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  1. Article ; Online: Paediatric skull growth models: A systematic review of applications to normal skulls and craniosynostoses.

    Geoffroy, Maya / François, Pierre-Marc / Khonsari, Roman Hossein / Laporte, Sébastien

    Journal of stomatology, oral and maxillofacial surgery

    2022  Volume 123, Issue 5, Page(s) e533–e543

    Abstract: Introduction: Craniosynostoses affect 1/2000 births and their incidence is currently increasing. Without surgery, craniosynostosis can lead to neurological issues due to restrained brain growth and social stigma due to abnormal head shapes. ... ...

    Abstract Introduction: Craniosynostoses affect 1/2000 births and their incidence is currently increasing. Without surgery, craniosynostosis can lead to neurological issues due to restrained brain growth and social stigma due to abnormal head shapes. Understanding growth patterns is essential to develop surgical planning approaches and predict short- and long-term post-operative results. Here we provide a systematic review of normal and pathological cranial vault growth models.
    Material and methods: The systematic review of the literature identified descriptive and comprehensive skull growth models with the following criteria: full text articles dedicated to the skull vault of children under 2 years of age, without focus on molecular and cellular mechanisms. Models were analysed based on initial geometry, numerical method, age determination method and validation process.
    Results: A total of 14 articles including 17 models was reviewed. Four descriptive models were assessed, including 3 models using statistical analyses and 1 based on deformational methods. Thirteen comprehensive models were assessed including 7 finite element models and 6 diffusion models. Results from the current literature showed that successful models combined analyses of cranial vault shape and suture bone formation.
    Discussion: Growth modelling is central when assessing craniofacial architecture in young patients and will be a key factor in the development of future customized treatment strategies. Recurrent technical difficulties were encountered by most authors when generalizing a specific craniosynostosis model to all types of craniosynostoses, when assessing the role of the brain and when attempting to relate the age with different stages of growth.
    MeSH term(s) Child ; Cranial Sutures/pathology ; Craniosynostoses/diagnosis ; Craniosynostoses/epidemiology ; Craniosynostoses/etiology ; Head ; Humans ; Infant ; Postoperative Period ; Skull/surgery
    Language English
    Publishing date 2022-01-07
    Publishing country France
    Document type Journal Article ; Systematic Review ; Research Support, Non-U.S. Gov't
    ZDB-ID 2916276-2
    ISSN 2468-7855 ; 2468-8509
    ISSN (online) 2468-7855
    ISSN 2468-8509
    DOI 10.1016/j.jormas.2022.01.002
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Surface reconstruction from routine CT-scan shows large anatomical variations of falx cerebri and tentorium cerebelli.

    Staquet, Hélène / Francois, Pierre-Marc / Sandoz, Baptiste / Laporte, Sébastien / Decq, Philippe / Goutagny, Stéphane

    Acta neurochirurgica

    2020  Volume 163, Issue 3, Page(s) 607–613

    Abstract: Background: Finite element modeling of the human head offers an alternative to experimental methods in understanding the biomechanical response of the head in trauma brain injuries. Falx, tentorium, and their notches are important structures surrounding ...

    Abstract Background: Finite element modeling of the human head offers an alternative to experimental methods in understanding the biomechanical response of the head in trauma brain injuries. Falx, tentorium, and their notches are important structures surrounding the brain, and data about their anatomical variations are sparse.
    Objective: To describe and quantify anatomical variations of falx cerebri, tentorium cerebelli, and their notches.
    Methods: 3D reconstruction of falx and tentorium was performed by points identification on 40 brain CT-scans in a tailored Matlab program. A scatter plot was obtained for each subject, and 8 anatomical landmarks were selected. A reference frame was defined to determine the coordinates of landmarks. Segments and areas were computed. A reproducibility study was done.
    Results: The height of falx was 34.9 ± 3.9 mm and its surface area 56.5 ± 7.7 cm
    Conclusion: We observe large anatomical variations of falx, tentorium, and notches, crucial to better understand the biomechanics of brain injury, in personalized finite element models.
    MeSH term(s) Anatomic Variation ; Dura Mater/diagnostic imaging ; Humans ; Tomography, X-Ray Computed
    Language English
    Publishing date 2020-02-07
    Publishing country Austria
    Document type Journal Article
    ZDB-ID 80010-7
    ISSN 0942-0940 ; 0001-6268
    ISSN (online) 0942-0940
    ISSN 0001-6268
    DOI 10.1007/s00701-020-04256-2
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: 3D-printed shields for slit lamps produced during the COVID-19 pandemic.

    Delbarre, Maxime / François, Pierre-Marc / Adam, Jérémy / Caruhel, Jean-Baptiste / Froussart-Maille, Françoise / Khonsari, Roman Hossein

    Annals of 3D printed medicine

    2021  Volume 1, Page(s) 100004

    Abstract: Additive manufacturing has been extensively used during the COVID-19 pandemic to design and produce protection equipment. During clinical examinations using slit lamps, ophthalmologists are at risk of being contaminated by the SARS-CoV-2 virus, and the ... ...

    Abstract Additive manufacturing has been extensively used during the COVID-19 pandemic to design and produce protection equipment. During clinical examinations using slit lamps, ophthalmologists are at risk of being contaminated by the SARS-CoV-2 virus, and the device itself is exposed to viral contamination. Several solutions have already been proposed for fixing transparent shields on the physician side. Here we propose a 3D-printed device fixed on the chin rest on the patient side, aiming at limiting viral spread both on the lamp itself and towards the physician.
    Language English
    Publishing date 2021-03-19
    Publishing country France
    Document type Journal Article
    ISSN 2666-9641
    ISSN (online) 2666-9641
    DOI 10.1016/j.stlm.2020.100004
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Quality versus emergency: How good were ventilation fittings produced by additive manufacturing to address shortages during the COVID19 pandemic?

    Khonsari, Roman Hossein / Oranger, Mathilde / François, Pierre-Marc / Mendoza-Ruiz, Alexis / Leroux, Karl / Boussaid, Ghilas / Prieur, Delphine / Hodge, Jean-Pierre / Belle, Antoine / Midler, Vincent / Morelot-Panzini, Capucine / Patout, Maxime / Gonzalez-Bermejo, Jésus

    PloS one

    2022  Volume 17, Issue 4, Page(s) e0263808

    Abstract: Objective: The coronavirus disease pandemic (COVID-19) increased the risk of shortage in intensive care devices, including fittings with intentional leaks. 3D-printing has been used worldwide to produce missing devices. Here we provide key elements ... ...

    Abstract Objective: The coronavirus disease pandemic (COVID-19) increased the risk of shortage in intensive care devices, including fittings with intentional leaks. 3D-printing has been used worldwide to produce missing devices. Here we provide key elements towards better quality control of 3D-printed ventilation fittings in a context of sanitary crisis.
    Material and methods: Five 3D-printed designs were assessed for non-intentional (junctional and parietal) and intentional leaks: 4 fittings 3D-printed in-house using FDeposition Modelling (FDM), 1 FDM 3D-printed fitting provided by an independent maker, and 2 fittings 3D-printed in-house using Polyjet technology. Five industrial models were included as controls. Two values of wall thickness and the use of coating were tested for in-house FDM-printed devices.
    Results: Industrial and Polyjet-printed fittings had no parietal and junctional leaks, and satisfactory intentional leaks. In-house FDM-printed fittings had constant parietal leaks without coating, but this post-treatment method was efficient in controlling parietal sealing, even in devices with thinner walls (0.7 mm vs 2.3 mm). Nevertheless, the use of coating systematically induced absent or insufficient intentional leaks. Junctional leaks were constant with FDM-printed fittings but could be controlled using rubber junctions rather than usual rigid junctions. The properties of Polyjet-printed and FDM-printed fittings were stable over a period of 18 months.
    Conclusions: 3D-printing is a valid technology to produce ventilation devices but requires care in the choice of printing methods, raw materials, and post-treatment procedures. Even in a context of sanitary crisis, devices produced outside hospitals should be used only after professional quality control, with precise data available on printing protocols. The mechanical properties of ventilation devices are crucial for efficient ventilation, avoiding rebreathing of CO2, and preventing the dispersion of viral particles that can contaminate health professionals. Specific norms are still required to formalise quality control procedures for ventilation fittings, with the rise of 3D-printing initiatives and the perspective of new pandemics.
    MeSH term(s) COVID-19/epidemiology ; Critical Care ; Humans ; Pandemics/prevention & control ; Printing, Three-Dimensional ; Ventilation
    Language English
    Publishing date 2022-04-21
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2267670-3
    ISSN 1932-6203 ; 1932-6203
    ISSN (online) 1932-6203
    ISSN 1932-6203
    DOI 10.1371/journal.pone.0263808
    Database MEDical Literature Analysis and Retrieval System OnLINE

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