scholarly journals MODELLING OF BONE FIXATION PLATE FROM BIODEGRADABLE MAGNESIUM ALLOY / KAULŲ LŪŽIŲ FIKSAVIMO PLOKŠTELIŲ IŠ BIODEGRADUOJANČIO MAGNIO LYDINIO MODELIAVIMAS

2019 ◽  
Vol 11 (0) ◽  
pp. 1-6 ◽  
Author(s):  
Andžela Šešok ◽  
Mindaugas Vaitiekūnas
Keyword(s):  
Stainless Steel ◽  
Titanium Alloy ◽  
Magnesium Alloy ◽  
The Body ◽  
Bone Tissue Regeneration ◽  
Biodegradable Materials ◽  
Stainless Steel 316L ◽  
Element Analysis ◽  
Alloy Plate ◽  
Alloy We43

Biodegradable materials are used in two key sectors of orthopaedics – to fabricate bone fixators and scaffolds for bone tissue regeneration. In case of osteosynthesis, fixators made from biodegradable materials disappear from the body after a certain time. So, a necessity of a one more operation for their removal is excluded. In the present study, the acromioclavicular joint osteosynthesis plates made of magnesium alloy (WE43), titanium alloy (Ti-6Al-7Nb) and stainless steel (316L) are compared utilizing the finite element analysis. The research showed that stresses in the magnesium alloy plate were lower, compared to the titanium alloy plate or the stainless steel plate. However, the tensile strength of magnesium is over 2 times lower, as compared to stainless steel and 5 times lower, than titanium alloys. Magnesium alloy is not suitable for manufacturing plates with low thickness (2 and 2.5 mm), because the stresses generated in them exceed the yield strength of the material.

scholarly journals Corrosion and Corrosion Fatigue Properties of Additively Manufactured Magnesium Alloy WE43 in Comparison to Titanium Alloy Ti-6Al-4V in Physiological Environment

Materials ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 2892 ◽  
Author(s):  
Nils Wegner ◽  
Daniel Kotzem ◽  
Yvonne Wessarges ◽  
Nicole Emminghaus ◽  
Christian Hoff ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Fatigue Strength ◽  
Magnesium Alloy ◽  
Corrosion Fatigue ◽  
Fatigue Properties ◽  
Test Duration ◽  
Medical Sector ◽  
Manufacturing Techniques ◽  
Alloy We43 ◽  
Application Fields

Laser powder bed fusion (L-PBF) of metals enables the manufacturing of highly complex geometries which opens new application fields in the medical sector, especially with regard to personalized implants. In comparison to conventional manufacturing techniques, L-PBF causes different microstructures, and thus, new challenges arise. The main objective of this work is to investigate the influence of different manufacturing parameters of the L-PBF process on the microstructure, process-induced porosity, as well as corrosion fatigue properties of the magnesium alloy WE43 and as a reference on the titanium alloy Ti-6Al-4V. In particular, the investigated magnesium alloy WE43 showed a strong process parameter dependence in terms of porosity (size and distribution), microstructure, corrosion rates, and corrosion fatigue properties. Cyclic tests with increased test duration caused an especially high decrease in fatigue strength for magnesium alloy WE43. It can be demonstrated that, due to high process-induced surface roughness, which supports locally intensified corrosion, multiple crack initiation sites are present, which is one of the main reasons for the drastic decrease in fatigue strength.

scholarly journals Dip-Coating of Calcium Hydroxyapatite on Titanium Alloy (ti-6ai-4v) and Stainless Steel (316L) Substrates

1999 ◽  
Vol 599 ◽  
Author(s):  
B. Mavis ◽  
A. C. Tas
Keyword(s):  
Stainless Steel ◽  
Titanium Alloy ◽  
Calcium Hydroxyapatite ◽  
Dip Coating ◽  
Orthopaedic Implants ◽  
Stainless Steel 316L ◽  
Metal Implants ◽  
Ha Coating ◽  
Sample Characterization

AbstractTitanium alloy (Ti-6AI-4V) and stainless steel (316L) are two of the most commonly used materials in the manufacture of orthopaedic implants. To achieve better biocompatibility with bone, metal implants made of 316L or Ti-6Al-4V are often coated with calcium hydroxyapatite (HA) bioceramics. This paper is to describe a new dipping solution recipe used for HA coating. Sample characterization was performed by SEM and XRD.

scholarly journals Osteogenesis and degradation behavior of magnesium alloy plate in vivo

2021 ◽  
Vol 19 ◽  
pp. 205873922110340
Author(s):  
Yongping Wang ◽  
Wenqiang Liang ◽  
Xiaorong Liu ◽  
Qiangqiang Li ◽  
Yadong Xie ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Magnesium Alloy ◽  
Control Group ◽  
Degradation Behavior ◽  
Alloy Plate ◽  
Plate Group ◽  
Titanium Alloy Plate ◽  
And Control ◽  
Experimental Group

Introduction: The magnesium alloy was fabricated into orthopedic plates, and used to repair tibial fractures of New Zealand white rabbits. The osteogenesis and degradation behavior of magnesium alloy plates were investigated in vivo. Methods: 38 rabbits were randomly divided into an experimental group using the magnesium alloy plate and control group using a titanium alloy plate. Tibial fractures in the experimental group and control group were fixed with magnesium alloy plates and titanium alloy plates, respectively. An X-ray of the fracture site was taken at 1, 2, 4, 8, and 16 weeks after surgery. The formation of callus and expression of bone morphogenetic protein (BMP-2) in each group were examined at 4, 8, and 16 weeks postoperatively. The degradation behavior of the magnesium alloy plate was observed using a scanning electron microscope with an energy dispersive spectroscopy system. Results: The results of X-ray showed that the fracture healed gradually and there was significant callus around the plate in the magnesium alloy plate group than that in the titanium alloy plate groups. The formation of callus and the expression of BMP-2 in the magnesium alloy plate group were more significant than that in the titanium plate group. The degradation behavior of the magnesium alloy plates deepened in vivo with the implantation time. Conclusion: The results demonstrated that the magnesium alloy plate implanted into the rabbit tibia could promote the formation of callus and result in osteogenesis in vivo. Meanwhile, the magnesium alloy plate was absorbed gradually in vivo.

Computational Modeling of the Mechanical Performance of a Magnesium Stent Undergoing Uniform and Pitting Corrosion in a Remodeling Artery

2017 ◽  
Vol 11 (2) ◽  
Author(s):  
Enda L. Boland ◽  
James A. Grogan ◽  
Peter E. McHugh
Keyword(s):  
Magnesium Alloy ◽  
Computational Modeling ◽  
Pitting Corrosion ◽  
Mechanical Performance ◽  
Formation Rate ◽  
The Body ◽  
Neointimal Formation ◽  
Modeling Framework ◽  
Element Analysis ◽  
Biodegradable Stents

Coronary stents made from degradable biomaterials such as magnesium alloy are an emerging technology in the treatment of coronary artery disease. Biodegradable stents provide mechanical support to the artery during the initial scaffolding period after which the artery will have remodeled. The subsequent resorption of the stent biomaterial by the body has potential to reduce the risk associated with long-term placement of these devices, such as in-stent restenosis, late stent thrombosis, and fatigue fracture. Computational modeling such as finite-element analysis has proven to be an extremely useful tool in the continued design and development of these medical devices. What is lacking in computational modeling literature is the representation of the active response of the arterial tissue in the weeks and months following stent implantation, i.e., neointimal remodeling. The phenomenon of neointimal remodeling is particularly interesting and significant in the case of biodegradable stents, when both stent degradation and neointimal remodeling can occur simultaneously, presenting the possibility of a mechanical interaction and transfer of load between the degrading stent and the remodeling artery. In this paper, a computational modeling framework is developed that combines magnesium alloy degradation and neointimal remodeling, which is capable of simulating both uniform (best case) and localized pitting (realistic) stent corrosion in a remodeling artery. The framework is used to evaluate the effects of the neointima on the mechanics of the stent, when the stent is undergoing uniform or pitting corrosion, and to assess the effects of the neointimal formation rate relative to the overall stent degradation rate (for both uniform and pitting conditions).

INVESTIGATING BIOMECHANICS OF DIFFERENT MATERIALS AND ANGLES OF BLADES OF FORCEPS FOR OPERATIVE DELIVERY BY FINITE ELEMENT ANALYSIS

2016 ◽  
Vol 16 (04) ◽  
pp. 1650046 ◽  
Author(s):  
KUO-MIN SU ◽  
MU-HSIEN YU ◽  
HER-YOUNG SU ◽  
YU-CHI WANG ◽  
KUO-CHIH SU
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stainless Steel ◽  
Titanium Alloy ◽  
Vaginal Delivery ◽  
Medical Equipment ◽  
Biomechanical Analysis ◽  
Operative Delivery ◽  
Excessive Force ◽  
Element Analysis

Using of forceps during labors and vaginal delivery accomplished operative deliveries in some circumstances. Forceps may induce fractures in the neonatal skull if excessive force is applied to it during an operative delivery. Therefore, newborns may be affected by forceps. The aim of this study was to investigate the effects of different curve angles and materials of the blades of forceps on neonates during labor or delivery for gynecologists and obstetricians using a finite element analysis (FEA). Computer models of the forceps, neonate’s scalp, and skull, were generated for the FEA. Moreover, the use of different materials (stainless steel and titanium alloy) and three different angles of the blades of forceps (20[Formula: see text], 40[Formula: see text], and 60[Formula: see text]) on a newborn’s head were simulated in a biomechanical analysis. The results indicate that a larger curve angle of the blades of forceps can decrease the stress and pressure on the neck of the newborn but may lead to rotation toward the posterior side. Moreover, forceps made of a lower Young’s modulus material can also reduce the stress and pressure on the neck of the newborn. It is hoped that this research can provide a more reasonable reference for manufacturers to design better medical equipment such as forceps in the future for obstetricians and gynecologists to use to attenuate the stress and pressure on the neck of a newborn.

Finite Element Analysis to Improve the Accuracy of Parts Made by Stainless Steel 316L Material Using Selective Laser Melting Technology

2014 ◽  
Vol 657 ◽  
pp. 236-240 ◽  
Author(s):  
Razvan Păcurar ◽  
Ancuţa Păcurar
Keyword(s):  
Finite Element ◽  
Stainless Steel ◽  
Selective Laser Melting ◽  
Thermal Stresses ◽  
Melting Process ◽  
Optimum Process ◽  
Stainless Steel 316L ◽  
Laser Melting ◽  
Element Analysis ◽  
Bed Temperature

One of the serious problems in the SLM process, using metallic powders is the thermal distortion of the model during forming. As a result of the locally concentrated energy input, the temperature gradient mechanism and the related processes lead to residual stresses and part deformations. Since the solidified part is cooled rapidly, the model tends to be deformed and cracked due to the thermal stresses. All these aspects were considered for a series of analyses that were made using the finite element method in order to determine the optimum process parameters (laser power, scanning speed, powder bed temperature) that are required in order to improve the accuracy of the metallic parts made by Stainless Steel 316L material using the Selective Laser Melting process.

scholarly journals PERANCANGAN DAN PEMBUATAN PROTOTYPE SHANK PROSTHESES KAKI BAGIAN BAWAH LUTUT

2017 ◽  
Vol 8 (2) ◽  
pp. 27
Author(s):  
Agung Prakoso
Keyword(s):  
Stainless Steel ◽  
Human Body ◽  
Daily Activity ◽  
High Growth ◽  
The Body ◽  
Daily Activities ◽  
Average Weight ◽  
Stainless Steel 316L ◽  
Below The Knee ◽  
Design And Manufacture

The existence o f fe e t as the part of the human body is very important to support the daily activities which is to support the body and to walk. The lost of the under knee part (amputation) is the dominant case of the total cases of amputation in Indonesia. So that we need a tool to restore the balance of the human body to be able to do our daily activity. The tool is called prostheses. The design and manufacture of prototypeshank prostheses under knee is intended for persons who have 162 cm height and 57 Kg of average weight. Prostheses are aimed to the persons who only lost one limb below the knee. In this design, the length of the shank can be set according to the length of leg amputated and is intended to persons who are still experiencing high growth (teenager). The material is stainless steel 316L. The shank has a length 200-300 mm, width 67 mm and 2 mm thick.

scholarly journals Using Stainless Steel and Titanium Alloy in Charcot Foot Reconstruction. FEA Simulation and Clinical Case

2020 ◽  
Vol 71 (4) ◽  
pp. 235-247
Author(s):  
Marius Vasilescu ◽  
Iulian Antoniac ◽  
Dan Ioan Stoia ◽  
Dan Laptoiu ◽  
Andreea Stoia ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Titanium Alloy ◽  
Clinical Case ◽  
3D Model ◽  
Stress Shielding ◽  
Shielding Effect ◽  
Charcot Foot ◽  
Element Analysis ◽  
Foot Biomechanics ◽  
Foot Reconstruction

The aim of the study was to simulate a clinical case of Charcot foot reconstruction, using finite element analysis (FEA). Our work starts from a clinical failure case of Charcot arthrodesis, were one stainless steel Midfoot Fusion Bolt (MBF) prematurely failed. Starting from CT images a 3D model of the foot was reconstructed and together with the intramedullary bolts a virtual assembly was build. In addition, a second 3D model containing 3 MBF screws and one titanium locking compression plate (LCP) was constructed. The loading conditions used in FEA were extracted based on foot biomechanics according to the gait phases. The results are showing the critical sections of the bolts and also the stress shielding effect that appears on the bolts when the plate is used as supplementary fixation element. By comparing the stress values on bolts and plate with the yield strength of stainless steel and titanium alloy that are regularly used for manufacturing these implants, a valid reconstruction solution was found. This result can help surgeons in establishing the proper bolt insertion and plate positioning for minimizing the implant failure risk.

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