EMI Shielding in Medical Devices

EMI SHIELDING SOLUTION IN MEDICAL

SEQUENCING ANALYSIS

Lid/access panel sealing

Shielding Type	Application	Features	Benefits
Conductive foam	Module covers	• Very soft and conformable • Provided in cut parts • Provided with conductive adhesive backing	• Low closure force • Adhesive backing aids assembly • Provides shielding on cover
Knitted mesh with environmental seal	Enclosure body seams	• Soft and conformable • Provides environmental and EMI seal • Adhesive backing on environmental part	• Low closure force • Combined EMI and environmental seal • Adhesive backing aids assembly
Conductive fabric-overfoam	Enclosure	• Soft and conformable • Adhesive backing • Wide range of profiles • Can be fabricated into a gasket	• Low closure force • Adhesive backing aids assembly

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MASS SPECTROMETRY

Shielding Type	Application	Features	Benefits
Oriented wire in silicone	Connector	• High EMI shielding performance • Reliable low surface contact resistance	• provides shielding on the connector interface • Supplied as cut gasket
Conductive fabric over foam	Enclosure and access panels	• Soft and conformable • Adhesive backing to aid assembly • Supplied in standard lengths and cut to length during assembly	• Low closure force • Takes up wide tolerances • Supplied as standard strip, easily cut to various lengths during assembly
Conductive foam	Internal shielding	• Soft and conformable • Provided as a cut flat gasket • Conductive adhesive backing to aid assembly	• Low closure force • Provided as cut part to fit directly into assembly • Provides internal shielding within unit
Silicone sponge	Environmental sealing	• Soft and conformable • Bespoke flat gaskets to provide sealing in key areas • Adhesive backing to aid assembly	• Low closure force • Supplied as pre-cut bespoke seals to fit directly into the assembly.

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INFUSION PUMP

EMI Solution	Application	Key Product Features	Benefits
Conductive Elastomer O-Ring	•Enclosure •Communication Pod	• Conductive elastomers can provide great EMI shielding performance at a relatively low cost • Range of different materials and profiles available to suit the application including a UL94-V0 material"	• Material options to provide required EMI performance and galvanic compatibility • Provide low contact resistance between connector and enclosure
Conductive Gasket	• Sensor • Power Supply		• Ensures additional electrical bonding between the surfaces with a very low contact resistance
Non-conductive Environmental Seal O-Ring	• Housing Flow stop	• The groove also forms a compression stop for the O-Ring gasket	• Provides an environmental seal by achieving metal to metal contact Moisture or pressure sealing
Conductive Elastomers	• Communication Pod	• Fully cured silicones or fluorosilicone loaded with a variety of highly conductive particles providing superior EMI/RFI shielding performance combined with excellent environmental sealing	• Ensure complete electrical conductivity is maintained across the joint • Ensure galvanic compatibility whilst providing low contact resistance between mating surfaces

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VENTILATOR

Interruption in medical device performance such as ventilator can be the difference between life and death. Without proper EMI shielding, medical devices, including life-support systems and essential monitoring equipment are vulnerable to signal noise, damage, or total functional impairment.

A ventilator that doesn’t meet prescribed emission limits can lead to various unfavorable consequences for other medical devices: Potential Equipment Shutdown: In the worst-case scenario, the non-compliant ventilator might unexpectedly shut down, a critical issue when it’s supposed to operate continuously, 24/7.

Intermittent Failures: Such non-compliance can result in intermittent failures, disrupting normal device operation. Identifying and troubleshooting the source of electromagnetic interference (EMI) disturbances can be time-consuming and challenging. These intermittent failures could lead to the malfunction of essential features like alarms, lights, motors, displays, and LED indicators during crucial moments.

Metastable Logic: Another consequence could be the occurrence of metastable logic, typically caused by a logic gate getting stuck between states 0 and 1. This can trigger a firmware error, necessitating a manual restart of the machine.

	Application	Features	Benefits
Connector Gasket	• Air Filter Cover	• Offering a wide range of standard MIL connector gaskets. Different materials are available to meet the demands of EMI shielding, environmental sealing, galvanic compatibility and fuel /oil resistance.	• Ensures electrical bonding between the surfaces with a very low contact resistance
Conductive o ring	• LCD Display	• Termination of the EMI Shield windows to the enclosures is achieved with a continuous low resistance conductive edge around the window	• providing optimum transparency and EMI shielding.
Fabric over foam	• PCB	• Soft and conformable, low closure force • Available with adhesive backing • Available in many profile options	• Grounding
Knitted Wire Mesh	• Enclosure	• The mono-filament interlocking loop construction gives strength while allowing it to confirm to almost any size or shape. • A selection of elastomer cores are available to meet conditions such as temperature range, compression set, compression force.	• Delivers good galvanic match with mating flanges, thereby limiting the possibility of corrosion between gasket and flange. • Excellent radio frequency interference (RFI)/electromagnetic interference (EMI) shield between two metallic surfaces.

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