MRI Safety Information

Important MRI Safety Information 

Magnetic resonance imaging (MRI) may be safely performed under certain conditions on a patient with a Freedom Stimulator; however, the Transmitter Assembly unit (i.e., the external transmitter and antenna components of this neuromodulation system) MUST NOT be present in the MR system room at ANY TIME. Failure to adhere to the specific requirements described in this manual can result in tissue damage, severe injury, or death.

 

Preparation for an MRI 

The following steps must be performed prior to an MRI on a patient with an implanted Freedom® Stimulator:

  • Verify with the MRI operator that all proposed MRI conditions comply with the requirements specified in this manual the Instructions for Use. If any MRI parameter is not met and cannot be modified, do not perform the MRI procedure.
  • Remove the Transmitter Assembly (the external transmitter and antenna components of the Freedom System) from the patient before allowing the patient to enter the room where the MRI procedure will take place.
  • Do not conduct an MRI procedure if the patient has any other implant or health condition that prohibits or contraindicates an MRI examination. If the patient has another implant, especially an electronically activated or “active” device, the safety of performing an MRI with the addition of Freedom Receiver Stimulator is unknown.
  • Instruct the patient to immediately inform the MRI system operator (i.e., the MRI technologist) if any discomfort, stimulation, shocking, or heating occurs during the examination.
  • The patient must be conscious during the MRI in order to be able to inform the MRI operator of any problems.
  • Verify with the MRI operator that all proposed MRI conditions comply with the requirements specified in this manual. If any MRI parameter is not met and cannot be modified, do not perform the MRI procedure.

MRI Conditions


Freedom-8A (FR8A) Stimulator Receiver for Spinal Cord Stimulator (SCS)

  • Non-clinical testing has demonstrated the Freedom-8A SCS Stimulator Receiver is MR Conditional. The Freedom-8A Stimulator Receiver can be scanned safely under the following conditions.
  • Static magnetic field of 1.5-Tesla or 3-Tesla.
  • Maximum spatial gradient field of 10 T/m (1,000 Gauss/cm).
  • Whole Body Scans at 1.5Tesla/64MHz – Maximum MR system reported, whole body averaged specific absorption rate (SAR) of 2.0 W/kg (Normal Operating Mode).
  • Head and Extremity Scans at 3Tesla/128MHz – Maximum MR system reported, whole body averaged specific absorption rate (SAR) of 2.0 W/kg (Normal Operating Mode).
  • Torso Scans at 3Tesla/128MHz – Maximum MR system reported, whole body averaged specific absorption rate (SAR) of 0.3 W/kg. This SAR limitation is more restrictive than the Normal Operating Mode.
  • No other components of Freedom SCS System (e.g. Transmitter Assembly, wireless charging pad, needle, stylets, guidewire) may be taken into the MR system room.
  • No restrictions on position of the Stimulator with respect to MR system bore or body part undergoing MR imaging.
  • No restrictions on use of transmit RF coils.

    NOTE: Enter the patient’s weight into the MR system console to ensure that the whole body averaged specific absorption rate (SAR) is estimated correctly.

Freedom-4 (FRE4) Stimulator for Spinal Cord Stimulation (SCS)

  • Non-clinical testing has demonstrated the Freedom-4 SCS Stimulator is MR Conditional. The Freedom-4 Stimulator can be scanned safely under the following conditions.
  • Static magnetic field of 1.5-Tesla or 3-Tesla.
  • Maximum spatial gradient field of 30 T/m (3,000 Gauss/cm).
  • No restrictions on position of the Freedom-4 Stimulator with respect to MR system bore or body part undergoing MR imaging.
  • No other components of Freedom SCS System (e.g. Transmitter Assembly, wireless charging pad, needle, stylets, guidewire) may be taken into the MR system room.
  • No restrictions on use of transmit RF coils.

    NOTE: Enter the patient’s weight into the MR system console to ensure that the whole body averaged specific absorption rate (SAR) is estimated correctly.

 

Freedom-4A (STQ4, FR4A) Stimulator for Peripheral Nerve Stimulation (PNS)

Non-clinical testing demonstrated that the Freedom-4A Stimulator/Spare Lead with Receiver/RF Stylet is MR Conditional. A patient with this device can be safety scanned in an MR system meeting the following conditions.

  • Static magnetic field of 1.5-Tesla.
  • Maximum spatial gradient magnetic field of 1000 Gauss/cm (10 T/m).
  • Stimulators/Leads Implanted in Upper Arm (e.g. located between elbow and shoulder)
  • Scanning the upper arm region (i.e. radial and ulnar nerves near the implant) at 1.5Tesla/64MHz – Maximum MR system reported, whole body averaged specific absorption rate (SAR) of 1.0 W/kg. This SAR is more restrictive than Normal Operating Mode.
  • Scanning any other region (e.g. lower arm, shoulder, head, torso, leg) at 1.5 Tesla/64MHz – Maximum MR system reported, whole body averaged specific absorption rate (SAR) of 2.0 W/kg (Normal Operating Mode).
  • Stimulators/Leads Implanted in Lower Arm, Low Back, Pelvis, Leg:
  • Whole Body Scans (i.e. near or far from implant) at 1.5Tesla/64MHz – Maximum MR system reported, whole body averaged specific absorption rate (SAR) of 2.0W/kg (Normal Operating Mode).
  • No other components of the Freedom PNS System (e.g. Freedom Wearable Assembly Gear, battery charger, needles, stylets, introducer assembly, trial lead) may be taken into the MR system room.

    NOTE: Enter the patient’s weight into the MR system console to ensure that the whole body averaged specific absorption rate (SAR) is estimated correctly.

 

Freedom-4A (FR4A) Stimulator for SCS
The Freedom-4A SCS System is MR unsafe. Since the Freedom-4A SCS System is MR unsafe, the strong magnetic field of the MR system could attract or otherwise damage the System, and in the process cause serious harm to the patient or other people or damage to the MR system.

Freedom-8A (FR8A) Stimulator for PNS
The Freedom-8A PNS System is MR unsafe. Since the Freedom-8A PNS System is MR unsafe, the strong magnetic field of the MR system could attract or otherwise damage the System, and in the process cause serious harm to the patient or other people or damage to the MR system.

During an MRI examination
The patient should be conscious during the MRI procedure. Monitor the patient both visually and audibly. Check the patient between each MR imaging sequence. Discontinue the MRI examination immediately if the patient is unable to respond to questions or reports any problem.

Freedom Trial Stimulators for SCS and PNS

The Freedom Trial devices are MR Unsafe due to the lack of fixation of the device during the trial period.

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Content contained or made available through this website is for informational purposes only, Curonix has no vested interest in any specific physician(s), nor do we provide any recommendation, assurance, or guarantee with respect to their service. This information does not constitute medical, legal, or any other type of professional advice. Curonix LLC is a manufacturer of medical devices and does not practice medicine. Consult a qualified healthcare professional for advice regarding the diagnosis and treatment of any medical condition. Individual results may vary [depending on a variety of patient-specific attributes and related factors]. For product safety information, including information on risks, warnings, and possible adverse side effects please see the Instructions for Use.

The Freedom® PNS System is indicated for treatment of chronic, intractable pain of the peripheral nerve origin. The Freedom PNS System is not indicated for use in the craniofacial region.
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