Medical Device

YUHANG CHENG

**** ***** **. • Edina, MN-*****-***4 • 406-***-****

mvegjt@r.postjobfree.com

PROFESSIONAL SUMMARY

Senior materials scientist with ten years of engineering, research and project management experience in medical device and dental instrument industries. Seventy technical publications in peer reviewed journals. Technical reviewer for fourteen peer reviewed journals. Selected areas of expertise include:

Metallurgy, phase transformation, and material science. Material selection for welding and solding of medical devices and dental instruments.

Surface characterization techniques (XRD, XRR, Raman spectroscopy, FTIR, RBS/AGS, EDXA, SEM, FIB, TEM, Ellipsometry, FTIR, surface profilometer, and AFM).

Material property testing (nanoindentor, tribometer, strength, fatigue, internal stress, corrosion, adhesion, wear, tribology, and erosion).

Accelerated life-time testing and failure mode and failure mechanism analysis.

Multi-disciplinary process development and qualification in medical device and dental instrument.

Design of experiment (DOE) for advanced materials/process development and optimization.

Thin film deposition (CVD/PECVD/PVD/sputtering/filtered cathodic arc) techniques, plasma physics, plasma- thin film surface interaction, and thin film process-structure-property correlation.

Technical leader with strong project management skills.

PROFESSIONAL EXPERIENCE

MEDTRONIC INC. – Brooklyn Center, MN 2010 –2012

Principle Product Engineer – FEEDTHROUGH DEVELOPMENT GROUP

Developed and optimized materials and related processes for electric leads and feedthroughs used in medical devices.

Developed and qualified the Blackwell 2 pin feedthrough manufacturing processes (OQ/PQ) and released the processes to the production.

Developed testing methods for characterizing the tribological property of the multi-lumen tubing ID surface and MA adhesion. The ideal has been approved for patent application.

Identified the failure mode and mechanism of the Sevento electric lead breakage. Developed a lubricious coating for electric leads to increase the cable fatigue life. This ideal has been approved for patent application.

Identified the failure mode and mechanism of feedthroughs in accelerated reliability test. Developed a new coating for feedthroughs to prevent the formation of brittle intermetallic layer during brazing and the corrosion during immersion test to increase the feedthrough reliability.

Designed new UTOPIA filtered feedthrough assembly and developed the manufacturing process.

Performed accelerated life time test to investigate effects of the Nb film thickness on the reliability of the feedthroughs.

Investigated the influence of surface roughness on the laser welding performance of the Ti alloy. I also developed solder process and alloy for feedthroughs and perform welding material selection.

Design hermetic check fixture and perform Gage R&R.

American Eagle Instruments Inc-Missoula, MT 2006-2010

Principle Investigation/Materials Scientist – PVD COATING R&D DEPARTENT

Responsible for leading the development of stainless steel base materials, novel thin film materials, characterization techniques and processes for next-generation dental instruments. Provide technical leadership to define, develop and transfer filtered cathodic arc deposition technique from development to production.

Led the program “Advanced Surface Technologies for Medical Applications” as principle investigator, TATRC, U.S. Army Medical Research & Materiel Command, W81XWH-08-2-0023, 2008-2010.

Developed and optimized new advanced coatings (TiN, TiN/Ti multilayer, TiCN, CrN, TiAlN, TiSiN, Diamond-like carbon, ZrN) and process for dental instruments, medical instruments, and orthopedic devices, by using filtered cathodic vacuum arc technique and plasma enhanced chemical vapor deposition technique.

Led the selection of stainless steel and the development of heat treatment processes for dental instruments, medical instruments, and medical devices to improve their hardness, toughness, corrosion resistance, and fatigue life, increasing the service life time and reliability of the dental instruments.

Developed and optimized a cleaning process for PVD coating on dental instruments, increasing the production yield from 70% to >95%.

Led the characterization of the surface morphology, microstructure, crystalline structure, bonding structure, adhesion, hardness, elastic modulus, tribology, internal stress, and corrosion properties of the thin films by using SEM, XRD, XRR, XPS, TEM, EDX, nanoindentation, pin-on-disk tribometer, surface profilometer, and potential dynamic polarization measurement.

Led the transfer of the developed new coatings and processes to the production of dental instruments.

Led the failure analysis of the customer returned dental instruments.

Developed tribological and fatigue testing method for dental instruments.

Provided technique support for manufacturing, sales, marketing, custom support, and failure analysis of the dental and medical instruments and devices.

Led the development of stainless steel base materials, novel thin film materials, characterization techniques and processes for next-generation dental instruments. Provide technical leadership to define, develop and transfer filtered cathodic arc deposition technique from development to production

University of Texas at Arlington-Arlington, TX 2005-2006

Postdoctoral Researcher – MATERIALS SCIENCE AND ENGINEERING DEPARTMENT

Responsible for managing lab facilities, developing advanced thin film deposition technique, and characterize electrolytic plasma treated 4140 steels.

Managed the facilities in surface engineering lab (corrosion potential measurement system, magnetron sputtering system, tribometer).

Designed and developed a plasma enhanced magnetron sputtering system for the deposition of metal (Fe and Co) containing diamond like carbon films (C/Cr multilayer and Co/C magnetic nanocomposite films).

Developed and optimized novel electrolytic plasma cleaning (EPP) process for 4140 steels.

Characterized the EPP treated 4140 steel by XRD, TEM, SEM, AES, hardness indenter, corrosion potential tester, and fatigue tester. Developed a cross sectional TEM sample preparation method.

Carnegie Mellon University –Pittsburg, PA 2003-2005

Postdoctoral Researcher – PHYSICS DEPARTMENT

Responsible for the synthesizing and characterizing of Fe nanoparticles.

Synthesized Fe, Fe3O4, Fe/Pt core/shell nanoparticles with a size of 3-10 nm by high temperature chemical methods.

Characterized the structure and magnetic properties of the Fe and nanoparticles by TEM and SQUID.

TECHNISCHE UNIVERSITAT CHEMNITZ –Chemnitz, Germany 2001-2003

Postdoctoral Researcher – PHYSICS DEPARTMENT

Responsible for the plasma diagnostics, optimizing deposition process of MgO films deposited by mid-frequency magnetron sputtering, and characterizing optical and secondary electron emission properties of the MgO films.

Investigated the properties of the mid-frequency magnetron sputtering using Langmuir probe, mass spectroscopy, and optical emission spectroscopy.

Developed and optimized deposition process of the MgO films deposited by mid-frequency magnetron sputtering.

Characterized the surface morphology, crystalline structure, optical property, and mechanical property of the MgO films by AFM, XRD, XPS, ellipsometer, and nanoindenter,

Developed a testing system for measuring the secondary electron emission properties of the MgO films.

NANYANG TECHNOLOGICAL UNIVERSITY – Singapore 1999-2001

Research Fellow – ELECTRIC AND ELECTRONIC ENGINEERING DEPARTMENT

Responsible for the deposition and characterization of transition nitride, diamond like carbon based nanocomposite coatings deposited by off-plane double bend filtered cathodic arc (FCVA), and their application on hard disk drive, MEMs, semiconductor, field emission, and biomedical implants.

Developed a ion beam assisted FCVZ technique for the deposition of super hard CN films.

Developed and optimized deposition process for diamond like carbon based nanocomposite films, i.e. tetrahedral amorphous carbon (ta-C films), carbon nitride films, and metal (Cr, W, Fe, Ni, Mo, Cu, V, Al, and Ti) containing tetrahedral carbon films (ta-C: Me), by off-plane double-bend filtered cathodic vacuum arc (FCVA) technique.

Developed and optimized deposition process for Cr, Cu, TiN, TaN, ZrN, and (Ti,Al)N films deposited by off-plane double-bend filtered cathodic vacuum arc (FCVA) technique.

Investigated the application of the diamond like carbon based nanocomposite films for hard disk, biomedical, field emission, and MEMs.

Investigated the application of the TiN, TaN, ZrN, Ta, Ti, and Cu films in the microelectronic fields.

Characterized the surface morphology, crystalline structure, composition, bonding structure, optical property, and internal stress, hardness, and tribological properties of the films by AFM, XRD, XPS, Raman, optical spectroscopy, ellipsometer, surface profilometer, nanoindenter, and tribometer.

HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY – HUBEI, CHINA 1997-1999

Associate Professor – MATERIALS SCIENCE AND ENGINEERING DEPARTMENT

Responsible for teaching class, supervising graduate students, and developing deposition techniques for DLC films.

Taught courses: Metallurgy, Phase Transitions in Solids, School of Materials Science and Engineering, Huazhong university of Science and Technology.

Supervised two master students and four undergraduate students in Material Science and Engineering Department, Huazhong university of Science and Technology, P.R. China.

Investigated the deposition mechanisms of diamond like carbon and carbon nitride films by radio frequency PECVD and pulsed laser ablation.

Characterized the biocompatibility of the carbon nitride coatings.

Developed a DC plasma enhanced pulsed laser ablation technique for the deposition of super hard CN films.

Developed and characterized CN films and TiN/(Ti,Al)N multi-layer nanocomposite films deposited by cathodic arc.

EDUCATION AND JOB-RELATED TRAINING

Ph. D in Materials Science and Engineering, Huazhong Uni. of Sci. & Techn., Hubei, China, 1997.

Dissertation: “Deposition and Modification of Diamond Like Carbon Coatings by PECVD”

Master of Science, Major: Metallic Materials and Heat Treatment, Huazhong Uni. of Sci. & Techn., Hubei, China, 1994. Thesis: Development and characterization of 65MnV tool steel for plastic mould.

Bachelor of Science, Major: Metallic Materials and Heat Treatment, Huazhong Uni. of Sci. & Techn., Hubei, China, 1991.

Trainings: Design of Experiment, Minitab, Statistic Theory and application, and Reliability, Medtronic.

OTHER EXPERIENCES

Editorial Board Member of The Open Materials Science Journal and The Open Biomaterials Journal, 2007-present.

Technical reviewer for 14 peer-reviewed international journals: Applied Physics Letter, J. of Vac. Sci. & Technol., Surface & Coating Technol., Vacuum, J. Applied Physics, Diamond and Related Materials, J. Crystal Growth, Journal: Physics B, Mater. Sci. & Eng. A, Mater. Sci. & Eng. A, Optical communication, Electrochemical and Solid-State Letters, and Physica E.

Technical reviewer of the International Conference on Metallurgical Coatings and Thin Films 2003, San Diego, USA.

Member of the AVS Science and Technology Society and ASM.

Awarded the Japan Society for the Promotion of Science (JSPS) fellowship of Japan government in 2001.

Biography was cited in the Chronicle of Human Achievement Who’s Who in Science and Engineering (7th Edition 2003-2004 and 2006-2007)

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