Добірка наукової літератури з теми "Lateral decompression"

Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями

Оберіть тип джерела:

Ознайомтеся зі списками актуальних статей, книг, дисертацій, тез та інших наукових джерел на тему "Lateral decompression".

Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.

Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.

Статті в журналах з теми "Lateral decompression":

1

Sweeney, Adam R., Solomon S. Shaftel, Sarah M. Jacobs, and Arash Jian-Amadi. "Lateral Wall Orbital Decompression." Journal of Craniofacial Surgery 28, no. 2 (March 2017): 379–82. http://dx.doi.org/10.1097/scs.0000000000003299.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
2

Frankel, Joshua, and Angela Hitch. "Deep Lateral Wall Decompression." American Journal of Ophthalmology 142, no. 2 (August 2006): 352. http://dx.doi.org/10.1016/j.ajo.2006.03.035.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
3

Welch, Julie L., and Nicholas Saltarelli. "Tension pneumothorax: Lateral needle decompression." Visual Journal of Emergency Medicine 10 (January 2018): 118–19. http://dx.doi.org/10.1016/j.visj.2017.11.022.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
4

Nakashima, Hiroaki, Tokumi Kanemura, Kotaro Satake, Kenyu Ito, Yoshimoto Ishikawa, Jun Ouchida, Naoki Segi, Hidetoshi Yamaguchi, and Shiro Imagama. "Indirect Decompression Using Lateral Lumbar Interbody Fusion for Restenosis after an Initial Decompression Surgery." Asian Spine Journal 14, no. 3 (June 30, 2020): 305–11. http://dx.doi.org/10.31616/asj.2019.0194.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
Study Design: Retrospective comparative study.Purpose: We compared clinical and radiographical outcomes after lumbar decompression revision surgery for restenosis by lateral lumbar interbody fusion (LLIF) and posterior lumbar interbody fusion (PLIF).Overview of Literature: Indirect lumbar decompression with LLIF was used to treat degenerative lumbar diseases requiring neural decompression. However, only a few studies have focused on the effectiveness of this technique for restenosis after lumbar decompression.Methods: We retrospectively investigated 52 cases involving lumbar interbody fusions for restenosis with spondylolisthesis after lumbar decompressions; these cases consisted of 15 patients who underwent indirect decompression with LLIF and posterior fixation and 37 patients who underwent the same procedure with PLIF. We compared Japanese Orthopaedic Association (JOA) scores and perioperative complications between groups. The cross-sectional areas of the thecal sac on magnetic resonance imaging were measured before, immediately after, and 2 years after surgery. We conducted statistical analyses using unpaired t -test and Fisher’s exact tests, and a <i>p</i> -value <0.05 was considered statistically significant.Results: The operative time was significantly shorter in the LLIF group than in the PLIF group (115.3±33.6 min vs. 186.2±34.2 min, respectively; <i>p</i> <0.001). In addition, the intraoperative blood loss was significantly lower in the LLIF group than in the PLIF group (58.2±32.7 mL vs. 303.2±140.1 mL, respectively; <i>p</i> <0.001). We found two cases of transient lateral thigh weakness (13.3%) in the LLIF group and five cases of incidental durotomy, one case of deep infection, and one case of neurological deterioration in the PLIF group—resulting in a higher complication incidence (18.9%), although it did not reach (<i>p</i> =0.63). The JOA scores improved significantly in both groups.Conclusions: Indirect decompression using LLIF provided acceptable clinical and radiographical outcomes in patients with restenosis with spondylolisthesis after lumbar decompression; no revision-surgery-specific complications were found. Our results suggest that LLIF is a safe and minimally invasive procedure for revision surgery.
5

Hanna, Amgad. "Transposition of the lateral femoral cutaneous nerve." Journal of Neurosurgery 130, no. 2 (February 2019): 496–501. http://dx.doi.org/10.3171/2017.8.jns171120.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
OBJECTIVEMeralgia paresthetica causes pain, burning, and loss of sensation in the anterolateral thigh. Surgical treatment traditionally involves neurolysis or neurectomy of the lateral femoral cutaneous nerve (LFCN). After studying and publishing data on the anatomical feasibility of LFCN transposition, the author presents here the first case series of patients who underwent LFCN transposition.METHODSNineteen patients with meralgia paresthetica were treated in the Department of Neurological Surgery at University of Wisconsin between 2011 and 2016; 4 patients underwent simple decompression, 5 deep decompression, and 10 medial transposition. Data were collected prospectively and analyzed retrospectively. No randomization was performed. The groups were compared in terms of pain scores (based on a numeric rating scale) and reoperation rates.RESULTSThe numeric rating scale scores dropped significantly in the deep-decompression (p = 0.148) and transposition (p < 0.0001) groups at both the 3- and 12-month follow-up. The reoperation rates were significantly lower in the deep-decompression and transposition groups (p = 0.0454) than in the medial transposition group.CONCLUSIONSBoth deep decompression and transposition of the LFCN provide better results than simple decompression. Medial transposition confers the advantage of mobilizing the nerve away from the anterior superior iliac spine, giving it a straighter and more relaxed course in a softer muscle bed.
6

Fayers, Tessa, Lucy E. Barker, David H. Verity, and Geoffrey E. Rose. "Oscillopsia after Lateral Wall Orbital Decompression." Ophthalmology 120, no. 9 (September 2013): 1920–23. http://dx.doi.org/10.1016/j.ophtha.2013.01.063.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
7

Wulc, Allan E., Jeffrey C. Popp, and Scott P. Bartlett. "Lateral Wall Advancement in Orbital Decompression." Ophthalmology 97, no. 10 (October 1990): 1358–69. http://dx.doi.org/10.1016/s0161-6420(90)32409-0.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
8

Jönsson, Bo, and Björn Strömqvist. "Decompression for Lateral Lumbar Spinal Stenosis." Spine 19, no. 21 (November 1994): 2381–86. http://dx.doi.org/10.1097/00007632-199411000-00001.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
9

Fiss, Ingo, Dorothee Mielke, Veit Rohde, Marios Psychogios, and Christoph Schilling. "Correlation between different instrumentation variants and the degree of destabilization in treating cervical spondylotic spinal canal stenosis by unilateral hemilaminectomy with bilateral decompression: a biomechanical investigation." European Spine Journal 30, no. 6 (March 10, 2021): 1529–35. http://dx.doi.org/10.1007/s00586-021-06773-9.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
Abstract Purpose Unilateral hemilaminectomy with bilateral decompression (BDZ) was proposed as an alternative decompressive procedure in cervical spondylotic myelopathy (CSM). Despite promising clinical results, the destabilizing effect is yet unknown. We therefore performed a biomechanical study to investigate whether lateral mass screw fixation should follow BDZ. Methods Six human C2–C7 cervical specimens were tested under various conditions: native, unilateral hemilaminectomy with bilateral decompression without/with fixation (BDZ/BDF), unilateral hemilaminectomy with bilateral decompression and unilateral foraminotomy without/with fixation (UFZ/UFF), unilateral hemilaminectomy with bilateral decompression and bilateral foraminotomy without/with fixation (BFZ/BFF), and laminectomy without/with fixation (LAZ/LAF). Instrumention was applied from C3–C6. For each condition, the three-dimensional kinematics of the cervical specimen were measured in three main loading directions with an ultrasonic motion analysis system. ANOVA was used to determine differences between the specific segment conditions to assess the parameter’s range of motion (ROM) and neutral zone (NZ). Results For flexion–extension, lateral bending and axial rotation, ROM of BDZ, UFZ, BFZ and LAZ remained at the level of the native condition (p > 0.74), whereas fixation reduced ROM significantly (p < 0.01). Between BDF, UFF, BFF and LAF, no significant differences in reduction in ROM were seen (p > 0.49). Results for NZ were equivalent to ROM in flexion–extension and lateral bending. For axial rotation, NZ remained almost constant on the native level for all tested conditions. Conclusion Bilateral decompression via a hemilaminectomy, even if combined with foraminotomy, could be a less invasive treatment option for multilevel CSM in patients with lordotic cervical alignment and absence of segmental instability.
10

Amorim, Marcela Maria de Almeida, Bruno Martins Araújo, and Eduardo Alberto Tudury. "Partial thoracolumbar lateral corpectomy in dogs and cats – review." Clínica Veterinária XXI, no. 120 (January 1, 2016): 76–88. http://dx.doi.org/10.46958/rcv.2016.xxi.n.120.p.76-88.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
Intervertebral disk disease is one of the most common neurological conditions in dogs; thoracolumbar disk is a usual cause of neurological dysfunction in this species. Several clinical and surgical treatments have been described, ranging from acupuncture and confinement to the use of anti-inflammatory, analgesic and muscle relaxant drugs, as well as the employment of varied surgical decompression techniques. The partial thoracolumbar lateral corpectomy is an alternative and effective surgical technique to treat chronic and acute thoracolumbar disk disease. It allows adequate access to the floor of the spinal canal for removal of disc material with minimal handling of the spinal cord, allowing wide and effective decompression. This review deals with anatomical, surgical and biomechanical aspects of this technique, and discusses its indications, advantages and disadvantages.

Дисертації з теми "Lateral decompression":

1

El, Damaty Ahmed [Verfasser]. "The Value of Lateral Spread Response Monitoring in Predicting the Clinical Outcome after Microvascular Decompression in Hemifacial Spasm: A Prospective Study on 100 patients. / Ahmed El Damaty." Greifswald : Universitätsbibliothek Greifswald, 2016. http://d-nb.info/1121111017/34.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
2

Zhang, Wang. "Contribution à l'étude expérimentale du comportement mécanique des argilites du Callovo-Oxfordien : effets du chemin de chargement et de la température." Thesis, Université de Lille (2018-2021), 2021. https://pepite-depot.univ-lille.fr/ToutIDP/EDENGSYS/2021/2021LILUN037.pdf.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
Les argilites du Callovo-Oxfordien (COx) sont étudiées depuis plusieurs décennies en France dans le contexte du stockage géologique des déchets radioactifs. Un grand nombre d'essais en laboratoire et d'expériences in-situ ont été réalisés pour la caractérisation du comportement thermo-hydromécanique à court et long terme ainsi que des propriétés de diffusion de gaz de cette roche argileuse. Cependant, certains aspects nécessitent encore des études complémentaires, entre autres, les effets du chemin de chargement et de la température sur les réponses mécaniques à court et long terme. Cette thèse apporte une nouvelle contribution aux travaux précédents sur ces aspects encore ouverts. Elle est composée de trois parties.Dans la première partie, l'influence du chemin de chargement sur le comportement mécanique à court terme des argilites du COx est considérée. Sur la base de l'analyse théorique du chemin de la contrainte autour d’une cavité souterraine, deux chemins de chargement particuliers avec deux valeurs différentes de l'angle de Lode sont sélectionnés, à savoir la décompression latérale et l'extension axiale avec une contrainte moyenne constante. Une série d’essais avec différentes valeurs de la contrainte moyenne est réalisée. Des cycles de déchargement-rechargement sont inclus dans les essais. Les résultats obtenus sont analysés et l'accent est mis sur les influences du chemin de chargement (angle de Lode) sur la résistance à la rupture et le processus d'endommagement induit.La deuxième partie est consacrée à l'étude de l'effet thermique sur le comportement mécanique à court terme des argilites du COx. Dans ce but, une série d'essais en laboratoire, avec les deux chemins de chargement (extension axiale et décompression latérale) et différentes valeurs de la température, sont réalisés. Sur la base des résultats obtenus, les effets de la température sur les propriétés élastiques et la résistance à la rupture sont discutés et mis en évidence pour les deux chemins de chargement.Dans la troisième partie, nous nous intéressons à l'effet du chemin de chargement et de la température sur le comportement mécanique à long terme des argilites COx. Une série d’essais de fluage est alors réalisée avec les deux chemins de chargement et différentes valeurs de la température. Les résultats obtenus sont analysés et discutés en mettant l'accent sur les influences du chemin de chargement et de la température sur la cinétique de déformation de fluage
Callovo-Oxfordian (COx) claystone has been investigated for several decades in France in the context of geological disposal of radioactive waste. A large number of laboratory tests and in-situ experiments have been conducted for the characterization of short and long thermo-hydromechanical behavior as well as gas flow diffusion property of this clayey rock. However, some aspects still need further investigation, among others, effects of loading paths and temperature on short and long-term mechanical responses. This thesis brings a new contribution to previous works on these open aspects. It is composed of three parts.In the first part, the influence of the loading path on the short-term mechanical behavior of COx claystone is considered. Based on theoretical analysis of stress path around the underground cavity, two particular loading paths with two different values of Lode angle are selected, namely lateral decompression and axial extension under constant mean stress. A series of tests with different values of mean stress are performed. Unloading-reloading cycles are involved in the tests. The obtained results are then analyzed and the emphasis is put on the influences of loading path (Lode angle) on the failure strength and induced damage process.The second part is devoted to studying the thermal effect on the short-term mechanical behavior of COx claystone. For this purpose, a series of laboratory tests, with both loading paths (axial extension and lateral decompression) and different values of temperature are performed. Based on the obtained results, the effects of temperature on the elastic property and failure strength are discussed for the two loading paths.In the third part, we are interested in investigating the effect of loading paths and temperature on the long-term mechanical behavior of COx claystone. A series of creep tests are then performed under two loading paths and with different values of temperature. The obtained test results are analyzed and discussed by putting the emphasis on the influences of loading path and temperature on creep deformation kinetics

Книги з теми "Lateral decompression":

1

Lyons, Daniel A., and David L. Brown. Tibial Neuropathy—Tarsal Tunnel Syndrome. Edited by Meghan E. Lark, Nasa Fujihara, and Kevin C. Chung. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780190617127.003.0010.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
Tarsal tunnel syndrome (TTS) is caused by compression of the tibial nerve and its branches within the tarsal tunnel at the ankle. The diagnosis of TTS is often made clinically, but imaging and electrodiagnostic studies should be considered when the diagnosis cannot be ascertained from the clinical history and physical examination. Surgical decompression of the tarsal tunnels should be pursued only after conservative measures have failed or when a space-occupying lesion or point of tibial nerve compression has been identified. Surgical intervention requires complete release of the flexor retinaculum at the medial ankle, as well as release of the three distinct tunnels enveloping the medial and lateral plantar nerves and the calcaneal branch. Success rates for tibial nerve decompression vary widely in the literature, ranging from 44% to 96%.

Частини книг з теми "Lateral decompression":

1

Goldberg, Robert Alan, and Milind N. Naik. "Lateral Wall Decompression." In Surgery in Thyroid Eye Disease, 127–36. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-32-9220-8_10.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
2

Lee, Yu-Po, and Vinko Zlomislic. "Indirect Decompression." In Lateral Access Minimally Invasive Spine Surgery, 289–95. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-28320-3_30.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
3

Rogerson, John S. "Arthroscopic Subacromial Decompression: Lateral Approach." In Advanced Arthroscopy, 17–27. New York, NY: Springer New York, 2001. http://dx.doi.org/10.1007/978-0-387-21541-9_2.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
4

Witiw, Christopher D., and Richard G. Fessler. "Thoracic Lateral Extracavitary Decompression and Fusion." In Essentials of Spinal Stabilization, 179–93. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-59713-3_16.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
5

Yamashita, Kazuta. "Full-Endoscopic Lateral Recess Decompression (Ventral Facetectomy)." In Transforaminal Full-Endoscopic Lumbar Surgery Under the Local Anesthesia, 63–67. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-7023-0_10.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
6

Nabavi, Cameron B., and Craig N. Czyz. "Orbit: Three-Wall (Medial, Floor, and Lateral) Decompression." In Operative Dictations in Ophthalmology, 387–91. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-45495-5_89.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
7

Nabavi, Cameron B., and Craig N. Czyz. "Orbit: Three-Wall (Medial, Floor, and Lateral) Decompression." In Operative Dictations in Ophthalmology, 555–59. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-53058-7_124.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
8

Sama, Andrew A. "Lateral Interbody Decompression and Fusion: Which Side to Approach From?" In Minimally Invasive Spinal Deformity Surgery, 245–53. Vienna: Springer Vienna, 2013. http://dx.doi.org/10.1007/978-3-7091-1407-0_25.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
9

Mayer, H. M. "Microsurgical Decompression of Acquired (Degenerative) Central and Lateral Spinal Canal Stenosis." In Minimally Invasive Spine Surgery, 105–16. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-662-08780-0_11.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
10

Apuzzo, Michael L. J. "Lumbar Laminotomy, Foraminotomy, Root Decompression, and Discectomy in the Lateral Position." In Surgical Approaches to the Spine, 323–29. New York, NY: Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4939-2465-3_47.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.

Тези доповідей конференцій з теми "Lateral decompression":

1

Bissell, Jorrdan N., Vadim Gospodarev, Kenneth M. De Los Reyes, and Promod Pillai. "Far Lateral Approach for Microvascular Decompression of Ectatic Vertebral Artery-Associated Medullary Compression." In 31st Annual Meeting North American Skull Base Society. Georg Thieme Verlag KG, 2022. http://dx.doi.org/10.1055/s-0042-1743927.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
2

Helal, Ahmed, Christopher Graffeo, Lucas Carlstrom, Fredric B. Meyer, Bruce Pollock, and Michael J. Link. "Lateral Spread Response Does Not Predict Long-Term Outcome after Microvascular Decompression for Hemifacial Spasm." In 31st Annual Meeting North American Skull Base Society. Georg Thieme Verlag KG, 2022. http://dx.doi.org/10.1055/s-0042-1743928.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
3

DiAngelo, Denis J., Bobby J. McVay, Kristine M. Olney, and Kevin T. Foley. "In Vitro Testing of Posterior Cervical Lateral Mass Plating Systems: Comparison of Constrained Versus Semi-Constrained Screw-Slot Connections." In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-2551.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
Abstract Interspinous or facet wiring has been the standard treatment for posterior cervical spine instability secondary to trauma or decompression (Wellmann et al., 1998). However, wire techniques may be limited when posterior elements are deficient or fractured. Alternative methods, such as posterior lateral mass plate fixation, may restore the stability of the affected region and promote fusion (Wellmann et al., 1998). The objective of the study was to determine if lateral mass plate fixation restored the stability of a reconstructed posterior destabilized cervical spine and to compare the biomechanical stability of two lateral mass plate designs: plates with screws constrained in slots (SCS) versus plates with screws unconstrained and free to translate in slots (SUS). Two posterior destabilized conditions were studied: a one-level (C4-C5) model and a two-level (C4-C6) model in which all posterior ligaments were sectioned.
4

Doobe, G., A. Ernst, I. Todt, and P. Mittmann. "Lateral Semicircular Canal Occlusion, Saccus Decompression And Cochlear Implantation: A New Approach For Refractory Menière's Disease And Functional Deafness." In Abstract- und Posterband – 89. Jahresversammlung der Deutschen Gesellschaft für HNO-Heilkunde, Kopf- und Hals-Chirurgie e.V., Bonn – Forschung heute – Zukunft morgen. Georg Thieme Verlag KG, 2018. http://dx.doi.org/10.1055/s-0038-1640294.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
5

Marlier, Re´gis, and Herve´ Issard. "New Metallic Gaskets Qualification: Resistance to Accident and Normal Conditions in TN International Casks." In 16th International Conference on Nuclear Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/icone16-48418.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
For dual purpose “transport/storage” casks (like the TN24 casks family or casks for vitrified wastes), the confinement by way of metallic gaskets has long been the chosen solution. Their metallic nature leading to a good behaviour in long-term and high temperature conditions, they still have to satisfy the transport regulations requirements, which are not a given. In order to secure the supplying of such strategic parts of a cask and, above all, to keep developing efficient sealing solutions, TN International has found and qualified new metallic gaskets. For this qualification, a series of tests complying with the accident and normal conditions of transport/storage have been designed and performed on these new metallic gaskets. Indeed, the gaskets have to withstand three major types of “accidental” conditions: 1/ parallel sliding of the lid and the body, resulting in a lateral displacement of the contact surfaces, 2/ separation of the lid and the body, resulting in a decompression of the gasket, 3/ 30 minutes-800°C fire on the cask, resulting in a peak temperature of the gasket. They also have to withstand normal transport/storage conditions, that is to say thermal ageing for long period. Finally we wanted to know how these seals resisted to small particles present during the compression. Tests assemblies and procedures have been developed, in accordance with TN International cask design. Then lateral quasi-static displacement tests up to 3-mm, lateral dynamic displacement tests up to 3-mm, multiple decompression and recompression tests, over-400°C peak temperature tests, long term ageing tests and particle-resistance tests were carried out. The dimensional, visual and leaktightness results of these conservative and highly severe tests were fully satisfactory and allow to establish the safety and efficiency of these new metallic gaskets.
6

Mitsuya, Masaki, Hiroyuki Motohashi, Noritake Oguchi, and Shuji Aihara. "Calculation of Dynamic Stress Intensity Factors for Pipes During Crack Propagation by Dynamic Finite Element Analysis." In 2012 9th International Pipeline Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/ipc2012-90205.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
A dynamic finite element analysis method was proposed for calculating the dynamic stress intensity factors for pipes during crack propagation. The proposed method can directly calculate the stress intensity factors without the simplification used in theoretical analyses, and it can consider the effects of the crack velocity and gas decompression. It was found that the stress intensity factors of long propagating cracks in pipes saturated at a certain value in the case of a high crack velocity. However, although the stress intensity factors for pipes were in good agreement with those of band plates in the case of a high crack velocity, the stress intensity factors for pipes were different from those of band plates in the case of a low crack velocity. This result could be explained by the effect of bulging on the stress distribution around a crack tip. The effect of bulging was more prominent for pipes with smaller diameters. In contrast, the dynamic stress intensity factors for band plates were in good agreement with the theoretical values that consider the dynamic effects and tended to decrease monotonically with increasing crack velocity. Additionally, the effects of gas decompression, caused by leakage from opened cracks, on the stress intensity factors for pipes were investigated. An explanation of crack deviation, which is observed in actual pipeline fractures, was provided by analyzing the ratio of the longitudinal stress to lateral stress.
7

Yuanyuan, Dong, and Luo Ying. "A Study on the Sealing Behaviors of the Laterally One Side Restrained C-Ring Under Internal Pressure by Numerical Simulation." In 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-66288.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
C-ring, which is one of the main sealing elements of Reactor Pressure Vessels, is composed of a close-wound helical spring surrounded by two metal linings. C-ring has better resilience and sealing characteristics. Just because of the complex structure of C-ring, it was studied by experiments almost. There were also some numerical simulations on C-ring. With these methods, the compression-decompression process of C-ring under ideal condition can be simulated. But them cannot be used to study the sealing behavior of laterally one side restrained C-ring under internal pressure, which is fit for practical condition. This paper will establish a 3D numerical simulation method to study the C-ring which is mentioned as above. In this paper, it can be obtained that with internal pressure forcing and sealing groove squeezing, sealing performance of C-ring will reduce; when p>20MPa, the ratio of reducing becomes bigger; when p>140MPa, it will generate leakage; inner lining and outer lining will generate biggish plastic deformation, while the stress distribution in spring changes much.
8

DiAngelo, Denis J., Keith A. Vossel, Kevin T. Foley, and Y. Raja Rampersaud. "Biomechanical Stability of Multi-Level Inter-Body Cervical Strut-Graft Fusion With Posterior Plating Instrumentation." In ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-0102.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
Abstract Strut-graft fusion with supplemental instrumentation is an accepted surgical treatment for multi-level cervical disease. There are many surgical methods for decompressing and reconstructing the cervical spine, e.g., anterior: multi-level discectomy, multi-level interbody strut-graft fusion (SG), multi-level strut-graft with anterior plate instrumentation, or posterior: multi-level laminectomy with posterior lateral mass plating instrumentation. A relatively new surgical approach that combines these methods is multi-level strut-graft fusion with posterior plating instrumentation (SGPP). Although the surgery should restore the mechanical integrity of the operated spine, little is known of the load-sharing mechanics between the SG and posterior instrumentation. Clinically, strut-grafted constructs fail by pistoning of the SG into the adjacent vertebrae, dislodgment of the SG at the vertebral interfaces, SG fracture, hardware breakage, or screw-plate extrusion. The objective of the study was to determine the biomechanical stability of SGPP spinal constructs and to study the influence of posterior plates on strut-graft loading mechanics in vitro.
9

Lim, Tae-Hong, Howard S. An, Young Do Koh, and Linda M. McGrady. "A Biomechanical Comparison Between Modern Anterior Versus Posterior Plate Fixation of Unstable Cervical Spine Injuries." In ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-0306.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
Abstract Unstable cervical spine injuries include flexion-distraction injuries with unilateral or bilateral facet dislocations and burst fracture of the vertebral body. These unstable injuries have been treated in various ways. For instance, various posterior fixation methods have been available, and particularly plating with lateral mass screws was proved to provide a rigid fixation. However, most cervical decompressions need to be performed anteriorly because the majority of compression is caused by either vertebral body retro-pulsion or herniated disc material (anterior structure). Anterior plating technique was recently introduced and employed for the surgical treatment of unstable injuries. Anterior plating is thought to offer an acceptable stability through a single surgical approach, but additional posterior fixation is frequently recommend to achieve a sufficient stability. There is a paucity of data on a direct biomechanical comparison of the stiffness provided by modern anterior, posterior, or combined plate-screw fixation in a human cadaveric cervical spine model. The purpose of this study was to compare the biomechanical characteristics of anterior vs posterior plating constructs and to evaluate the stiffness of a combined anterior-posterior fixation construct in a clinically simulated flexion-distraction injury and burst fracture models of the cervical spine.
10

Davudov, Davud, Rouzbeh Ghanbarnezhad Moghanloo, Younas Dadmohammadi, Mark Curtis, and Farzam Javadpour. "Impact of Pore Topology on Gas Diffusion and Productivity in Barnett and Haynesville Shale Plays." In ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/omae2016-54531.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
This study evaluates gas transport through matrix pores in Barnett and Haynesville shale gas plays. Gas is mainly stored in a compressed phase in small pores or as a desorbed phase on the surface of the pores. At the early stage of production, gas decompression/expansion within networks of large fractures connected directly to the wellbore is the dominant production mechanism; however, after some time (a couple of weeks up to few months) diffusive flux from the body of kerogen is triggered in response to the pressure drop realized at the fracture face. In this study we present a comprehensive study of the importance of various diffusion patterns to predict the productivity of shale reservoirs at the later stage of production. We present transient diffusion models to address gas diffusion from kerogen bodies through connected pores with different shapes (slit or cylindrical) toward fractures. In this model we use a new set of boundary conditions as opposed to traditional Dirichlet and Neumann types of boundary conditions. The analytical solution is validated using a set of experimental data. In the next step, we choose wells from gas producing parts of Barnett and Haynesville shale plays. Based on detailed studies of scanning electron microscope (SEM) images, we identified two different governing patterns for diffusive flux in the shale matrix: inter diffusion in Barnett and intra diffusion in Haynesville. We used production data to differentiate the matrix contribution using conventional methods of rate transient analysis. Using the analytical model, we compared the matrix contribution parts of production data between Barnett and Haynesville shale plays. We found an excellent match between observed small-scale pore shapes and field production data in our transient diffusion model. Based on results, the inter diffusion pattern provides greater flux; while everything else remains equal, Barnett wells benefit more from matrix contribution than those of Haynesville. Results indicate that the distribution of connected pores in the shale matrix has significant effect on the matrix contribution. The main contribution of this work is providing a transient flow model for gas transport through shale matrix accounting for the impacts of dominant shape of the connected pores and their abundance in the matrix texture (namely: organic or inorganic part). Our results suggest that the inter diffusion in Barnett shale play outperforms the intra diffusion mechanism in the Haynesville field. In addition, the more cylindrical pores, the better the performance. In general, the topology of the connected pores as well as their abundance within kerogen or inorganic matters can greatly influence long-term productivity of gas wells.

До бібліографії