Background image with a man using a drill

Boston Scientific CRT-D and CRT-P devices are designed to work properly around most appliances and tools. However, some appliances and tools may affect how your device works. While these effects are usually temporary, we recommend using the following guidelines for safe interaction with many common household items.

Important to Know

  • Your device has built-in features that protect it from interference from most electrical or wireless household items.
  • Some electrical and wireless items must be kept a certain distance away from your implanted device to avoid interaction with your device.

What is EMI?

All items that use electricity or transmit wireless signals have invisible electromagnetic fields around them that may temporarily interfere with your CRT device's normal operation. This is called electromagnetic interference, or EMI for short.

Boston Scientific CRT devices have built-in features that protect them from EMI from most household items. However, some items must be kept a certain distance from your device. And others, should not be used at all. Learn more about the safety of various items below.

EMI Compatibility Guide
Quick Guide to EMI in Office, Shop, and Yard
Quick Guide to EMI at Home
Quick Guide to EMI with Personal Entertainment
Living in a World of Electromagnetic Interference (EMI)

Safe Under Normal Use

The following household items are generally safe to use with an CRT-P or CRT-D as long as they are in good working condition and used as intended:
  • Air purifiers
  • Blenders
  • CD/DVD Players
  • Clothes washing machines
  • Electric blankets
  • Electric can openers
  • Electric invisible fences
  • Electric toothbrushes
  • Fax/copy machines
  • Hair dryers
  • Heating pads
  • Hot tubs/whirlpool baths
    NOTE: Consult with your doctor before using a hot tub. While a hot tub will not harm your implanted device, your medical condition may not permit this activity.
  • Laser tag games
  • Microwave ovens
  • Ovens (electric, convection, or gas)
  • Pagers
  • Patient alert devices
  • Personal computers
  • Personal digital assistants (PDAs)
    NOTE: PDAs that also function as cell phones should be kept at least 6 inches away from your CRT-P or CRT-D.
  • Portable space heaters
  • Radios (AM and FM)
  • Remote controls (TV, garage door, stereo, camera/video equipment)
  • Stoves (electric or gas)
  • Tanning beds
  • Televisions
  • TV or radio towers (safe outside of restricted areas)
  • Vacuum cleaners
  • VCRs
  • Video games

Safe to Use with Extra Precautions

If you use any of the following items, it’s important to keep them the recommended distance away from your implanted device to avoid interaction.

Items that should not be placed directly over your CRT-P or CRT-D, but are otherwise safe to use:

  • Cordless (household) telephones
  • Electric razors
  • Hand-held massagers
  • Portable MP3 and multimedia players (such as iPods®) that do not also function as a cellular phone
    NOTE: While portable MP3 players themselves should not interfere with your CRT-P or CRT-D, the headphones or earbuds should be stored at least 6 inches (15 cm) away from your device and you should avoid draping the headphones around your neck.

Items that should remain at least 6 inches (15 cm) away from your CRT-P or CRT-D:

  • Cellular phones, including PDAs and portable MP3 players with integrated cellular phones
  • Devices transmitting Bluetooth® or Wi-Fi signals (cellular phones, wireless Internet routers, etc.)
  • Headphones and earbuds
    NOTE: It is safe to use headphones and earbuds, but you should refrain from draping them around your neck and from storing them in a breast or other shirt pocket.
  • Magnetic wands used in the game of Bingo

Items that should remain at least 12 inches (30 cm) away from your CRT-P or CRT-D:

  • Battery-powered cordless power tools
  • Chainsaws
  • Corded drills and power tools
  • Lawn mowers
  • Leaf blowers
  • Remote controls with antennas
  • Shop tools (drills, table saws, etc.)
  • Slot machines
  • Snow blowers
  • Stereo speakers

Items that should remain at least 24 inches (60 cm) away from your CRT-P or CRT-D:

  • Arc welders
  • CB and police radio antennas
  • Running motors and alternators, especially those found in vehicles
    NOTE: Avoid leaning over running motors and alternators of a running vehicle. Alternators create large magnetic fields that can affect your implanted device. However, the distance required to drive or ride in a vehicle is safe.

Using Cellular Phones Safely

Your cellular phone is a source of EMI and could affect your CRT-P or CRT-D's operation. This interaction is temporary, and moving the phone away from your device will return it to proper function. To reduce the chance of interaction, follow these precautions:

  • Maintain a distance of at least 6 inches (15 cm) between the cell phone and your device. If the phone transmits more than 3 watts, increase the distance to 12 inches (30 cm).
  • Hold the cellular phone to your ear on the opposite side of your body from your CRT-P or CRT-D.
  • Do not carry a cell phone in a breast pocket or on a belt if that places the phone within 6 inches (15 cm) of your device.

These precautions apply only to cell phones, not to household cordless phones. However, you should avoid placing your household cordless phone receiver directly over your CRT-P or CRT-D device.


NOT Safe for Use

The following items are NOT safe to use if you have a CRT-P or CRT-D device:

  • Body-fat measuring scales
  • Jackhammers
  • Magnetic mattresses and chairs
  • Stun guns

Resources and Support


We're Here to Help

Our patient support team is happy to help answer all your questions about living with your device.

Phone: (866) 484-3268
Hours: M-F 8:00 a.m. - 5:00 p.m. Central

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