Effect of infill on resulting mechanical properties of additive manufactured bioresorbable polymers for medical devices

Materialia ◽  
2020 ◽  
Vol 12 ◽  
pp. 100732 ◽  
Author(s):  
Clayton J. Culbreath ◽  
Brian Gaerke ◽  
M. Scott Taylor ◽  
Seth D. McCullen ◽  
O. Thompson Mefford
Keyword(s):  
Mechanical Properties ◽  
Medical Devices ◽  
Bioresorbable Polymers

Effect of Infill on Resulting Mechanical Properties of Additive Manufactured Bioresorbable Polymers for Medical Devices

2020 ◽  
Author(s):  
Clayton J. Culbreath ◽  
Brian Gaerke ◽  
M. Scott Taylor ◽  
Seth D. McCullen ◽  
O. Thompson Mefford
Keyword(s):  
Mechanical Properties ◽  
Medical Devices ◽  
Bioresorbable Polymers

scholarly journals Experimental Measurements of Mechanical Properties of PUR Foam Used for Testing Medical Devices and Instruments Depending on Temperature, Density and Strain Rate

Materials ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 4560 ◽  
Author(s):  
Zdenek Horak ◽  
Karel Dvorak ◽  
Lucie Zarybnicka ◽  
Hana Vojackova ◽  
Jana Dvorakova ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Strain Rate ◽  
Mechanical Testing ◽  
Medical Devices ◽  
Optical Microscope ◽  
Surgical Instruments ◽  
Effect Of Temperature ◽  
Experimental Measurements ◽  
Compression Tests ◽  
Biomedical Material

Rigid polyurethane (PUR) foam is products used as a biomedical material for medical device testing. Thermal stability is a very important parameter for evaluating the feasibility of use for testing surgical instrument load during drilling. This work aimed to perform experimental measurements to determine the dependence of the mechanical properties of a certified PUR on temperature, strain rate and density. Experimental measurements were realised for three types of the PUR samples with different density 10, 25 and 40 pounds per cubic foot. The samples were characterised in terms of their mechanical properties evaluated from tensile and compression tests at temperatures of 25 °C, 90 °C and 155 °C. Furthermore, the structures of the samples were characterised using optical microscope, their thermal properties were characterised by thermogravimetric analysis, and their density and stiffness with the effect of temperature was monitored. The results show that it is optimal not only for mechanical testing but also for testing surgical instruments that generate heat during machining. On the basis of experimental measurements and evaluations of the obtained values, the tested materials are suitable for mechanical testing of medical devices. At the same time, this material is also suitable for testing surgical instruments that generate heat during machining.

Silicone-Based Tissue-Mimicking Phantom for Needle Insertion Simulation

2014 ◽  
Vol 8 (2) ◽  
Author(s):  
Yancheng Wang ◽  
Bruce L. Tai ◽  
Hongwei Yu ◽  
Albert J. Shih
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Medical Devices ◽  
Room Temperature ◽  
Needle Insertion ◽  
Mineral Oil ◽  
Medical Procedures ◽  
Insertion Force ◽  
Needle Insertion Force ◽  
Porcine Tissues

Silicone-based tissue-mimicking phantom is widely used as a surrogate of tissue for clinical simulators, allowing clinicians to practice medical procedures and researchers to study the performance of medical devices. This study investigates using the mineral oil in room-temperature vulcanizing silicone to create the desired mechanical properties and needle insertion characteristics of a tissue-mimicking phantom. Silicone samples mixed with 0, 20, 30, and 40 wt. % mineral oil were fabricated for indentation and needle insertion tests and compared to four types of porcine tissues (liver, muscle with the fiber perpendicular or parallel to the needle, and fat). The results demonstrated that the elastic modulus and needle insertion force of the phantom both decrease with an increasing concentration of mineral oil. Use of the mineral oil in silicone could effectively tailor the elastic modulus and needle insertion force to mimic the soft tissue. The silicone mixed with 40 wt. % mineral oil was found to be the best tissue-mimicking phantom and can be utilized for needle-based medical procedures.

scholarly journals Mechanical Properties of Additively Manufactured Thermoplastic Polyurethane (TPU) Material Affected by Various Processing Parameters

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 3010
Author(s):  
Tao Xu ◽  
Wei Shen ◽  
Xiaoshan Lin ◽  
Yi Min Xie
Keyword(s):  
Mechanical Properties ◽  
Medical Devices ◽  
Thermoplastic Polyurethane ◽  
Critical Factor ◽  
Processing Parameters ◽  
Aerospace Engineering ◽  
Post Processing ◽  
Build Orientation ◽  
Good Biocompatibility ◽  
Material Tests

Thermoplastic polyurethane (TPU) is a polymer material that has high ductility, good biocompatibility and excellent abrasion resistance. These properties open a pathway to manufacturing functional TPU parts for applications in various fields such as aerospace engineering, medical devices and sports equipment. This study aims to investigate the mechanical properties of additively manufactured TPU material affected by three different processing parameters, including build orientation, mix ratio of the new and reused powders and post-processing. A series of material tests are conducted on TPU dumb-bell specimens. It is found that the mix ratio of the new powder is the most critical factor in improving the mechanical properties of the printed TPU parts. Compared to reused powder, new powder has better particle quality and thermal properties. Besides, build orientation is also a very important factor. TPU parts printed in flat and on-edge orientations show better tensile strength and deformability than those printed in upright orientation. In addition, post-processing is found to significantly enhance the deformability of TPU parts.

Strengthening of Dense Bioceramic Samples Using Bioresorbable Polymers – A Statistical Approach

2009 ◽  
Vol 4 ◽  
pp. 27-39 ◽  
Author(s):  
Sergey V. Dorozhkin ◽  
T. Ajaal
Keyword(s):  
Mechanical Properties ◽  
Experimental Design ◽  
Flexural Strength ◽  
Orthogonal Array ◽  
Calcium Phosphates ◽  
Treatment Temperature ◽  
Taguchi Methods ◽  
Minimal Amount ◽  
Statistical Experimental Design ◽  
Bioresorbable Polymers

Mechanical properties of bioceramics are poor and need to be improved for biomedical applications. In order to do this, bioceramics may be strengthened by bioresorbable polymers. In this study, the mechanical properties of poly(ε-caprolactone), PCL, coated dense bioceramic pellets made of silica-contained calcium phosphates were studied and analyzed using a statistical experimental design in conjunction with Taguchi methods for optimization. The aim of this experimental work was to maximize the pellet flexural strength and minimize the amount of deposited PCL. The most important factors affecting the strengthening of the ceramic pellets were evaluated. Four independent processing variables (a removal technique of an excess polymer solution, concentration of PCL in the solution, a heat treatment temperature and the number of dipping) with three levels of variability were tested using an L9 (34) orthogonal array. A statistical experimental design using the analysis of means and orthogonal array was applied to optimize the responses of these variables. The optimal conditions for achieving the maximal flexural strength of the coated pellets at the minimal amount of the deposited PCL were determined. A high quality dense bioceramic pellets with ~ 10.5 MPa flexural strength and ~ 80 μm thickness (~ 21 mg weight) of the deposited PCL coating were manufactured as a result.

Mechanical Properties of Plasma Immersion Ion Implanted PEEK for Bioactivation of Medical Devices

2015 ◽  
Vol 7 (41) ◽  
pp. 23029-23040 ◽  
Author(s):  
Edgar A. Wakelin ◽  
Ali Fathi ◽  
Masturina Kracica ◽  
Giselle C. Yeo ◽  
Steven G. Wise ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Medical Devices ◽  
Ion Implanted

MXenes and ultrasonication

2019 ◽  
Vol 7 (18) ◽  
pp. 10843-10857 ◽  
Author(s):  
Massoud Malaki ◽  
Aziz Maleki ◽  
Rajender S. Varma
Keyword(s):  
Mechanical Properties ◽  
Transition Metal ◽  
Medical Devices ◽  
Metal Carbides ◽  
Transition Metal Carbides ◽  
Optical And Mechanical Properties

MXenes, 2D transition metal carbides/nitrides, with superior electrical, optical, and mechanical properties is a recent discovery and have already been deployed in a variety of fields such as batteries, composites, sensors and medical devices.

scholarly journals New Titanium Alloys, Promising Materials for Medical Devices

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 5934
Author(s):  
Madalina Simona Baltatu ◽  
Petrica Vizureanu ◽  
Andrei Victor Sandu ◽  
Nestor Florido-Suarez ◽  
Mircea Vicentiu Saceleanu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Titanium Alloys ◽  
Medical Devices ◽  
Linear Polarization ◽  
Electrochemical Impedance ◽  
Passive Layer ◽  
Dynamic Polarization

Titanium alloys are used in medical devices due to their mechanical properties, but also for their corrosion resistance. The natural passivation of titanium-based biomaterials, on the surface of which a dense and coherent film of nanometric thickness is formed, composed mainly of TiO2, determines an apparent bioactivity of them. In this paper, the method of obtaining new Ti20MoxSi alloys (x = 0.0, 0.5, 0.75, and 1.0) is presented, their microstructure is analyzed, and their electrochemical responses in Ringer´s solution were systematically investigated by linear polarization, cyclic potential dynamic polarization, and electrochemical impedance spectroscopy (EIS). The alloys corrosion resistance is high, and no evidence of localized breakdown of the passive layer was observed. There is no regularity determined by the composition of the alloys, in terms of corrosion resistance, but it seems that the most resistant is Ti20Mo1.0Si.

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