate due to the virtually inevitable motion of the target. As a remedy, automated needle placement methods were proposed, putting human supervision out of the control loop. This thesis presents the development of enabling technologies for human-operated in-room master-slave needle placement under real-time MRI guidance, while the patient is kept in the scanner and having the process of needle placement under continuos control of the physician. The feasibility of teleoperated needle insertion was demonstrated by developing a 1-DOF (degree of freedom) MRI-compatible master-slave system, which was integrated with a 4-DOF robot for transperineal prostate biopsy and brachytherapy. An accuracy study was conducted on a robotic system for MRI-guided prostate needle placement. Different error sources were identified and quantified. This study concluded that errors occurring during needle insertion have the most significant contribution to needle placement error. In order to compensate for these errors, teleoperated needle steering under real-time MRI guidance was proposed. A 2-DOF piezo-actuated MRI-compatible needle steering module was developed and integrated with the aforementioned 4-DOF transperineal robot, yielding a fully actuated 6-DOF (x, y, z, yaw, pitch, roll) robotic platform for MRI-guided prostate interventions. A novel MRI-compatible master robot was also developed to enable teleoperated needle steering inside the MRI room. MRI-compatible controller hardware and software were developed. A novel MRI-compatible force/torque sensor was devised using Fiber Bragg Grating for force measurement in MRI room. Phantom experiments proved the feasibility iii of teleoperated needle steering under real-time MRI guidance. A system was also developed for real-time 3D shape tracking of a bevel-tip needle with Fiber Bragg Grating sensors embedded along the needle shaft. The needle profile was overlaid on the real-time MR image, yielding real time navigation with accuracy better than 0.5 mm. The experimental system is presently being refitted for clinical safety and feasibility trials on real patients.
Thesis (Ph.D, Mechanical and Materials Engineering) -- Queen's University, 2013-05-30 12:26:18.732
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Book chapters on the topic "Bevel needle"

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Yong-de, Zhang, and Zhao Yan-jiang. "Kinematic Modeling of Bevel Tip Flexible Needle." In Intelligent Robotics and Applications, 405–16. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-16587-0_38.

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Bitner, Steven, Yam K. Cheung, Atlas F. Cook, Ovidiu Daescu, Anastasia Kurdia, and Carola Wenk. "Visiting a Sequence of Points with a Bevel-Tip Needle." In LATIN 2010: Theoretical Informatics, 492–502. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-12200-2_43.

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Prager, J. M., S. Roychowdhury, M. T. Gorey, G. Lowe, W. Ankenbrandt, and A. Ragin. "Bevel- versus pencil-point needles for myelography." In Proceedings of the XV Symposium Neuroradiologicum, 348–49. Berlin, Heidelberg: Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-642-79434-6_169.

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Giallanza, Antonio, Ferdinando Morace, and Giuseppe Marannano. "Design of a Close Power Loop Test Bench for Contra-Rotating Propellers." In Progress in Marine Science and Technology. IOS Press, 2020. http://dx.doi.org/10.3233/pmst200042.

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The aim of the research is to develop an azimuthing contra-rotating propeller for commercial applications with a power of 2000 kW. The thruster system is designed especially to be installed on high speed crafts (HSCs) for passenger transport with a cruising speed of about 35–40 knots. The topic is very useful because the azimuth thruster solutions currently do not find commercial applications in naval units for passenger transport. The latter are heavy, not very efficient from a hydrodynamic point of view and suitable for maximum cruising speed of about 18–20 knots. The study is interesting because among the advantages that these solutions provide are the possibility of transmitting very high torques and to guarantee a much longer life cycle. In more detail, the propulsion is realized by using a C-drive configuration, with a first mechanical transmission realized by using bevel gears mounted in a frame inside the hull, and a second transmission realized by bevel gears housed in a profiled hull at the lower end of a support structure. In the profiled hull will be installed the shafts of the propellers, in a contra-rotating configuration. In order to optimize the system before its industrial use, a close power loop test bench has been studied and designed to test high power transmissions. The test configuration allows to implement a back-to-back connection between two identical azimuthing contra-rotating propellers. Moreover, the particular test bench allows to size the electric motor simply based on the dissipated power by the kinematic mechanisms. Since the efficiency of these systems are very high, it is not necessary to use large electric motors, thus managing to contain the operating costs of the testing phase. The most significant disadvantage is the need to have two identical transmissions with consequent increase in installation costs. Through the back-to-back test bench it was possible to study the increase in efficiency compared to traditional systems.
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Bever, Edward. "Stalin’s Dilemma." In Handbook of Research on Serious Games as Educational, Business and Research Tools, 965–90. IGI Global, 2012. http://dx.doi.org/10.4018/978-1-4666-0149-9.ch050.

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Stalin’s Dilemma is an educational game that simulates the industrialization of the Soviet Union during the three Five Year Plans between 1928 and 1942 (Bever, 2000). The goal of the game is to reach or exceed the historical levels of industrial capacity, military effectiveness, and political stability in order to prepare the country to repel an attack by Nazi Germany, but with less human cost than was inflicted by Josef Stalin. This chapter describes the game and discusses its design, development, and use in various educational settings and structures. Its goal is to convey insights and lessons that can be applied to future development and employment of other instructional simulation games. The primary conclusions are the need to support a complex design with extensive player aids and to harness students’ competitiveness and ambition by directly connecting performance in the game to performance in the course.
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Hinton, David A. "Alfred et al." In Gold and Gilt, Pots and Pins. Oxford University Press, 2005. http://dx.doi.org/10.1093/oso/9780199264537.003.0009.

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A distinguishing feature of the ninth century is the amount of precious metal that has survived from it. Some of this comes from hoards, for in contrast to the eighth century there are several with both coins and objects, as well as some only with coins and some only with objects. The latest coin in a hoard provides no more than the earliest possible date at which it could have been deposited, but at least that is a fixed point in one direction, and its owner was unlikely to keep a store of coins for long without occasionally taking some out or putting others in. Objects in hoards, of course, may always include some treasured heirlooms, as may furnished graves, but at least perceived similarity to works in other media is not their only dating criterion. A few objects can be dated because they have an identifiable name on them. A gold and niello ring inscribed Ethelwulf R[e]x at the bottom of the bezel associates it with King Aethelwulf, ruler of Wessex from 839 to 858 (Fig. 4.1, right). The ring was not necessarily made for him to wear himself, but for him to give to a follower as a permanent reminder of the service owed to its donor, though a Beowulf seeking a ‘generous ring-giver’ might not have thought its inscription sufficient compensation for its modest weight. Alternatively, it could have acted like a seal, to accompany a royal messenger and validate that his news or instructions came from the king; or have been used as a guarantee of a land donation and a physical reminder of the event at which the grant had been made. That might have been the reason why the name of Queen Aethelswith was added to the back of another gold ring, thus associating it with Aethelwulf’s daughter, who was queen of Mercia from 853 to 874 (Fig. 4.1, left). The inscription may have been an afterthought, needed when the ring was used for an unanticipated purpose. A third explanation is that both rings were baptismal; above Aethelwulf’s name are two birds at the Fountain of Life, and the bezel of Aethelswith’s ring has the Lamb of St John the Baptist.
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Conference papers on the topic "Bevel needle"

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Misra, Sarthak, Kyle B. Reed, Andrew S. Douglas, K. T. Ramesh, and Allison M. Okamura. "Needle-tissue interaction forces for bevel-tip steerable needles." In 2008 2nd IEEE RAS & EMBS International Conference on Biomedical Robotics and Biomechatronics. BioRob 2008. IEEE, 2008. http://dx.doi.org/10.1109/biorob.2008.4762872.

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Gao, Dedong, Yong Lei, Bin Yao, Qiang Li, and Huiquan Bai. "Steerability and Kinematics of Bevel-Tip Flexible Needle." In ASME 2015 International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/msec2015-9268.

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Steerable flexible needles with bevel-tip are designed for many medical diagnoses and treatments. In this paper we present a new kinematic model for the bevel-tip flexible needle. Based on the analysis of needle deflection, the procedure of needle insertion can be decomposed of n sub-procedures, which are independent on the depth of insertion. In each sub-procedure, the tip is steered though the base to generate three motions with respect to the body-frame Oxiyizi: the rotation about zi, the translation along zi and the rotation about yi. The kinematics of flexible needle with bevel-tip is presented using the Denavit-Hartenberg method. The inverse kinematics of needle insertion is derived from the kinematic equation of flexible needle. The solution sets are discussed for the insertion consisting of consecutive rotation and insertion control actions. Furthermore, how to select suitable insertion position and orientation is discussed.
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Wang, Yancheng, Roland K. Chen, Bruce L. Tai, and Albert J. Shih. "Advanced Five-Plane Lancet Needle Design, Grinding, and Tissue Insertion." In ASME 2014 International Manufacturing Science and Engineering Conference collocated with the JSME 2014 International Conference on Materials and Processing and the 42nd North American Manufacturing Research Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/msec2014-4046.

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The needle with lancet point (NLP), having three planes at the tip to generate a sharp lancet point, is the most common needle tip geometry. This research presents two five-plane lancet needle designs, the five-plane lancet needle with two back bevels (FLN-B) and five-plane lancet needle with two front bevels (FLN-F), to study the effect of two additional bevel planes on the reduction of soft tissue insertion force over that of the NLP. The mathematical models for inclination and rake angles along the cutting edges, and the grinding procedure and setup parameters for FLN-B and FLN-F are developed. Prototype needles are fabricated and the needle insert test was conducted on PVC phantom tissue which mimics the soft tissue. Compared to NLP, FLN-B and FLN-F have higher inclination and rake angles and can reduce the insertion forces by 9.1% and 8.3%, respectively.
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Watts, Thomas, Riccardo Secoli, and Ferdinando Rodriguez y. Baena. "Needle Steerability Measures: Definition and Application for Optimized Steering of the Programmable Bevel-Tip Needle." In 2018 IEEE International Conference on Robotics and Biomimetics (ROBIO). IEEE, 2018. http://dx.doi.org/10.1109/robio.2018.8664772.

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Gidde, Sai Teja Reddy, Tololupe Verissimo, Nuo Chen, Parsaoran Hutapea, and Byoung-gook Loh. "Neural Network Modeling of Maximum Insertion Force of Bevel-Tip Surgical Needle." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-88383.

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Recently there has been a growing interest to develop innovative surgical needles for percutaneous interventional procedures. Needles are commonly used to reach target locations inside of the body for various medical interventions. The effectiveness of these procedures depends on the accuracy with which the needle tips reach the targets, such as a biopsy procedure to assess cancerous cells and tumors. One of the major issues in needle steering is the force during insertion, also known as the insertion (penetration) force. The insertion force causes tissue damage as well as tissue deformation. It has been well studied that tissue deformation causes the needle to deviate from its target thus causing an ineffective procedure. Simulation of surgical procedures provides an effective method for a robot-assisted surgery for pre- and intra-operative planning. Accurate modeling of the mechanical behavior on the interface of surgical needles and organs, specifically the insertion force, has been well recognized as a major challenge. Overcoming such obstacle by development of robust numerical models will enable realistic force feedback to the user during surgical simulation. This study investigates feasibility of predicting the insertion force of bevel-tip needles based on experimental data using neural network modeling. Simulation of the proposed neural network model is performed using Kera’s Python Deep Learning Library with TensorFlow as a backend. The insertion forces of needles with different bevel-tip angles in gel tissue phantom are measured using a specially designed automated needle insertion test setup. Input-output datasets are generated where the inputs are defined as bevel-tip angles and gel tissue phantom stiffness, and the output is defined as the insertion force. A properly trained neural network then maps the input data to the output data and the input-output dataset is supplied to train a neural network. Its performance is then evaluated using different and unseen input-output dataset. This paper shows that the proposed neural network model accurately predicts the insertion force.
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Xu, Jijie, Linwei Wang, Ken C. L. Wong, and Pengcheng Shi. "A meshless framework for bevel-tip flexible needle insertion through soft tissue." In EMBS International Conference on Biomedical Robotics and Biomechatronics (BioRob 2010). IEEE, 2010. http://dx.doi.org/10.1109/biorob.2010.5625943.

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Dong, Wei, Huimin Han, and Zhijiang Du. "The tip interface mechanics modeling of a bevel-tip flexible needle insertion." In 2012 IEEE International Conference on Mechatronics and Automation (ICMA). IEEE, 2012. http://dx.doi.org/10.1109/icma.2012.6283172.

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Huo, Benyan, Xingang Zhao, Jianda Han, and Weiliang Xu. "Shape reconstruction and attitude estimation of bevel-tip needle via CT-guidance." In 2015 IEEE International Conference on Robotics and Biomimetics (ROBIO). IEEE, 2015. http://dx.doi.org/10.1109/robio.2015.7418837.

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Secoli, R., F. Rodriguez, and Baena. "Experimental validation of curvature tracking with a programmable bevel-tip steerable needle." In 2018 International Symposium on Medical Robotics (ISMR). IEEE, 2018. http://dx.doi.org/10.1109/ismr.2018.8333302.

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Wang, Linze, Dedong Gao, Jiali Cui, Yan Zhao, and Juntao Zhang. "Research on Mechanical Properties of Bevel-Tip Needle Based on Image Guidance." In 2021 IEEE International Conference on Real-time Computing and Robotics (RCAR). IEEE, 2021. http://dx.doi.org/10.1109/rcar52367.2021.9517682.

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