Day 2 :
- 3D Printing: Innovations|Polymers in 3D Printing |3D Materials | 3D Organ Printing| Radiation oncology Future Technology | Impact on Manufacturing Industry
Randy E Ellis
Queen’s University, Canada
Seoul National University of Science and Technology, South Korea
Title: Design and fabrication of a porous cast using additive manufacturing
Time : 10:00-10:30
Keun Park has completed his PhD at Korea Advanced Institute of Science and Technology (KAIST), Korea, and Post-doctoral studies at University of Massachusetts Amherst, USA. He worked as a Senior Researcher at Samsung Electro-Mechanics Co., Korea. He is a Professor of Seoul National University of Science and Technology, Korea. His research fields are “Materials processing and additive manufacturing, including design for manufacturing (DFM) and design for additive manufacturing (DFAM)”. He has published more than 40 papers in reputed journals and has been serving as an Editor of International Journal of Precision Engineering and Manufacturing.
These days, additive manufacturing (AM) has been changed from the conventional rapid prototyping (RP) to direct fabrication of functional parts. As a direct fabrication method, a promising application of AM is to make customized parts for biomedical applications. In this study, a customized cast with a porous shell structure is developed to replace traditional plaster casts. Although recent developments of customized casts are based on three-dimensional (3D) scan data of a human body and are designed to fit the body, such as personalized design might not be applicable to real orthopedic treatments because it takes time to prepare 3D scan data (>1 hour), to construct 3D solid model with a number of ventilation holes and assembly features (>1 day), and to fabricate cast parts using additive manufacturing (>2 days). To overcome such a limitation, this study proposes a new design concept for porous casts with the following features: The porous cast shells are prepared as standard sizes (i.e. small, medium, and large); one can choose a cast that is a little larger than his/her size; a number of flexible pins with variable lengths are fabricated using additive manufacturing and are inserted in holes of the porous cast so that the cast can be fully supported on a human body. Considering that a flexible pin can be manufactured within 5 minutes using a commercial 3D printer, the proposed cast can be prepared within an hour and be applicable to orthopedic treatments thereby.
Fraunhofer Institute for Applied Polymer Research, Germany
Title: Material development for Rapid Prototyping for futur medical application
Time : 10:30-11:00
Wolfdietrich Meyer has completed his PhD in 2005 on Bioanalytical Electrochemistry. As a post doc he did research on nanoparticles applied for MRI contrast agents at the Charité in Berlin.From 2009 on he is focusing on material development for 3D printing for medical application at the Fraunhofer Institute for Applied Polymer Research.
Photocurable liquid monomers were crosslinked by laser irradiation to form cytocompatible, non-degradable polymers with adjustable mechanical properties to build up artifical blood vessel structures. The mechanical properies of the vessel-like material is mimicing the natural ideal and is ready to be biofunctionalized and seeded with epithelial cells in the inner side of the photopolymeric tube system. Similar a high porous and branched tubesystem is manufactured by stereolithograhy to find its application as blood supplying system for tissue engineering.
Synthesis of model photoaktive crosslinker are indroduced that allow the adaptation of mechanics in photopolymers for artifical soft tissues. Mechanical studies regarding the elasticity, tear strength and tear tensile strength of the photopolymers are presented.
V. I. Bujakas
P. N. Lebedev Physical Institute of Russian Academy of Science, Russia
Title: 3D-printing technology for physical simulation of petal-type space mirror deployment
Time : 11:20-11:50
Victor Bujakas is the leading scientist of P.N. Lebedev Phisical Institute of Russian Academy of Science. He got his PhD from Moscow Peoples' Friendship University, got his honorable PhD from Institute of Control Science of Russian Academy of Science. During several years was leading scientist in Radioastron mission development. In the moment is working in computer and physical simulation of large deployable space structures development. He has published more than 20 papers in reputed journals.
To create antennas of large space telescopes, the designs of large transformable mirrors of various types were proposed and developed. The classic design of solid petal type deployable reflector was proposed by Dornier Corporation during "FIRST" space project development ("FIRST" - far infrared space telescope). The same deployment kinematics has been successfully implemented in the design of the 10-meter mirror of Radioastron project, which was launched in 2011 and operates in the centimeter range of the spectrum.
However, there are drawbacks that limit the use of this kinematic scheme to create large deployable mirrors for short waves. Main lacks of the design are as follows:
- after deployment the petals are not tied together by outer loop of the mirror, therefore the rigidity of open reflector is not very high (the geometric rigidity of closed shell did not used),
- errors in setting the position axes of cylindrical hinges and inaccuracies of petals opening distort the shape of the mirror surface, the value of which increases from the axis of rotation to the periphery of the mirror; however this part of mirror makes a decisive contribution to the effective area of the reflector and for short wave mirror must be made very precise.
To overcome these shortcomings another version of petal type mirror deployment kinematics was proposed and developed. We propose to retain the link between adjacent petals during all deployment process.
Young Researchers Forum
Rutgers School of Mechanical & Aerospace Engineering, USA
Title: Development of economic DLP and resin based 3D printing system for micro fabrication of fine resolution
Time : 11:50-12:20
Shweta Thapa completed her MEng in Mechanical and Aerospace Engineering at Rutgers University. Her special interest in 3D printing grew during her project work in college as well as interning for 3D printing companies. She is the Founder of 3Ducators - a non-profit organization for empowering communities using 3D printing. She has also worked in great mechanical industries like Atlas Copco and Trumpf Photonics. She is an esteemed member of National Association of Professional Women (NAPW).
3D printing has revolutionized the world of manufacturing, education, food, jewelry and will no doubt be our next in house robot, making luxury a convenience for us. My deep rooted interests for 3D printing in biomedical sciences and its upgrades in the medical field inspired me to design an economic DLP cum resin 3D printer for fine resolution and precise micro fabrication. This printer finds great application in the medical industry and jewelry business. The system is based on projection of micro stereo-lithography which involves additive layer by layer manufacturing of the 3D polymer on application of LED light from the projector. Existing DLP and resin printers cost manifolds and are not accessible to the common man. A printer that can solve problems of the mankind and is affordable at the same time is the subject matter of this technology. A compact and portable 3D printing system composed of a simple desktop and a 700 lumen light projector can be used to make microstructures and soft materials of the order of 50-300 microns. The study involves the development of the experimental setup, optical and material characterization of the system and product specimen testing on the shape memory polymer.
Central University of Technology, South Africa
Title: Process chain for fabrication of external maxillofacial prosthesis using additive manufacturing
Time : 12:20-12:50
Nneile Nkholise is pursuing her Master’s Degree in Mechanical Engineering at Central University of Technology and completed her Under-graduate Degree at the same university. She is the Director of iMed Tech, a company that designs and manufactures medical prosthesis particularly segmented at the breast prosthesis. She has been recognized as World Economic Forum top female Innovator in Africa for her role in using additive manufacturing in prosthesis fabrication.
External maxillofacial prostheses are presently fabricated through traditional manufacturing techniques in South Africa. The limited number of technologists with the necessary skill as well as the lengthy time it takes to produce a single prosthesis results in a significant backlog in the provision of these prostheses at especially state run hospitals. Although additive manufacturing (AM) has been used before as secondary process to manufacture these prostheses, no proper study has been done to determine which AM process is best suited to this application. An improved process chain to manufacture external maxillofacial prostheses can be developed using AM. These prostheses can be manufactured at reduced time and without the necessary skill required to first sculpt a pattern in wax. An investigation into determining which AM process is best suited to manufacture external maxillofacial prostheses will lead to more accurate and cost effective prosthetics.
The Johns Hopkins Hospital, USA
Title: Cardiovascular tissue engineering using 3D printing technology
Time : 12:50-13:20
Narutoshi Hibino completed his Medical degrees at Ehime University, Japan. He completed Cardiac and Cardiovascular Surgery fellowships and obtained board certifications at Tokyo Women’s Medical University. Following a research fellowship for Tissue Engineering at Yale University, he completed Pediatric Cardiac Surgery fellowships at Children’s National Medical Center in Washington and Nationwide Children’s Hospital in Columbus, Ohio before joining the faculty at Johns Hopkins University School of Medicine.
Cardiovascular disease is one of the leading causes of death worldwide despite the variety of medical, mechanical and surgical strategies. We have developed novel 3D printing technologies that could change the practice of cardiovascular disease treatment, including patient specific 3D printed tissue engineered vascular graft and bio 3D printed cardiac tissue. Author will discuss insights of these new 3D printing technology as well as challenges; we need to overcome for future clinical application and commercialization.
ASTM International, USA
Title: Progress towards metal additive manufacturing standardization
Time : 14:10-14:40
Mohsen Seifi joined ASTM International in 2016 as a first Director of Additive Manufacturing Programs, in which he facilitates’ standardization activities across all ASTM technical committees and building new partnerships as well as development of new AM related products and services within diverse ASTM portfolios. He has also an appointment as a Staff Scientist/Researcher in Advanced Manufacturing and Mechanical Reliability Center (AMMRC) at Case Western Reserve University (CWRU). He received both his Master’s degree and Doctoral degree at CWRU in Materials Science and Engineering with emphasis on “Metal additive manufacturing qualification and standardization”. He has conducted extensive work on qualification of advanced materials including titanium and super alloys made by additive manufacturing (AM) techniques for use in critical applications. He has co-authored more than 20 publications and has presented more than 60 papers at various technical meetings.
As the metal additive manufacturing (AM) industry moves towards industrial production, the need for qualification standards covering all aspects of the technology becomes ever more prevalent. While some standards and specifications for documenting the various aspects of AM processes and materials exist and continue to evolve, many such standards still need to be matured or under consideration/development within standards development organizations (SDOs). A recent joint ASTM and ISO Partner Standards Developing Organization (PSDO) agreement has provided a unique opportunity to create globally recognized standards for additive manufacturing (AM); the purpose of the agreement is to eliminate duplication of effort while maximizing resource allocation within the additive manufacturing industry. A resource to aid in the identification and development and approval of new standards is a new framework that has introduced a comprehensive structure to target various aspects of the AM space, including feedstock materials, process/equipment, and finished parts properties. This approach will also enable the development of application-specific standards to address the needs of the aerospace, medical device, and automotive industries. In addition, recent efforts to create a gap analysis roadmap through America Makes & ANSI Additive Manufacturing Standardization Collaborative (AMSC) can provide a platform to coordinate and accelerate the development of industry-wide additive manufacturing standards consistent with stakeholder needs, thereby facilitating the growth of the AM industry. This roadmap is designed to identify standards (both approved and in process), assess gaps, and make recommendations for priority areas where there is a perceived need for additional R&D and standardization. Various ASTM technical committees are considering the development of standards for AM; in particular, Committee F42 on additive manufacturing technologies is the focal point for most of the ongoing activities within ASTM. While Committee F42 continues to develop standards (jointly with ISO as well as ASTM-specific), there are opportunities in areas occupied by additional ASTM technical committees where collaboration & leveraged expertise could contribute to the overall standards portfolio described by the structure described above. This brief presentation will provide insight based on the recent ASTM/ISO agreement as well as AMSC roadmap; potential opportunities and technical considerations in support of future standards development. A pathway for qualification/certification of AM parts enabled by the appropriate standardization landscape will also be discussed.
Gean V Salmoria
Federal University of Santa Catarina, Brazil
Title: 3D printing of drug delivery systems by laser sintering
Time : 14:40-15:10
Gean V Salmoria completed his Graduation in Chemistry; MSc at Federal University of Santa Catarina (UFSC) in Brazil and; PhD in Microwave Processing at Institut National Polytechnique de Toulouse in France. He is a Specialist in Electro-thermal processes and Organic Material Chemistry. His research interest includes “Fabrication using microwave, ultra-violet and infra-red lasers, additive manufacturing and rapid tooling for extrusion and injection molding applied to automobile, aerospace and biomedical industries”. He is a Professor in Mechanical Engineering department of UFSC since 2001. He has published more than 60 papers in reputed journals and has been serving as an Editorial Board Member of the Journal of Advanced Manufacturing Research.
The increase in the number of people affected by genetic and infectious diseases resistant to conventional treatments has led to the need to develop new medical treatments by understanding the mechanisms of action and the targets of pharmacological action at the molecular level. As well as, to develop more specific transport systems for existing hydrophobic and hydrophilic drugs in order to increase the therapeutic efficacy of these drugs. Implantable drug delivery devices (DDDs) technology offer several advantages over conventional methods such as oral or parenteral dosage form, allowing specific drug administration at the target site, minimizing potential side effects. This therapy may provide controlled release of a medicine for acute and chronic treatments. In recent years, Additive Manufacturing (also known as 3D printing) processes such as Selective Laser Sintering (SLS) has shown great prominence in the biomedical field, and several researchers have conducted studies showing a wide diversity of materials and applications, such as the additive manufacturing of medical products, scaffolds and drug delivery devices (DDDs). SLS is a good alternative to controlling the porosity of bio-inert and bio-absorbable polymeric matrices and, consequently, control the drug release of implantable DDDs. In this study, DDDs with polymeric matrices, hydrophilic and hydrophobic drugs were manufactured and characterized. The structure and properties of the manufactured DDDs were evaluated and correlated with the processing conditions.
Wei Min Huang
Nanyang Technological University, Singapore
Title: Re-programmable sequential folding/unfolding in 3D printed structures
Time : 15:10-15:40
Wei Min Huang completed his PhD at Cambridge University, UK. After that, he joined the School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore. He has over 20 years of experience on Shape Memory Materials and Technology and has published research articles extensively in this field, including two books about shape memory alloys and shape memory polymers, respectively. His research interest in 3D printing is actually focused on 4D features, in particular to achieve re-programmable sequential folding/unfolding of 3D printed structures via the shape memory effect.
Sequentially controlled folding/unfolding (or shape morphing) has been a hot research topic for a number of years. Given the additional feature of shape switching, 3D printing can be naturally extended to 4D printing, so that the application area of 3D printed structures can be significantly widened. In technical terms, there are four basic approaches to achieve 4D printing, but so far to realize sequentially pre-determined morphing in 3D printed sophisticated structures is still a challenge. In this paper, by means of integration of two separately well explored concepts, namely, multiple stable structure and compliant mechanism, we demonstrate how to achieve sequentially controlled morphing in 3D printed structures. More importantly, we show that, the morphing sequence of the 3D printed structures not only can be determined in the early design stage before the structures have been 3D printed, but also can be re-programmed in the later on stage after the structures have actually been printed utilizing the shape memory effect to fix the structures into a new shape. Since the heat/chemo-responsive shape memory effect has been proved to be an intrinsic feature of most polymeric materials, re-programmable sequential folding/unfolding can be easily realized in 3D printed polymeric structures by design.