EMI Shielding & Thermal Management Solutions for Medical Devices

April 30, 2020

As electronic medical devices have become increasingly complex and diversified, so has engineers’ need for advanced electromagnetic interference (EMI) shielding and thermal interface materials (TIM) to protect those devices.

Zatkoff Seals & Packings provides advanced integrated solutions for medical devices through Parker Chomerics, offering proven solutions in EMI shielding and grounding, thermal management, integrated display, conductive plastic injection molding, and safety testing.

1

Battery/Power Supply

  • SOFT-SHIELD© conductive foam EMI gaskets on battery backup for grounding
  • THERM-A-GAP© GEL thermal interface dispensable gel for heat transfer
  • THERM-A-GAP© PAD thermal interface gap filler pads
2

Printed Circuit Board

  • SPRING-LINE™ fingerstock gasket grounding clips
  • THERM-A-GAP© GEL thermal interface gel for heat transfer
  • THERM-A-GAP© PAD thermally conductive gap filler pads for radiating heat away from PCB
  • CHO-FORM© form-in-place EMI gasket enclosure to PCB
  • CHO-SHIELD© EMI and RF coatings for board level shielding on PCB
3

Cables/Connectors

  • CHO-SEAL© custom EMI gaskets
  • CHO-SHRINK© heat shrinkable EMI shielding cable tubing
  • SOFT-SHIELD© conductive foam EMI shielding gaskets
4

Screen/Windows

  • CHO-TOUCH© touchscreen provides EMI shielding with valuable IR blocking, privacy screen, and anti-fogging properties
5

Enclosure

  • CHO-SEAL© extruded elastomer EMI gasket as cover seal for shielding and moisture barrier
  • Rear half of enclosure is made from PREMIER™ conductive thermoplastic for EMI shielding
  • CHO-SHIELD© EMI shielding paint coating for plastic on back of enclosure
  • SPRING-LINE™ fingerstock spring finger gasket
  • SOFT-SHIELD© conductive foam EMI

Parker Chomerics Solutions

Parker Chomerics solutions are utilized in a variety of medical devices, including Imaging & Diagnostics and Life-Critical & Patient Monitoring.

Imaging & Diagnostics

EMI shielding gaskets from Parker Chomerics provide necessary radio frequency (RF) shielding to prevent RF noise from entering an MRI scanner, which can distort images and disrupt external medical devices. RF shields contain various components — doors, windows, ceilings, floors, and walls — that work together as a barrier to items penetrating the shield and reduce RF noise to acceptable levels.

Trusted Chomerics solutions for imaging and diagnostics include:

  • X-Ray Machines
  • MRI Rooms
  • Ultrasound
  • Medical Ultrasonography
  • DEXA
  • CT
  • Mammography
  • Stereotactic Breast Biopsy
6

EMI Shielded Touchscreen Displays

  • CHO-TOUCH™ EMI Shielded Touchscreens combine today's state of the art touchscreen technologies (PCAP and Resistive) with our industry leading EMI shielding expertise

Life-Critical & Patient Monitoring

Sophisticated life-critical medical devices, including ventilators and anesthesia delivery systems, must run properly and reliably at any given moment. EMI suppression and thermal management technology is vital in order to protect electrical components within a variety of life sciences applications.

Chomerics products are used in a variety of life-critical and patient monitoring equipment, including:

  • Anesthesia Delivery
  • Plasma Collection Systems
  • Ventilators
  • Vital Signs Monitoring
  • Medical Gas Analyzers
  • Continuous Blood Glucose Monitoring
  • Display Housings
  • Defibrillators
7

Thermal Interface Materials (TIM)

  • THERM-A-GAP™ GEL 30 easily dispensable thermal material for critical electronics cooling
8

EMI Shielded Display

  • WIN-SHIELD™ Micromesh is used for protecting EKG window
  • Added AR coating
  • Screen printed overlay
9

Conductive Coating for Plastic Enclosure

  • CHO-SHIELD© 2056 conductive paint on back of plastic enclosure for added EMI protection

Zatkoff Seals & Packings can assist you with determining the best Parker Chomerics solution for your needs, working within the parameters of your design and component requirements. We offer a wealth of customizable solutions that meet or exceed your specifications and expectations to keep your life-saving equipment operating when you need it most. Contact us to learn more about our innovative life sciences solutions.

Featured Parker Chomerics Products

Gaskets for shielding of enclosures of electronics such as displays, flanges, and components.

Product Conductive Filler Binder Shielding Effectiveness Corrosion
CHO-SEAL® 6502 Nickel-Aluminum Silicone Excellent Excellent
CHO-SEAL® 6503 Nickel-Aluminum Fluorosilicone Excellent Excellent
CHO-SEAL® 1298 Silver-Aluminum Fluorosilicone Good Very Good
CHO-SEAL® 1285 Silver-Aluminum Silicone Very Good Good
CHO-SEAL® S6305 Nickel-Graphite Silicone Good Fair
CHO-SEAL® 6370 Nickel-Graphite Silicone Fair Fair
CHOFORM® 5513 Silver-Copper Silicone Excellent Not Recommended
CHOFORM® 5528 Silver-Copper Silicone Excellent Not Recommended

SOFT-SHIELD® fabric-over-foam gaskets provide excellent performance with very low closure force due to the soft urethane foam construction.

Product Compression Set Shielding Effectiveness Temperature Range Flammability Rating
  %   °C  
SOFT-SHIELD® 3500 < 15 Excellent -40–70 UL 94 V-0
SOFT-SHIELD® 3700 < 10 Excellent -40–125 ASTM D3574
SOFT-SHIELD® 4850 < 15 Good -40–70 UL 94 V-0

Conductive plastics eliminate 35% of the housing weight (as compared to aluminum) and reduce costs by 65%, while providing excellent hydrolysis resistance.

Product Filler Level Surface Resistance Shielding Effectiveness Flammability Rating
    ohm/sq    
PREMIER™ A220-HT Low 4.50 Good
PREMIER™ A240-ST High 0.20 Excellent
PREMIER™ A240-FRHF High 0.25 Excellent UL 94 V-0
PREMIER™ PEI 140 High 0.45 Excellent UL 94 V-0
PREMIER™ PBT-225 Medium 10.0 Excellent UL 94 H-B

Conductive paints designed to be applied to the inside of plastic electronic enclosures help shield critical medical equipment from damaging EMI.

Product Conductive Filler Polymer Family Shielding Effectiveness Temperature Range
        °C
CHO-SHIELD® 2044 Nickel Acrylic Good -40–85
CHO-SHIELD® 2056 Silver-Plated Copper Acrylic Excellent -40–85
CHO-SHIELD® 2040 Silver Acrylic Excellent -40–85

THERM-A-GAP™ thermally conductive dispensable gels are pre-cured, single-component compounds that can be robotically dispensed on the heat-generating component.

Product Thermal Conductivity Product Type Flow Rate Flammability Rating
  W/m-K   g/min  
THERM-A-GAP™ GEL 8010 3.0 1-Part 60 UL 94 V-0
THERM-A-GAP™ GEL 30 3.5 1-Part 20 UL 94 V-0
THERM-A-GAP™ GEL 45 4.5 1-Part 55 UL 94 V-0
THERM-A-GAP™ TC50 5.0 1-Part 10 UL 94 V-0

THERM-A-GAP™ thermally conductive silicone and non-silicone gap filler pads are for applications where heat must be conducted over a large and variant gap.

Product Thermal Conductivity Thermal Impedance Hardness Flammability Rating
  W/m-K °C-cm2W Shore OO  
THERM-A-GAP™ HCS10 1.0 9.7 4 UL 94 V-0
THERM-A-GAP™ 569 1.5 9.1 10 UL 94 V-0
THERM-A-GAP™ 579 3.0 4.5 30 UL 94 V-0
THERM-A-GAP™ G974 5.0 3.3 86 UL 94 V-0
THERM-A-GAP™ 974 6.0 2.9 86
THERM-A-GAP™ 976 6.5 1.9 55 UL 94 V-0

THERM-A-FORM™ thermally conductive elastomer products are dispensable form-in-place compounds designed for heat transfer without excessive compressive force.

Product Features Thermal Conductivity Product Type Hardness
    W/m-K   Shore A
THERM-A-FORM™ T646 Provides combination of high thermal performance and low cost 0.9 2-Part 50
THERM-A-FORM™ T647 Superior thermal performance while maintaining low modulus 3.0 2-Part 25
THERM-A-FORM™ 1641 One component, moisture cure, non-acetic acid generating 0.9 1-Part 56

Touchscreen, window, and LCD solutions for human interface life science applications providing turnkey solutions with integrated assemblies aids in fast design cycles and fast to market product development cycles.

Product Features
CHO-TOUCH™ Integrated LCD/touch display solutions with optional custom cover glass and EMI shielding
Integrated Solutions Custom plastic or metal housing sub assemblies with specified displays, touchscreens, covers, supply chain components
WIN-SHIELD™ P Laminated plastic EMI shielded covers with optional embedded screen printed graphics
WIN-SHIELD™ G Laminated or coated glass EMI shielded covers with optional embedded screen printed graphics
Duralan™ P Laminated plastic display/touchscreen covers with optional embedded graphics, display enhancements

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