Experimental and numerical analysis of urological stents

• Autorzy: Kajzer W. , Marciniak J.
• Języki publikacji: EN

Abstrakty

EN

Purpose: In order to evaluate the characteristic changes of the stents' diameters in function of the elongation (during elastic expansion) the biomechanical tests were carried out. The numerical analysis of the selected forms of urological stents was performed. The numerical results were compared with the experimental ones. Design/methodology/approach: The urethral stent commonly used in clinical practice was analyzed. Two types of research were carried out: experimental-in order to determine the displacement characteristic of the stent, and numerical (by means of the finite element method)-in order to evaluate stresses and strains in the stent. Findings: The comperative analysis of the obtained experimantal and numerical results showed good correlation, that proves the proper selection of the modeling conditions, and boundary conditions adequate to the real object. Research limitations/implications: The limitations were connected with the necessity of simplifications applied to the numerical model of the urological stent, and also with the difficulties caused by the established boundary conditions. Practical implications: The self-expanding stents analyzed in the work are implants for which the change of the diameter causes the significant change of the length. Due to the fact, the very important issue during implantation of this type of stent is the appropriate positioning in the narrowed part of urethra. The worked out characteristics allows to determine the length of the implant for the given diameter. Originality/value: The work presents the dispacement characteristics of the stent obtained on the basis of the experimental and numerical tests. The correlation of the obtained results is also presented.

Słowa kluczowe

EN

numerical techniques; biomechanical analysis

PL

techniki numeryczne; analiza biomechaniczna

• Wydawca: International OCSCO World Press
• Czasopismo: Archives of Materials Science and Engineering
• Rocznik: 2007
• Tom: Vol. 28, nr 5
• Strony: 297--300
• Opis fizyczny: Bibliogr. 19 poz., il., wykr.

Twórcy

autor

Kajzer W.

autor

Marciniak J.

• Division of Biomedical Engineering, Institute of Engineering Materials and Biomaterials, Silesian University of Technology, ul. Konarskiego 18a, 44-100 Gliwice, Poland,

Bibliografia

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• [7] W. Kajzer, M. Kaczmarek, A. Krauze, J. Marciniak, Surface modification and corrosion resistance of Ni-Ti alloy used for urological stents, Journal of Achievements in Materials and Manufacturing Engineering 20 (2007) 123-126.
• [8] W. Kajzer, W. Chrzanowski, J. Marciniak, Corrosion resistance of Cr-Ni-Mo steel intended for urological stents, Proceeding of the 11th International Scientific Conference on „Contemporary Achievements in Mechanics, Manufacturing and Materials Science” CAM3S, Gliwice-Zakopane, 2005, 444-449.
• [9] J. Marciniak, W. Chrzanowski, J. Żak, Structure modification of surface layer of Ti6Al4V ELI. Biomaterial Engineering 30-33 (2003) 56-58 (in Polish).
• [10] W. Chrzanowski, J. Marciniak, J. Szewczenko, G. Nawrat, Electrochemical modification of Ti6Al4V ELI surface, Proceeding of the 12th International Scientific Conference „Achievements in Mechanical and Materials Engineering AMME2003”, Gliwice-Zakopane, 2003, 157-160.
• [11] M. Kaczmarek, W. Simka, A. Baron, J. Szewczenko, J. Marciniak, Electrochemical behavior of Ni-Ti alloy after surface modification, Journal of Achievements in Material and Manufacturing Engineering 18 (2006) 111-114.
• [12] W. Kajzer, A. Krauze, W. Walke, J. Marciniak, Corrosion resistance of Cr-Ni-Mo steel in simulated body fluids, Journal of Achievements in Material and Manufacturing Engineering, 18 (2006) 115-118.
• [13] W. Kajzer, M. Kaczmarek, J. Marciniak, Biomechanical analysis of stent-oesophagus system. Journal of Materials Processing Technology 162-163 (2005) 196-202.
• [14] W. Walke, W. Kajzer, M. Kaczmarek, J. Marciniak, Stress and displacement analysis in conditions of coronary angioplasty, Proceedings of the 11th International Scientific Conference „Achievements in Mechanical and Materials Engineering” AMME2002, Gliwice-Zakopane, 2002, 595-600.
• [15] W. Walke, Z. Paszenda, J. Filipiak, Experimental and numerical biomechanical analysis of vascular stent, Journal of Materials Processing Technology 164-165, (2005) 1263-1268.
• [16] Standard ISO 5832-1: 1997/Ap1:1999. Implants for burgery. Metallic materials-Part 1: Wrought stainless steel.
• [17] Standard ISO 5832-6: 1994. Metallic materials. Part 7: Forgeable and cold-formed cobalt-chromium-nickelmolybdenum-iron alloy.
• [18] Standard ASTM F 1058: 2002. Standard Specification for Wrought 40 Cobalt-20 Chromium-16 Iron-15 Nickel-7 Molybdenum Alloy Wire and Strip for Surgical Implant Applications.
• [19] Standard ASTM F 2063: 2005. Standard Specification for Wrought Nikel-Titanium Shape Memory Alloys for medical Devices and Surgical Implants.