Wyniki wyszukiwania - BazTech

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Evaluation of mandibular geometry in healthy children aged 0-1 year - a pilot study

Lipowicz Anna, Kawlewska Edyta, Larysz Dawid, Kostyra Patrycja, Graja Katarzyna, Joszko Kamil, Gzik-Zroska Bożena, Wolański Wojciech

Acta of Bioengineering and Biomechanics

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2023

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Vol. 25, no. 3

EN

The main aim of the researches was the three-dimensional morphological assessment of the mandible in children. Materials&Methods: The research group consisted of 34 infants from 21 to 417 days of age (0-13 months). Models of the mandibles were developed on the basis of tomographic images. Characteristic anatomical points were marked on the models, on the basis of which characteristic distances and angles were calculated, determining the length, width and height of the mandible as well as its proportion and symmetry. Based on the obtained database, models of mandibular growth in the first year of life in three directions were also developed. Conclusion: The analysis of the results revealed some significant objective information on the growth and development of the normal mandible.

2

Evaluation of the strength properties of materials intended for tracheobronchial tubes

Sobota Robert, Markowski Jarosław, Joszko Kamil, Gzik-Zroska Bożena, Kawlewska Edyta, Gzik Marek

Engineering of Biomaterials

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2020

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Vol. 23, no. 156

10--16

EN

The desire to increase the comfort of patients and to continue production despite the decreasing amount of available materials on the market has led to the constant search for novel materials that could be used to obtain tracheobronchial tubes. The aim of this study is to determine the mechanical properties of a new thermoplastic elastomer. Two materials - the thermoplastic elastomer and the natural rubber were subjected to three tests: static tensile test, static compression test and static three-point bending test. During the static tensile test, samples of the tested materials were examined, and during the next two examinations, the final products. The materials underwent the processes of sterilization, hydrolytic degradation and degradation by oxidation. The treated samples were also tested in order to compare the obtained results. The mechanical properties of the tested materials improved both after the hydrolytic degradation and oxidative degradation, as well as after the sterilization process. Yet the thermoplastic elastomer revealed a more noticeable increase. The elastomer hardening is a positive phenomenon potentially leading to fewer accidental closures of the tubes cross-section. Both the sterilization process and various degradation methods improved the mechanical properties by strengthening the tested materials. This phenomenon seems to be desirable to avoid the closure of the implemented tube during its application.

3

Finite element head model for the crew injury assessment in a light armoured vehicle

Burkacki Michał, Wolański Wojciech, Suchoń Sławomir, Joszko Kamil, Gzik-Zroska Bożena, Sybilski Kamil, Gzik Marek

Acta of Bioengineering and Biomechanics

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2020

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Vol. 22, no. 2

173--183

EN

Purpose: The aim of this paper was the development of a finite element model of the soldier’s head to assess injuries suffered by soldiers during blast under a light armoured vehicle. Methods: The application of a multibody wheeled armoured vehicle model, including the crew and their equipment, aenabled the researchers to analyse the most dangerous scenarios of the head injury. These scenarios have been selected for a detailed analysis using the finite element head model which allowed for the examination of dynamic effects on individual head structures. In this paper, the authors described stages of the development of the anatomical finite element head model. Results: The results of the simulations made it possible to assess parameters determining the head injury of the soldier during the IED explosion. The developed model allows the determination of the parameters of stress, strain and pressure acting on the structures of the human head. Conclusion: In future studies, the model will be used to carry out simulations which will improve the construction of the headgear in order to minimize the possibility of the head injury.

4

Ocena właściwości wytrzymałościowych materiałów na rurki tracheostomijne

Sobota Robert, Joszko Kamil, Gzik-Zroska Bożena, Markowski Jarosław, Kawlewska Edyta

Aktualne Problemy Biomechaniki

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2019

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z. 18

47--53

PL

W pracy przedstawiono wyniki badań wytrzymałościowych materiału wykorzystywanego do produkcji rurek tracheostomijnych oraz dwóch materiałów, przewidzianych do ich produkcji w nowej technologii wywarzania. Przebadano trzy materiały (polietylen małej gęstości przeznaczonego do wytłaczania - polietylen nr 2 oraz dwóch polietylenów małej gęstości przeznaczonych do przetwarzania za pomocą procesu wtrysku - polietylen nr 1 oraz polietylen nr 3) dla których wyznaczono maksymalną siłę zginającą i ściskającą oraz maksymalne naprężenia. Uzyskane wyniki badań poddano analizie w celu poszukiwania optymalnego materiału wykorzystywanego w procesie produkcyjnym.

EN

The paper presents the results of strength tests of the material used for the production of tracheostomy tubes and two materials intended for their production in the new manufacturing technology. Three materials (low density polyethylene intended for extrusion - polyethylene No. 2 and two low density polyethylenes intended for injection molding - polyethylene No. 1 and polyethylene No. 3) were tested for which the maximum bending and compressive force and maximum stress were determined. The obtained test results were analyzed in order to search for the optimal material used in the production process.