Expert Details

Expert in Injury Biomechanics (head and spine), Medical Device Design, Structural Analysis, Patents

Expert ID: 726312 Maryland, USA

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Expert has over 30 years of experience in structural analysis, including experience porting finite element codes to specialized architectures, developing special-purpose mesh generation tools, and assessing the correspondence of structural models with experimental measurements. Expert has developed de novo programs to simulate bone remodeling around orthopedic devices, and has broad experience in strucural nonlinearities such as contact, plasticity, NiTinol alloys, and fracture mechanics. Expert has used structural analyses in expert witness testimony and has reviewed the testimony of opposing experts. Based on a doctorate in mechanical engineering from MIT, years of university teaching experience in mechanics and biomechanics, and on over 30 refereed journal articles, Expert has the appropriate background for a range of engagements in mechanics and structural analysis.

Expert passed the patent bar in 2002, and has testified in a number of patent disputes.

Expert has been working in biomechanics since his BS degree in mechanical engineering from MIT in 1980, and worked building instrumentation while an undergraduate as well. His initial position, between undergraduate and graduate school, was at the orthopedic biomechanics lab at the Mayo Clinic from 1980 to 1981, when he returned to graduate school. Expert has published on bone mechanics, cartilage mechanics, injury mechanics, and circulatory control over the space of the last 30 years. Currently, he is engaged in research on traumatic brain injury due to blast loading at the Johns Hopkins University Applied Physics Laboratory, where he is able to consult for non-government-related issues. Expert has given deposition testimony in over 20 cases regarding injury mechanics and the mechanical factors that are associated with injuries.

Dr. Harrign has taught biomechanics and mechanical design at Rice University and at three medical schools (to residents in preparation for professional exams).

Expert has a broad background in medical device analysis and consulting, including projects involving stents, endoscopic surgical tools, bone plates, pacemaker leads, catheters, total joint replacements, inhalers, vena cava filters, wound therapy devices, exercise equipment, in vitro fertilization equipment, and insulin pumps. Expert has published papers on failure processes in total joint replacements, testing methods for interfaces, and elastography. Since passing the patent bar in 2002, Expert has consulted on several patent actions involving medical devices as well as actions involving paintball guns, children's furniture, and other devices.

Expert is currently developing finite element computer models of the head, neck and thorax for the analysis of injury in military applications. In the past several years, Expert has developed computer models for mechanisms of mild traumatic brain injury, blast-related head trauma, and blast-resistant crew seating in military vehicles. In the past several years, Expert has also given expert witness testimony on injuries in automobile accidents and industrial accidents, including cases involving construction and offshore oil platforms.

Oil Rig Injury Cases: Testified in court and deposition on claims involving back and neck injuries during duties on oil rigs: Pulling slips, Nippling Down.Developed measurements and mathematical models for fluid pumping due to loose tolerances in orthopedic implants under load.Measured strains in a deep water repair device for 20 inch pipelines to assess the accuracy needed for proper sealing at depth.Developed an ultrasonic indentation gauge for measuring cartilage material stiffness in situ.Developed a measurement technique and measured strains within tissue expanders for reconstruction after mastectomy: Showed that the local curvature of the tissue expander was responsible for strain differences within the envelope of the expander.

Expert may consult nationally and internationally, and is also local to the following cities: Baltimore, Maryland - Frederick, Maryland - Gaithersburg, Maryland - Bowie, Maryland - Wilmington, Delaware - Lancaster, Pennsylvania - Alexandria, Virginia

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Year Degree Subject Institution
Year: 1999 Degree: MBA Subject: Marketing and Entrepreneurship Institution: University of Houston
Year: 1985 Degree: ScD Subject: Mechanical Engineering Institution: MIT
Year: 1980 Degree: BS Subject: Mechanical Engineering Institution: MIT

Work History

Years Employer Title Department Responsibilities
Years: 2009 to 2010 Employer: Johns Hopkins University Applied Physics Laboratory Title: Senior Professional Staff Department: National Security Technology Division Responsibilities: He is leading computational analysis efforts in the biomechanics of injuries to the head, neck, spine, and thorax due to blast loading
Years: 2005 to 2009 Employer: Foster-Miller Inc Title: Senior Engineer Department: Structures and Transportation Responsibilities: Engineering Program Development in Biomechanics; Blast Mitigation, Injury prevention, Structural Analysis, and Computational Fluid Dynamics.
Years: 2000 to 2005 Employer: Exponent Failure Analysis Associates Title: Senior Engineer Department: Biomechanics Responsibilities: Expert witness on injury analysis, medical devices, and patent infringement. Contract R&D on medical devices.
Years: 1999 to 1999 Employer: Resmed Title: Director Department: Business Development Responsibilities: Tasked with developing strategies to provide CPAP in stroke and heart failure.
Years: 1993 to 1999 Employer: UT Medical School at Houston Title: Assistant Professor Department: Orthopedics Responsibilities: Develop research programs, supervise resident research, collaborate with medical faculty
Years: 1993 to 1999 Employer: Rice University Title: Visiting Associate Professor Department: Mechanical Engineering Responsibilities: Develop and teach Biomechanics courses, teach engineering design, and teach applied mechanics
Years: 1993 to 1999 Employer: University of Houston Title: Adjunct Professor Department: Mechanical Engineering Responsibilities: Supervise graduate students.

Government Experience

Years Agency Role Description
Years: 2008 to 2009 Agency: USAMRMC Role: Reviewer Description: Reviewed Proposals for funding in Traumatic Brain Injury

Career Accomplishments

Associations / Societies
Orthopedic Research Society;
American Society of Mechanical Engineers.
Licenses / Certifications
PE Texas;
Registered Patent Agent, USPTO.
Publications and Patents Summary
Thirty-three (33) refereed research papers.

Additional Experience

Expert Witness Experience
Approximately 20 depositions on injury, patent cases, and medical devices.
Six in-court appearances in injury, product liability, and patent cases.
Passed the Patent bar (as an agent), 2002.
Training / Seminars
Biomechanics courses for orthopedic residents;
Biomechanics courses for undergraduate and graduate students at Rice University
Marketing Experience
Long-term exposure (over 25 years) to orthopedic devices and technology.

Language Skills

Language Proficiency
Russian Mid-intermediate level - can read scientific papers and web sites.

Fields of Expertise

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