Medical Electronics Symposium Conference Proceedings


Author: James J. Fagan
Company: GE Plastics
Date Published: 5/3/2007   Conference: Medical Electronics Symposium

Abstract: The effect of electromagnetic interference (EMI) on modern electronics has been a concern for many years. This is particularly true in the healthcare industry, where hospitals and other healthcare service environments employ a range of critical and non-critical electro medical equipment, such as patient monitoring, and delivery devices, as well as clinical diagnostic, imaging and analytical laboratory equipment. The healthcare service environment has become increasingly electromagnetically challenging as various types of electro medical equipment must co-exist as well as be immune to consumer and industrial electronic equipment that it may come into proximity with. As a result the Food and Drug Administration, has becoming increasingly concerned about the electromagnetic compatibility (EMC) of electro medical equipment. They are requiring assurance from manufacturers that they have addressed EMC concerns during the design process, and that such devices will operate properly in their intended environments.

Designing electro medical devices to meet the EMC performance requirements can be achieved in a number of ways, including the use of enclosures or housings with electromagnetic shielding capabilities. Properly designed, such shields can provide emission and immunity protection to electromagnetic signals. There are a variety of shield material options, including melt process able conductive thermoplastic composites that offer intrinsic shielding. This paper presents information on these composites and their use as electromagnetic shields. Shielding models, product performance features along with design and processing information critical to delivering effective shielding will be discussed.

Key words: electromagnetic shielding, conductive thermoplastics, electromagnetic compatibility

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