What is a Biomedical Engineer?
A Biomedical Engineer uses traditional engineering expertise to analyze and solve problems in biology and medicine, providing an overall enhancement of health care. Students choose the biomedical engineering field to be of service to people, to partake of the excitement of working with living systems, and to apply advanced technology to the complex problems of medical care. The biomedical engineer works with other health care professionals including physicians, nurses, therapists and technicians. Biomedical engineers may be called upon in a wide range of capacities: to design instruments, devices, and software, to bring together knowledge from many technical sources to develop new procedures, or to conduct research needed to solve clinical problems.
What are Some of the Specialty Areas?
In this field there is continual change and creation of new areas due to rapid advancement in technology; however, some of the well established specialty areas within the field of biomedical engineering are: bioinstrumentation; biomaterials; biomechanics; cellular, tissue and genetic engineering; clinical engineering; medical imaging; orthopaedic surgery; rehabilitation engineering; and systems physiology.
Bioinstrumentation is the application of electronics and measurement techniques to develop devices used in diagnosis and treatment of disease. Computers are an essential part of bioinstrumentation, from the microprocessor in a single-purpose instrument used to do a variety of small tasks to the microcomputer needed to process the large amount of information in a medical imaging system.
Biomaterials include both living tissue and artificial materials used for implantation. Understanding the properties and behavior of living material is vital in the design of implant materials. The selection of an appropriate material to place in the human body may be one of the most difficult tasks faced by the biomedical engineer. Certain metal alloys, ceramics, polymers, and composites have been used as implantable materials. Biomaterials must be nontoxic, non-carcinogenic, chemically inert, stable, and mechanically strong enough to withstand the repeated forces of a lifetime. Newer biomaterials even incorporate living cells in order to provide a true biological and mechanical match for the living tissue.
Biomechanics applies classical mechanics (statics, dynamics, fluids, solids, thermodynamics, and continuum mechanics) to biological or medical problems. It includes the study of motion, material deformation, flow within the body and in devices, and transport of chemical constituents across biological and synthetic media and membranes. Progress in biomechanics has led to the development
of the artificial heart and heart valves, artificial joint replacements, as well as a better understanding of the function of the heart and lung, blood vessels and capillaries, and bone, cartilage, intervertebral discs, ligaments and tendons of the musculoskeletal systems.
Cellular, Tissue and Genetic Engineering involve more recent attempts to attack biomedical problems at the microscopic level. These areas utilize the anatomy, biochemistry and mechanics of cellular and sub-cellular structures in order to understand disease processes and to be able to intervene at very specific sites. With these capabilities, miniature devices deliver compounds that can stimulate or inhibit cellular processes at precise target locations to promote healing or inhibit disease formation and progression.
Clinical Engineering is the application of technology to health care in hospitals. The clinical engineer is a member of the health care team along with physicians, nurses and other hospital staff. Clinical engineers are responsible for developing and maintaining computer databases of medical instrumentation and equipment records and for the purchase and use of sophisticated medical instruments. They may also work with physicians to adapt instrumentation to the specific needs of the physician and the hospital. This often involves the interface of instruments with computer systems and customized software for instrument control and data acquisition and analysis. Clinical engineers are involved with the application of the latest technology to health care.
Medical Imaging combines knowledge of a unique physical phenomenon (sound, radiation, magnetism, etc.) with high speed electronic data processing, analysis and display to generate an image. Often, these images can be obtained with minimal or completely noninvasive procedures, making them less painful and more readily repeatable than invasive techniques.
Orthopaedic Bioengineering is the specialty where methods of engineering and computational mechanics have been applied for the understanding of the function of bones, joints and muscles, and for the design of artificial joint replacements. Orthopaedic bioengineers analyze the friction, lubrication and wear characteristics of natural and artificial joints; they perform stress analysis of the musculoskeletal system; and they develop artificial biomaterials (biologic and synthetic) for replacement of bones, cartilages, ligaments, tendons, meniscus and intervertebral discs. They often perform gait and motion analyses for sports performance and patient outcome following surgical procedures. Orthopaedic bioengineers also pursue fundamental studies on cellular function, and mechano-signal transduction.
Rehabilitation Engineering is a growing specialty area of biomedical engineering. Rehabilitation engineers enhance the capabilities and improve the quality of life for individuals with physical and cognitive impairments. They are involved in prosthetics, the development of home, workplace and transportation modifications and the design of assistive technology that enhance seating and positioning, mobility, and communication. Rehabilitation engineers are also developing hardware and software computer adaptations and cognitive aids to assist people with cognitive difficulties.
Systems Physiology is the term used to describe that aspect of biomedical engineering in which engineering strategies, techniques and tools are used to gain a comprehensive and integrated understanding of the function of living organisms ranging from bacteria to humans. Computer modeling is used in the analysis of experimental data and in formulating mathematical descriptions of physiological events. In research, predictor models are used in designing new experiments to refine our knowledge. Living systems have highly regulated feedback control systems that can be examined with state-of-the-art techniques. Examples are the biochemistry of metabolism and the control of limb movements.
These specialty areas frequently depend on each other. Often, the biomedical engineer who works in an applied field will use knowledge gathered by biomedical engineers working in other areas. For example, the design of an artificial hip is greatly aided by studies on anatomy, bone biomechanics, gait analysis, and biomaterial compatibility. The forces that are applied to the hip can be considered in the design and material selection for the prosthesis. Similarly, the design of systems to electrically stimulate paralyzed muscle to move in a controlled way uses knowledge of the behavior of the human musculoskeletal system. The selection of appropriate materials used in these devices falls within the realm of the biomaterials engineer.
Examples of Specific Activities
Work done by biomedical engineers may include a wide range of activities such as:
Artificial organs (hearing aids, cardiac pacemakers, artificial kidneys and hearts, blood oxygenators, synthetic blood vessels, joints, arms, and legs).
Automated patient monitoring (during surgery or in intensive care, healthy persons in unusual environments, such as astronauts in space or underwater divers at great depth).
Blood chemistry sensors (potassium, sodium, O2, CO2, and pH).
Advanced therapeutic and surgical devices (laser system for eye surgery, automated delivery of insulin, etc.).
Application of expert systems and artificial intelligence to clinical decision making (computer-based systems for diagnosing diseases).
Design of optimal clinical laboratories (computerized analyzer for blood samples, cardiac catheterization laboratory, etc.).
Medical imaging systems (ultrasound, computer assisted tomography, magnetic resonance imaging, positron emission tomography, etc.).
Computer modeling of physiologic systems (blood pressure control, renal function, visual and auditory nervous circuits, etc.).
Biomaterials design (mechanical, transport and biocompatibility properties of implantable artificial materials).
Biomechanics of injury and wound healing (gait analysis, application of growth factors, etc.).
Sports medicine (rehabilitation, external support devices, etc.).
Where do Biomedical Engineers Work?
Biomedical engineers are employed in universities, in industry, in hospitals, in research facilities of educational and medical institutions, in teaching, and in government regulatory agencies. They often serve a coordinating or interfacing function, using their background in both the engineering and medical fields. In industry, they may create designs where an in-depth understanding of living systems and of technology is essential. They may be involved in performance testing of new or proposed products. Government positions often involve product testing and safety, as well as establishing safety standards for devices. In the hospital, the biomedical engineer may provide advice on the selection and use of medical equipment, as well as supervising its performance testing and maintenance. They may also build customized devices for special health care or research needs. In research institutions, biomedical engineers supervise laboratories and equipment, and participate in or direct research activities in collaboration with other researchers with such backgrounds as medicine, physiology, and nursing. Some biomedical engineers are technical advisors for marketing departments of companies and some are in management positions.
Some biomedical engineers also have advanced training in other fields. For example, many biomedical engineers also have an M.D. degree, thereby combining an understanding of advanced technology with direct patient care or clinical research.
Where are biomedical engineers employed, what are the salaries and what is the future demand?
In 2009, the Bureau of labor Statistics found that there were 14,760 biomedical engineers working in the US (www.bls.gov/oes/current/oes172031.htm). They estimate employment growth of 72 percent over the net decade, much faster than the average for all occupations. The aging of the population and a growing focus on health issues will drive demand for better medical devices and equipment designed by biomedical engineers. Along with the demand for more sophisticated medical equipment and procedures, an increased concern for cost-effectiveness will boost demand for biomedical engineers, particularly in pharmaceutical manufacturing and related industries.
Median annual earnings of biomedical engineers were $78,860 in 2009. The middle 50 percent earned between $60,980 and $100,890. Major categories of employment include 3,440 were employed in medical equipment and supplies manufacturing, 2,680 in scientific research and development and 2,410 in pharmaceutical and medicine manufacturing.
How Can I Reach a Biomedical Engineer to Discuss Career Issues?
Individuals interested in a career in biomedical engineering should contact the program director or faculty member at a nearby college or university with a program in biomedical engineering. A list of academic programs is available at www.whitaker.org. If students are not aware of any schools in their state or region, they can also contact BMES headquarters for this information at www.bmes.org.
How Should I Prepare for a Career in Biomedical Engineering?
The biomedical engineering student should first plan to become a good engineer who then acquires a working understanding of the life sciences and terminology. Good communication skills are also important, because the biomedical engineer provides a vital link with professionals having medical, technical, and other backgrounds.
High school preparation for biomedical engineering is the same as that for any other engineering discipline, except that life science course work should also be included. If possible, Advanced Placement courses in these areas would be helpful. At the college level, the student usually selects engineering as a field of study, then chooses a discipline concentration within engineering. Some students will major in biomedical engineering, while others may major in chemical, electrical, or mechanical engineering with a specialty in biomedical engineering. As career plans develop, the student should seek advice on the degree of specialization and the educational levels appropriate to his or her goals and interests. Information on sources of financial aid for education and training should also be sought. Many students continue their education in graduate school where they obtain valuable biomedical research experience at the Masters or Doctoral level. When entering the job market, the graduate should be able to point to well defined engineering skills for application to the biomedical field, with some project or in-the-field experience in biomedical engineering.
How Do I Select a Biomedical Engineering Academic Program?
There is no easy answer to this question, but potential biomedical engineering students can begin their search by first looking into programs in their own state or region. Due to the growth of academic programs in this profession, many individuals can find a good program nearby.
One question to consider is the philosophy or focus of the academic program. Some programs emphasize research while others may emphasize more design projects with an orientation toward industrial careers. Students should ask about the curriculum as well as the placement experience of recent graduates.
Biomedical Engineering Programs Offer BS, BA, BSE, and BE Undergraduate Degrees. What is the Difference Between the Various Degrees Offered in this Field?
The different degree names offered in biomedical engineering reflect more a preference of the academic institution rather than any substantive difference in the curriculum or academic credential. Each of these degrees has essentially the same value as an academic credential aside from the reputation of the biomedical engineering program and the university.
How Important is ABET Accreditation?
Another issue to consider is accreditation. Accreditation is a process involving conformity assurance by an independent review body verifying that academic programs or institutions have met agreed upon standards of quality and performance in a specific profession. The American Board for Engineering and Technology, Inc. (ABET) is the official accreditation body for biomedical engineering programs in the United States. The current list of accredited biomedical engineering/bioengineering programs can be found at the ABET website www.abet.org/AccredProgramSearch/AccreditationSearch.aspx and entering "bioengineering and biomedical engineering" under program areas. Prospective students can review ABET accreditation criteria and determine whether they want to limit their search to accredited programs.
Accreditation is always desirable in any academic program geared toward training professionals. Also, current licensure requirements require graduation from an accredited program as a prerequisite requirement for the Professional Engineer (PE) license. It should be noted however, that licensure issues are currently not as important in biomedical engineering as they are in other areas such as civil engineering where permits and legal documents require signatures from a PE. The importance of licensure for Biomedical Engineers could, however, become more important in the future.
It should be noted that BMES is an official ABET participating body and the lead society for biomedical engineering and bioengineering.
What are Some Little Known Facts About Biomedical Engineering?
Biomedical engineers play a significant role in mapping the human genome, robotics, tissue engineering, and in nanotechnology.
Biomedical engineering has the highest percentage of female students in all of the engineering specialties.
30% of biomedical engineering graduates are employed in manufacturing.
Many biomedical engineering graduates go on to medical school. The percentage of students applying to medical school is as high as 50% in some programs.
There are 15 chapters of the national biomedical engineering honor society, Alpha Eta Mu Beta, located on college campuses throughout the United States.
BMES has more than 132 student chapters on college and university campuses.
Judith A. Resnick, PhD, a U.S. astronaut who died when Challenger exploded in 1986, was a biomedical engineer working at NIH from 1974 to 1977.
Willem Kolff, MD PhD, a biomedical engineer and physician, designed early artificial hearts and the first kidney dialysis machine. He supervised the first implanted artificial heart into Barney Clark, and his latest work is on a portable artificial lung.
The National Institutes of Health has a new institute for biomedical engineering and imaging. The Institute (NIBIB) coordinates with the biomedical imaging and bioengineering programs of other agencies and NIH Institutes to support imaging and engineering research with potential medical applications and facilitates the transfer of such technologies to medical applications.
A single U.S. foundation, the Whitaker Foundation in Arlington, Virginia, has made significant contributions to the development of this profession. Whitaker Foundation grants more than doubled the number of biomedical engineering academic programs in the United States by adding 38 new departments in this field.
(Courtesy of bmes.org)
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