Topics and Professional Development
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Item Adapting and Replacing Regulators(EWH, 2018)A voltage regulator maintains a constant voltage level. Two common DC voltage regulators are linear regulators and switching regulators. Linear regulators continuously adjust to changes at the input to maintain a constant output voltage level. Switching regulators continuously switch the input voltage on and off to maintain a constant output voltage level. A third regulator is a shunt regulator. Shunt regulators begin conducting at a specified voltage and will conduct as much current as is required to maintain that specified voltage. This skill will discuss linear DC voltage regulators.Item Adapting Wall Transformer(EWH, 2018)A transformer is a device that changes electrical energy from one voltage to another voltage. Step up transformers increase the voltage. Step down transformers decrease the voltage. Wall transformers can also change alternating current (AC) into direct current (DC). Wall transformers turn electricity from an electrical wall outlet into an appropriate voltage and current for a device or machine. This unit explains how to find a replacement wall transformer or to adapt one to suit your needs.Item Adding proper grounding(EWH, 2018)Proper grounding is very important. The ground connection increases safety for the patient, technician, and device. The instruments are powered through wall power terminals. Wall power terminals have provisions for providing grounding. Some medical equipment will not work properly if the power outlet is not grounded. These devices use the ground to help reduce noise.Item Arcing grooves in commutator with a lathe(2018)Friction between the copper segments of the commutator and the brushes eventually wears both surfaces. Older copper brushes can cause more wear to the commutator. The commutator surface may have deep grooves and notches that were caused by friction. The commutator on small motors is not designed to be repaired. This module describes the skill of removing the rotor from the frame and arcing the grooves using a lathe. This skill requires a lathe. You may need to find a repair facility in your city if you do not have a lathe.Item Arcing grooves in commutator with emery paper(EWH, 2018)Friction between the copper segments of the commutator and the brushes eventually wears both surfaces. Older copper brushes can cause more wear to the commutator. Copper brushes can cause deep grooves and notches on the surface over time. The commutator on small motors is not designed to be repaired. On large industrial equipment, the commutator may be re-surfaced with abrasives. Emery paper is like sandpaper. It can be used for sanding down hard and rough surfaces.Item Bent Shaft (Vibration and Wobbling)(EWH, 2018)A bent shaft increases motor vibration. A bent shaft can be responsible for the noisy operation of a motor. A bent shaft in motor should be corrected or replaced for proper operation of a motor.Item Biomedical Technician’s Assessment Instrument Package(Duke University, 2016)The Biomedical Technician’s Assessment Instrument Package includes the foundations of survey instruments, survey scripts, and reference materials used in the assessment of biomedical technician’s impact on hospitals in Honduras, Rwanda, and Cambodia. In these studies, impact was defined as the technician’s ability to decrease out-of-service medical equipment in the hospital. For each assessment, the instruments were tailored to the specific country program yet the fundamental questions, presented here, were always included to ensure comparability across countries and years. Demographic and technical information about the hospital is taken from the hospital, technician, and hospital administrators. The status of the medical equipment within five departments (operating theatres, radiology, emergency, maternal and neonatal intensive care, and clinical labs) is reported by the technician and the head of each department. A work history of corrective maintenance, preventative maintenance, and management actions were reported by the technicians. This package includes the instrument and the script for each of the seven fundamental surveys. The instrument was used during the survey while the script was used as a training tool for each interviewer and translator. The instrument was translated into the appropriate language and was given to the interviewee upon request.Item Blood Physiology(Wikibooks, 2006) Wikibooks ContributorsThe primary function of blood is to supply nutrients and constitutional elements to tissues and to remove waste products. Blood also enables cells and different substances to be transported between tissues and organs. Problems with blood composition or circulation can lead to downstream tissue malfunction. Blood is also involved in maintaining homeostasis by acting as a medium for transferring heat to the skin and by acting as a buffer system for bodily pH.Item BMET Algebra(CK-12 Foundation, 2011-02-20) Felder, Kenny; Gloag, Andrew; Krame, Melissa; Rawley, EveThis is a university level algebra textbook.Item BMET Geometry(CK-12 Foundation, 2011-02-01) Cifarelli, Victor; Fiori, Nick; Gloag, Andrew; Greenberg, Dan; Jordan, Lori; Sconyers, Jim; Zahner, BIllThis is a university level geometry textbook for BMETs.Item BMET Probability & Statistics(CK-12 Foundation, 2011-09-01) Meery, Brenda; Parsons, RichardThis is a university level probability and statistics textbook for BMETs.Item BMET Trigonometry(CK-12 Foundation, 2011-09-01) Fortgang, Art; Gloag, Andrew; Hayes, Andrea; Landers, Mara; Meery, Brenda; Ottman, Larry; Rawley, EveThis is a university level trigonometry textbook for BMETs.Item BOTTLED MEDICAL OXYGEN AND OXYGEN CONCENTRATORS(VSO, 1995) Skeet, Muriel; Fear, DavidBottled oxygen is supplied under pressure in specially designed steel cylinders of varying sizes. British Standard oxygen bottles range in capacity from 170 litres to 6800 litres.Item Brush frozen away from commutator (Cleaning)(EWH, 2018)An electric brush is part of a motor. DC motors have several spring-loaded brushes pushing against each side of the motor’s commutator. Electric brushes conduct electricity between the motor’s fixed wiring (stator) and the motor’s moving parts (rotor, commutator).Item Building a charger(EWH, 2018)Rechargeable batteries are common in medical equipment. Batteries convert chemical energy into electrical energy. This process can be reversed in rechargeable batteries, converting electrical energy into chemical energy. Once a battery is recharged, remove it from the charger. The battery can be damaged by overcharging. The best way to charge batteries is to add charge slowly.Item Building and Using a Continuity Tester(EWH, 2018)This skill is an introduction to basic circuit theory. First, you must understand that electricity only flows in a closed circuit. A closed circuit is a loop of materials that will conduct electricity. An open circuit is a loop that will not conduct electricity. A continuity tester helps to determine if a circuit is closed or open. Testing circuits is an essential skill for troubleshooting. A functioning continuity tester indicates continuity, sometimes called connectivity. The LED on the continuity tester will light when the test leads are connected to two points that are connected electrically. The LED will not light if the two points are not connected electrically.Item Cable Strain Relief(2018)Cable strain relief systems are important to protect the cable fiber at the plug or the connector. Cable strain relief systems are conical polymers that allow the fiber within the cable to bend, minimizing the stress where the cabling and the connector adjoin. Strain relief systems allow cable movement without damage to the insulation. Thus, the user is protected. Device life is extended. Strain relief is often provided by a series of ridges at point of cable attachment. This is called a strain relief boot. Cable strain relief provides extra protection to cables and wiring, and extends cord life.Item Calibrating Sphygmomanometers(EWH, 2018)A blood pressure (BP) apparatus or sphygmomanometer is a medical device. A BP apparatus measures the vital sign of blood pressure. A BP apparatus has two parts: an inflatable cuff and a manometer. The inflatable cuff restricts blood flow to the arm. The manometer is aneroid or mercury. The manometer measures the pressure in the cuff. Blood pressure is measured in millimeters of mercury (mm Hg). A valve controls the pressure in the cuff. Close the valve to increase pressure. Open the valve to release the pressure.Item Calibration Basics(EWH, 2018)Calibration compares an instrument’s output against an accurate standard. Once an error is known, any deviations can be corrected. For example, a thermometer could be calibrated and adjusted to show the true temperature in Celsius. For medical devices, any output that will reach the patient (fluid flow, pressure, electrical current, etc) or measurement from the patient (temperature, heart rate, blood pressure, etc) needs to be calibrated periodically. Calibration is important for patient safety and accurate diagnosis and treatment.Item Calibration of Non-Invasive Blood Pressure (NIBP) Machine(EWH, 2018)A non-invasive blood pressure machine is a medical device used to measure blood pressure. A non-invasive blood pressure machine is electric. A non-invasive blood pressure machine consists of an inflatable cuff and an electric manometer. The inflatable cuff restricts blood flow to the arm. The electric manometer displays the blood pressure reading. Blood pressure is measured in millimeters of mercury (mm Hg). A non-invasive blood pressure machine does not require a stethoscope.