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  • 1
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    Online Resource
    Evaluation of konjac noodle as a microsurgery training model: learning curve analysis
    FapUNIFESP (SciELO) ; 2023
    In:  Revista do Colégio Brasileiro de Cirurgiões Vol. 50 ( 2023)
    Details
    In: Revista do Colégio Brasileiro de Cirurgiões, FapUNIFESP (SciELO), Vol. 50 ( 2023)
    Abstract: ABSTRACT Introdução: modelos tradicionais de treinamento de anastomose microcirúrgica costumam ter custos elevados e implicações éticas de aquisição e manutenção, buscando-se alternativas que reúnam baixo custo e facilidade de armazenamento. Existem diferentes propostas, porém há poucas evidências de que conhecimentos adquiridos com o treinamento nessas plataformas se traduza em melhora na performance, quando estes são comparados a modelos consagrados. Este projeto objetiva avaliar a viabilidade do macarrão de konjac como modelo confiável de treinamento microcirúrgico. Métodos: 10 residentes de neurocirurgia realizaram uma anastomose término-terminal em artéria placentária humana de 2-3mm. As anastomoses foram avaliadas quantitativamente, registrando-se o tempo de confecção e qualitativamente, aplicando-se um escore validado (Anastomosis Lapse Index – ALI) por neurocirurgiões experientes e verificando-se a presença de vazamento grosseiro através da visualização no modo fluorescente injetando-se fluoresceína. Subsequentemente, realizaram 10 sessões de treinamento não consecutivos de anastomose términoterminal no modelo de konjac. Por fim, uma anastomose final foi realizada no modelo placentário e os mesmo parâmetros reavaliados. Resultados: observamos uma redução de 17 min no tempo médio de confecção da anastomose no modelo de placenta após os treinos no modelo do macarrão (p 〈 0.05). Houve uma redução não significativa de 20% no vazamento grosseiro. As sessões de treino no macarrão não foram capazes de melhorar consistentemente o score ALI. Conclusão: o treinamento em modelo de macarrão konjac é capaz de reduzir o tempo para realização das anastomoses no modelo em placenta humana, mostrando-se alternativa viável de baixo custo e manutenção, útil em serviços que disponham de microscópio apenas no ambiente cirúrgico.
    Type of Medium: Online Resource
    ISSN: 1809-4546 , 0100-6991
    Uniform Title: Avaliação do uso de macarrão japonês para treinamento microcirúrgico: análise objetiva da melhora na performance
    URL: Article
    DOI: 10.1590/0100-6991e-20233528-en
    Language: English , Portuguese
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2023
    detail.hit.zdb_id: 2223714-8
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  • 2
    Online Resource
    Online Resource
    Avaliação do uso de macarrão japonês para treinamento microcirúrgico: análise objetiva da melhora na performance
    FapUNIFESP (SciELO) ; 2023
    In:  Revista do Colégio Brasileiro de Cirurgiões Vol. 50 ( 2023)
    Details
    In: Revista do Colégio Brasileiro de Cirurgiões, FapUNIFESP (SciELO), Vol. 50 ( 2023)
    Abstract: ABSTRACT Background: classical models of microsurgical anastomosis training are expensive and have ethical implications. Some alternatives join low cost and easiness to store. However, the translation of knowledge acquired by training in these methods into the traditional ones is not clear. This project aims to assess the feasibility of konjac noodles as a reliable microsurgery-training model. Methods: 10 neurosurgery residents performed an end-to-end anastomosis in a 2-3mm placenta artery. The anastomoses were evaluated quantitatively, recording time; and qualitatively, applying a validated score (Anastomosis Lapse Index - ALI) by three experienced neurosurgeons and verifying the presence of gross leakage through the infusion of fluorescein. Subsequently, they performed 10 non-consecutive sessions of anastomosis training in the konjac noodle. Eventually, a final anastomosis in the placenta model was performed and the same parameters were scored. Results: we observed a 17min reduction in the mean time to perform the anastomosis in the placenta model after the training in the konjac (p 〈 0.05). There was a non-significant 20% reduction in gross leakage, but the training sessions were not able to consistently improve the ALI score. Conclusions: we demonstrate a reduction in anastomosis performing time in placental arteries after training sessions in the konjac noodle model, which can be regarded as a feasible low-cost method, particularly useful in centers with surgical microscopes only in the operation room.
    Type of Medium: Online Resource
    ISSN: 1809-4546 , 0100-6991
    Uniform Title: Evaluation of konjac noodle as a microsurgery training model: learning curve analysis
    URL: Article
    DOI: 10.1590/0100-6991e-20233528
    Language: Portuguese , English
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2023
    detail.hit.zdb_id: 2223714-8
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  • 3
    Online Resource
    Online Resource
    Caracterização metalográfica e mecânica do aço ABNT/SAE 1020 submetido ao tratamento termoquímico de cementação e ao tratamento térmico de têmpera
    FapUNIFESP (SciELO) ; 2022
    In:  Matéria (Rio de Janeiro) Vol. 27, No. 2 ( 2022)
    Details
    In: Matéria (Rio de Janeiro), FapUNIFESP (SciELO), Vol. 27, No. 2 ( 2022)
    Abstract: ABSTRACT The use of steel heat treatments aims to improve the mechanical performance of these materials during their application. In this context, solid cementation is a thermochemical treatment that makes it possible to increase the hardness on metal surfaces, through the diffusion of carbon from the atmosphere of an oven to the metal surface. On the other hand, quenching is a heat treatment that aims to increase the hardness of the steel, by heating the metal until austenitization and subsequent rapid cooling, forming a predominantly martensitic microstructure. The objective of the present work was to characterize the microstructures formed after the application of the quenching and solid carburizing of ABNT/SAE 1020 steels, using metallographic techniques and hardness tests. After carrying out the treatments, the samples were analyzed using Rockwell hardness tests, Vickers microhardness tests, and by optical microscopy and macrography. The results of the sample hardness tests showed that the hardness of the carburized and quenched samples is superior to the hardness of the untreated samples. In addition, there was no significant influence of the granulometry of charcoal on the hardness of the carburized samples, due to the high variability of the hardness values obtained. Through the optical microscopy and the results obtained in the Vickers microhardness tests, it was possible to notice that the carburized samples showed a great increase in the hardness of the region of the carburized layer, caused by the formation of high and low carbon martensite, with a more tenacious due to the presence of ferrite and pearlite. The quenched samples presented a low hardness microstructure, which was also verified by the microhardness test.
    Type of Medium: Online Resource
    ISSN: 1517-7076
    Uniform Title: Metallographic and mechanical characterization of ABNT/SAE 1020 steel subjected to the thermochemical treatment of carburizing and the thermal treatment of the quenching
    URL: Article
    DOI: 10.1590/s1517-707620220002.1328
    Language: Portuguese , English
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2022
    detail.hit.zdb_id: 2715822-6
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  • 4
    Online Resource
    Online Resource
    Análise de falhas de um gerador de vapor usando as ferramentas FMEA e FTA
    FapUNIFESP (SciELO) ; 2021
    In:  Matéria (Rio de Janeiro) Vol. 26, No. 1 ( 2021)
    Details
    In: Matéria (Rio de Janeiro), FapUNIFESP (SciELO), Vol. 26, No. 1 ( 2021)
    Abstract: ABSTRACT The structural health of a steam generator can be affected by several factors, such as the type of material of the structure, the quality of weld joints made, the boiler manufacturing parameters and the operating procedures performed. In this context, corrosion stands out as one of the major sources of degradation and can lead a surface under pressure to complete collapse. In this study, a failure analysis was made to investigate the process that lead to rupture and corrosion in a steam generator, using FMEA (Failure Mode and Effects Analysis) and FTA (Fault Tree Analysis) techniques. Metallographic tests of structure and a physicochemical study of the system feed water were also analysed. The metallographic tests showed small cracks in the base metal, in addition to lack of penetration in the welded joint and a misalignment of the joint. Water analysis showed a high concentration of chloride ions and a low pH of the feedwater, factors that cause the rupture of the passive layer and result in corrosion. The FMEA and FTA techniques allowed the understanding of the factors that act as stress concentrators, associated with lower quality of the steam generator feed water and errors during the welding process, which resulted in localized corrosion followed by rupture and leakage of liquid and steam water.
    Type of Medium: Online Resource
    ISSN: 1517-7076
    URL: Article
    DOI: 10.1590/s1517-707620210001.1230
    Language: Portuguese
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2021
    detail.hit.zdb_id: 2715822-6
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