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Accuracy of virtual rhinomanometry

Karbowski Krzysztof, Kopiczak Bartosz, Chrzan Robert, Gawlik Jolanta, Szaleniec Jolanta

Polish Journal of Medical Physics and Engineering

2023

Vol. 29, Iss. 1

59--72

Introduction: This paper describes the results of research aimed at developing a method of otolaryngological diagnosis based on computational fluid dynamics, which has been called Virtual Rhinomanometry. Material and methods: Laboratory studies of airflows through a 3D printed model of nasal cavities based on computed tomography image analysis have been performed. The CFD results have been compared with those of an examination of airflow through nasal cavities (rhinomanometry) of a group of 25 patients. Results: The possibilities of simplifying model geometry for CFD calculations have been described, the impact of CT image segmentation on geometric model accuracy and CFD simulation errors have been analysed, and recommendations for future research have been described. Conclusions: The measurement uncertainty of the nasal cavities’ walls has a significant impact on CFD simulations. The CFD simulations better approximate RMM results of patients after anemization, as the influence of the nasal mucosa on airflow is then reduced. A minor change in the geometry of the nasal cavities (within the range of reconstruction errors by CT image segmentation) has a major impact on the results of CFD simulations.

Biological Properties of Knitted Fabrics Used in Post-Burn Scar Rehabilitation

Latańska Ilona, Kowalski Krzysztof, Kłonowska Magdalena, Jaworska Aleksandra, Doś Janusz, Karbowski Krzysztof, Sujka Witold

Autex Research Journal

2022

Vol. 22, no. 3

343--349

Compression therapy along with the use of compression materials is one of the main prevention methods against scars and keloids. Compression knitted fabrics must be characterized by parameters that enabling to reaching class I compression (16–24 mmHg). When constant pressure higher than capillary vessels pressure is applied to scars, it will have a negative influence on formation of keloids and significantly prevents their hypertrophy. Long-term pressure causes tissue hypoxia, slowed-down metabolism, and reduction of the amount of fibroblasts. One of key elements of compression therapy is choosing the required knitted fabric with necessary structure and physicomechanical parameters as well as designing methodology based on Laplace law, which will ensure the application of desired value of single-unit pressure on post-burn scar. Apart from physicomechanical parameters, a medical device, such as compression garment, must be characterized by high level of biocompatibility. An added value in terms of functional parameters is the antibacterial action of the product. It was obtained from the fibers used which contain a compound in their matrix and out of which silver ions are released. Additionally, the antibacterial action was also obtained via impregnation of the knitted fabric in RUCO-BAC AGP which contains silver. In the course of the research presented in the article, compression fabric was designed with a special construction - a knitted fabric comprising two layers. The first layer, which is in direct contact with human skin, is manufactured out of a yarn with conductive-diffusive characteristics. The second layer is made of microfibers which keep the moisture out of skin surface and also diffuse it to the outside. The following article describes the final stage of developing a compression garment aiding the external treatment process; the mentioned stage is related to biological tests such as microbiological contamination, cytotoxicity, sensitization, and irritation. The article closes a series of publications presented by the Authors in bibliography. It also presents the antibacterial activity tests done on the developed double-layer knitted fabric enriched with silver. The obtained results suggest that the fabric may be used not only in compression therapy, but also in the field of cosmetics and aesthetics.

Comparison of Impact Resistance on a Knitted Prosthesis Based on Polypropylene and Acrylic Cements Based on Poly(methyl methacrylate)

Sujka Witold, Draczyński Zbigniew, Rutkowski Jacek, Karbowski Krzysztof, Gąsiorowski Tomasz, Kasprzak Piotr

Fibres & Textiles in Eastern Europe

2019

Vol. 27, no. 6 (138)

67--74

The aim of the study was to compare the physical and mechanical properties of known prostheses for cranioplasty: knitted Codubix based on polypropylene and Modela-cryl resin based on PMMA. It was expected that the study would allow to check whether it is possible to combine their properties, which should enable the preparation of a new material with properties combining the best features of both components. Physico-chemical and mechanical properties were evaluated. It was found that the two materials meet the requirements for chemical purity, ensuring the safety of their use. Regarding the mechanical properties, the energy of impact diffusion for two types of prostheses was determined applying the Drop Tower technique. The polymerisation heat of Modela-cryl resin was determined in real time using the DSC technique.

Celem pracy było porównanie właściwości fizycznych i mechanicznych znanych protez do kranioplastyki: dzianej Codubix na bazie polipropylenu i żywicy Modela-cryl na bazie PMMA. Oczekiwano, że badanie pozwoli sprawdzić, czy możliwe jest połączenie ich właściwości, co powinno pozwolić na przygotowanie nowego materiału o właściwościach łączących najlepsze cechy obu komponentów. Oceniono właściwości fizykochemiczne i mechaniczne. Stwierdzono, że oba materiały spełniają wymagania czystości chemicznej, zapewniając bezpieczeństwo ich stosowania. Jeśli chodzi o właściwości mechaniczne, określono energię dyfuzji uderzeniowej dla dwóch typów protez przy użyciu techniki Drop Tower. Określono ciepło polimeryzacji żywicy Modela-cryl w czasie rzeczywistym za pomocą techniki DSC.