On 12/19/2025, the firm sent via Adobe DocuSign an "Urgent: Medical Device Correction" letter to customers informing them that It has been discovered that in the superconducting magnet used in the applicable system, if there is slow leakage, over a long period of time, of refrigerant gas from the superconducting magnet, air ingress into the helium vessel via the leak point may
result in ice forming.
If this is left unchecked, the worst-case scenario is that the helium gas will not be able
to escape through the designed exhaust path, and the helium tank could eventually
rupture, releasing helium gas into the MR scan room.
For safety management of the superconducting magnet, the status of the magnet is
checked during maintenance inspections and continuously monitored by a remote
monitoring system. However, in response to the above report from the manufacturer
of the superconducting magnet, an inspection to check for slow gas leaks in the
superconducting magnet used in systems installed at our customer sites will be
provided as a repair service. Note that there have been no reports of health hazards
related to this incident.
Customer are instructed to:
The system can continue to be used. However, please ensure there are adequate
evacuation routes from the scan/imaging room and the control room. Additionally, do
not press the quench button in cases other than emergencies.
A representative of Canon Medical Systems USA will contact you to schedule an
inspection. If you have any questions regarding this matter, please contact your service
representative.
Share the contents of letter with all users and reviewing radiologist as well as
clinical engineering or biomedical group at their facility. In addition, posted the Recall Letter on or near potentially affected systems.
For any questions regarding this letter please contact Orlando Tadeo, Director Regulatory Affairs, at 800-421-1968 or
[email protected] or your Canon service representative at 800-521-1968.