Journal ArticleDOI
Corrosion resistance of Cr-Ni-Mo steel intended for urological stents
TLDR
In this paper, the influence of surface treatment and plastic strain of Cr-Ni-Mo stainless steel, intended for implants applied in urogenital surgery, on the steel's corrosion resistance was presented.Abstract:
This work presents the influence of the surface treatment and plastic strain of Cr-Ni-Mo stainless steel, intended for implants applied in urogenital surgery, on the steel's corrosion resistance. Tests were carried out in simulated urine at a temperature of 37 1C and pH = 66,4. In particular, pitting and crevice corrosion resistance tests were carried out. Furthermore, through the applied technique of stent implantation, the deformability of the passive layer was evaluated. The deformability tests of the passive layer were carried out with the use of a bend test followed by a corrosion test.read more
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Corrosion resistance of Cr-Ni-Mo steel in simulated body fluids
Abstract: Purpose: The paper presents the comparison of corrosion resistance of Cr-Ni-Mo stainless steel in various corrosive media simulating human body fluids. Design/methodology/approach: The corrosion tests were realized by recording of anodic polarization curves with the use of the potentiodynamic method. The VoltaLab® PGP 201 system for electrochemical tests was applied. The tests were carried out in electrolyte simulating urine (pH = 6 ÷ 6.4), Tyrode’s physiological solution (pH = 6.8 ÷ 7.4) and plasma (pH = 7.2 ÷ 7.6) at the temperature of 37±1°C. Findings: Surface condition of metallic biomaterial determines its corrosion resistance. The highest values of breakdown potentials are recorded for electropolished and chemically passivated samples tested in artificial urine. The lowest values of anodic current density were recorded for samples tested in Tyrode’s physiological solution. Research limitations/implications: The obtained results are the basis for the optimization of physicochemical properties of the metallic biomaterial. Practical implications: On the basis of the obtained results it can be stated that stainless steel can be applied in reconstruction surgery, operative cardiology and urology. Originality/value: The paper presents the influence of various corrosive media simulating human body fluids on corrosion resistance of Cr-Ni-Mo stainless steel.
Journal ArticleDOI
A shape memory stent of poly(ε-caprolactone-co-DL-lactide) copolymer for potential treatment of esophageal stenosis.
Xiongjun Yu,Lin Wang,Mao-Tao Huang,Tao Gong,Wenbing Li,Yaling Cao,Dai-Jin Ji,Ping Wang,Jing Wang,Shaobing Zhou +9 more
TL;DR: The primary animal experiment in vivo has revealed that the implanted deformed stent could be triggered by body temperature and expectedly returned to a nearly-round shape to support esophageal wall and may be great potential to displace the conventional metallic stents for the esophagal stenosis therapy.
Journal ArticleDOI
Recent advances in ureteral stents.
TL;DR: The conventional double-J stents and the concept of ureteral stenting is undergoing several changes, and new generation stents will allow the physician to choose better-fitting stents according to the needs of the individual patient.
Book ChapterDOI
EIS Study of SiO2 Oxide Film on 316L Stainless Steel for Cardiac Implants
TL;DR: In this article, the authors proposed to form a silica layer of the established technological parameters on surface of the 316L stainless steel, in order to determine the usefulness of this technology electrochemical impedance spectroscopy studies were performed.
Journal Article
Influence of cold rolling on the corrosion resistance of austenitic steel
A. Kurc,M. Kciuk,Marcin Basiaga +2 more
TL;DR: In this article, the effects of plastic deformation in cold working process on the corrosion resistance, micro-hardness and mechanical properties of austenitic stainless steel X5CrNi18-10 were analyzed using weight and potentiodynamic methods.
References
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Journal ArticleDOI
Urolume endourethral prosthesis for the treatment of urethral stricture disease: Long-term results of the North American multicenter urolume trial
TL;DR: Clinically and statistically significant results were seen at 1 year and sustained at 2 years, and the UroLume endourethral prosthesis offers a significant advantage over the currently available treatments for recurrent bulbar urethral strictures.
Journal ArticleDOI
Experimental and numerical biomechanical analysis of vascular stent
TL;DR: In this paper, a vascular stent used in a treatment of blood vessel stenosis was determined, and the biomechanical characteristic of the stent was determined using a model of the blood vessel.
Journal ArticleDOI
Metal Stents: A New Treatment of Malignant Ureteral Obstruction
George A. Barbalias,Dimitrios Siablis,Evangelos Liatsikos,Dimitrios Karnabatidis,Spiridon Yarmenitis,Konstantinos Bouropoulos,John Dimopoulos +6 more
TL;DR: Implantation of a metal self-expandable or balloon expanding stent is safe and effective for the palliative treatment of malignant ureteral obstruction in late stage cancer patients.
Journal ArticleDOI
Biomechanical analysis of stent–oesophagus system
TL;DR: In this article, the biomechanical analysis of a stent-oesophagus system was presented, in particular, stresses and strains for the oesophageal stent (Z-type) reflecting its implantation technique were calculated.
Journal ArticleDOI
Corrosion resistance of intramedullary nails used in elastic osteosynthesis of children
TL;DR: In this paper, the corrosion resistance of intramedullary nails made of the 316 l stainless steel was evaluated for three groups of implants with different time of implantation and surface damage.