Meet Micra

Micra® is the world's smallest pacemaker.1 It leaves no bump under the skin, no chest scar, and requires no lead or lead wire. This cardiocapsule is completely self-contained within the heart and provides the therapy needed without a visible reminder of a medical device.

Why is Micra Different?

Traditional Pacing System
Most pacemakers require a device to be surgically implanted under the skin in the upper chest. The system also requires a lead to be connected to the pacemaker and threaded into the heart. The pacing lead carries electrical signals from the pacemaker to the heart to help it beat regularly.

Micra Transcatheter Pacing System
Micra is 93% smaller than traditional pacemakers,or the size of a large vitamin capsule, and incorporates a battery that lasts as long as those in traditional pacemakers. But incorporates a battery that lasts the same as pacemakers 10 times larger in size.3,4

Unlike a standard pacemaker, it is implanted into the heart through a vein in the leg and does not require a pacing lead. Due to Micra’s miniature size and minimally invasive approach, it leaves no visible sign of a medical device under the skin. This can mean fewer post-implant activity restrictions.

Micra pacemaker size comparison

How is Micra implanted?4

  • The doctor inserts a “straw-like” catheter system into a vein, typically near the upper thigh area of the leg
  • The catheter system moves the Micra into the right ventricle of the heart
  • The Micra is placed against the heart wall and secured with flexible tines
  • An external programmer is used to test and program the Micra
  • The catheter system is then removed from the body

More Information: Micra Brochure

Frequently Asked Questions

Is Micra the right pacemaker for any patient?
Micra is intended for patients who need a single chamber (also known as a ventricular pacemaker, or VVIR) pacemaker. Talk with your doctor about the benefits and risks of Micra.

Is it safe for me to have an MRI scan?
A magnetic resonance imaging (MRI) scan is a type of medical imaging that uses magnetic fields to create an internal view of the body, which doctors use for diagnostic purposes. Your Micra was designed, tested and approved to be used safely with MRI scanners. Patients can undergo an MRI scan as long as patient eligibility requirements are met.

Visit for questions about MRI scanning eligibility or about the scanning process. Heart doctors with questions should contact a Medtronic representative or Medtronic Technical Services.

Will magnets affect my Micra?
Items that contain magnets, such as magnetic therapy products, stereo speakers, and hand-held massagers can temporarily affect the operation of a pacemaker. Therefore, it is recommended keeping items containing magnets at least 15 cm away from an implanted pacemaker. We do not recommend the use of magnetic mattress pads and pillows because it is difficult to maintain a 15 cm distance when using these items.

How long will my Micra last?
A new Micra is needed when battery power falls to a low level. Battery power is affected by many factors, including the nature of the heart condition. The battery for a Micra typically lasts approximately 10 years after it is implanted, individual patient experience may vary.3

The battery power is checked at each Micra follow-up appointment. The doctor or nurse will notify the patient when they need a new pacemaker. Micra is designed to be programmed off and stay in the heart at the end of service and can be differentiated from additional Micra devices, if subsequent devices are implanted.

How often will my doctor need to check my Micra?
The first follow up appointment is typically scheduled about 1 month after your implant procedure. Additional follow-up appointments are usually scheduled every 6-12 months. However this depends on your doctor’s normal practice and your medical condition. These follow-up appointments can be performed at your clinic.

Can I use a mobile phone?
Yes, when talking on a mobile phone, keep the phone’s antenna about 15 cm away from an implanted Micra. We also recommend avoiding placing the mobile phone in a pocket near the pacemaker.

Are household appliances safe to use?
Yes. Most household appliances are safe to use as long as they are properly maintained and in good working order. This includes microwave ovens, major appliances, electric blankets, and heating pads.

Can I exercise? Can I go about my regular activities?
The patient should be able to return to their usual activities, as long as those activities do not exceed current fitness levels. Questions about specific exercises should be discussed with the physician. 

The content of this website is informative only. It does not contain nor replace any medical diagnosis. For medical diagnosis, you should always contact your healthcare professional.


  1. Nippoldt, Doug, Whiting, Jon; Micra Transcatheter Pacing System: Device Volume Characterization Comparison, November 2014, Medtronic Data on File.
  2. Williams, Eric, Whiting Jon; Micra Transcatheter Pacing System Size Comparison, November 2014, Medtronic Data on File.
  3. Nippoldt, Doug, Whiting, Jon; Micra Transcatheter Pacing System: FIH Announcement, November 2014, Medtronic Data on File.
  4. Medtronic Micra MC1VR01 Clinician Manual, November 2014.







Information on this site should not be used as a substitute for talking with your doctor. Always talk with your doctor about diagnosis and treatment information.

Last updated: 4 Jun 2015

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