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A Numerical Evaluation of Electric Field and SAR Distribution Around a Titanium Implant in the Trunk of a Child

Miaskowski A., Olchowik G., Krawczyk A., Łada-Tondyra E., Bartosiński A.

Przegląd Elektrotechniczny

2012

R. 88, nr 12b

77-79

The paper presents a numerical evaluation of electric field and SAR distribution in the trunk of a 6-year-old boy. The analysis was done for two cases – a boy’s trunk with and without an implant. The electric field and SAR distribution were compared with regard to reference levels recommended by EU. The summary of results indicates that a conductive object in between tissues does not cause notable local enhancement both in the electric field and SAR distribution.

W artykule przedstawiono numeryczną analizę rozkładu pola elektrycznego i współczynnika SAR w tułowiu sześcioletniego chłopca. Analizę wykonano dla dwóch przypadków: model tułowia z implantem i bez niego. Uzyskane rozkłady pola elektrycznego i SARu odniesione zostały do norm rekomendowanych przez UE. Zaprezentowana analiza wykazała, że obecność implantu nie powoduje znaczących zmian w rozkładzie pola elektrycznego i SARu. (Numeryczna analiza rozkładu pola elektrycznego i SAR w tułowiu dziecka z tytanowym implantem).

Modification of surface films on chromium-nickel-molybdenum steel implants used in orthopaedics and traumatology

Marciniak J.

Journal of Achievements in Materials and Manufacturing Engineering

2010

Vol. 43, nr 1

108-116

Purpose: the paper is to characterize stainless steel of modyfied sufrace as a material used in orthopaedics and traumatology on the example of LCP (Locking Compression Plate) used in long bones treatment. Design/methodology/approach: In order to reach the goal biomechanical analyses, both numerical and experimental, were carried out. The results of the analyses are the basis for selecting geometrical features of a plate stabiliser and biomaterial mechanical properties. The degree of stress and deformation also determines areas where corrosion can start to develop. Chromium-nickel-molybdenum steel widely applied for making implants used in orthopaedics and traumatology was selected for testing implant surface modification. Passive and passive-carbon films were formed on the implants. The structure of the created films was tested together with their susceptibility to deformation and resistance to corrosion. Findings: It was shown that formation of passive-carbon DLC coatings is an effective method of increasing steel resistance to pitting, crevice and stress corrosion and of increasing its biocompatibility. Practical implications: The proposed surface treatment seems to be effective method that allow to reduce the risk of post-surgical complications. The coatings can be formed by using electrolytic polishing and passivation and a final RF PACVD process. Originality/value: The author also presents results of the coating surface topography examination, results of tests on its chemical and phase structure as well as mechanical and physicochemical properties.