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US 8,818,489 B2Granted
Medical device sensing and detection during MRI
AssigneeMedtronic, Inc.
InventorVolkert A Zeijlemaker
Life of this patent
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Abstract
A medical device includes a sensor for sensing for an MRI gradient magnetic field and a microprocessor configured to operate in a signal processing mode in which electrical signals induced by the gradient magnetic field are not counted as cardiac events.
Claims16
An implantable medical device comprising:
- a first sensor configured to detect the presence of a static magnetic field;
- a second sensor, separate from the first sensor, configured to detect the presence of gradient magnetic fields, wherein the second sensor is activated only after the first sensor detects the presence of the static magnetic field;
- and
- a microprocessor configured to switch operation of the implantable medical device from a first signal processing mode to a second signal processing mode in response to detecting the presence of gradient magnetic fields.
1 more element
A method comprising:
- detecting the presence of a static magnetic field with a first sensor of an implantable medical device;
- activating a second sensor of the implantable medical device, separate from the first sensor, only after detecting the presence of the static magnetic field;
- detecting the presence of gradient magnetic fields with the second sensor;
- and
- configuring operation of the implantable medical device from a first signal processing mode to a second signal processing mode in response to detecting the presence of gradient magnetic fields.
2 more elements
Dependencies are inferred from the claim text.