Classifications of Patient Leakage for Medical Equipment скачать в хорошем качестве

Classifications of Patient Leakage for Medical Equipment

Achieving CF Leakage Introduction Leakage current is a type of non-functional current that flows through an electrical device, even when the power to it is turned off. It can also contribute to wasted energy and can pose a personal safety hazard. Several types of leakage current have been defined: Earth, Enclosure, and Patient. Patient leakage current flows from the applied part of a medical device through a patient to the ground and can result in a waste of energy and be dangerous to human life. IEC 60601-1 standard, for power supplies, outlines the necessary guidelines medical devices need to meet to ensure patient safety. Protecting against shock is particularly important for medical patients, who might have weakened immune systems and are at an increased risk of physical harm from an electrical shock. What is an applied part? An applied part is a piece of medical equipment that comes into contact with a patient. The IEC 60601-1 standard classifies applied parts into three categories based on the type of contact they have with a patient and the type of device. Those medical equipment types are B, BF, and CF. Type B Body or Type B parts are usually not conducive. Type B is the least stringent of the three classifications, as the part is often something that a patient can let go of easily and may not even be able to reach at all. Examples of Type B applied parts include magnetic resonance imaging (MRI) scanners, lasers, phototherapy equipment, and hospital beds. Type BF A body floating or Type BF parts allow a patient leakage of up to 100uA and may have some conductive contact with a patient, which is either long-term or medium contact. Examples of devices that fall under the Type BF classification include ultrasound equipment, incubators, and blood pressure cuffs. Type CF Cardiac floating requirements are the strictest of the applied parts classifications, allowing only up to 10uA of patient leakage. Any parts that come into contact with the heart or bloodstream are classified as Type CF. Examples of Type CF include dialysis, LVAD, or artificial heart and surgical equipment. Conclusion Since the risk of physical harm to a person is greatest when an applied part is in contact with their heart or bloodstream, the limits are considerably lower for power supplies in parts that fall under the Type CF classification. CF leakage can be achieved a few ways in the medical device, the benefits of using a CF AC-DC power supply is usually overall smaller system size, weight, component count and cost. If your system requires (CF) leakage, please consider one of Astrodyne TDI’s (CF) AC-DC power supplies, we have both Class I and Class II input options with Class B EMC compliance for use even with Home Use medical equipment where IEC 60601-1-11 is also required. Contact our team of experts by visiting our website at www.AstrodyneTDI.com