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US 8,710,841 B2Granted
Sensing during magnetic resonance imaging
AssigneeCardiac Pacemakers, Inc.
InventorsScott R. Stubbs, Yingbo Li, Joseph M. Bocek
Life of this patent
Estimating the term…
Abstract
Physiologic information can be received from a subject during a portion of a magnetic resonance imaging (MRI) session using a sensing circuit of an implantable medical device (IMD). An indication of an active MRI scan can be received, and a time period to inhibit use of physiological information from the subject can be determined following the received indication of the active MRI scan.
Claims18
A system comprising:
- an implantable medical device (IMD) configured to be implanted into a subject, the IMD including:
- a sensing circuit configured to receive physiologic information from the subject during a portion of a magnetic resonance imaging (MRI) session;
- and
- a static magnetic field sensor configured to detect a static magnetic field;
- wherein the IMD is configured to:
- identify an indication of an active MRI scan;
- identify an indication of proximity to a static magnetic field using information about the detected static magnetic field from the static magnetic field sensor;
- determine a time period to inhibit use of physiologic information from the subject following the identified indication of the active MRI scan;
- and
- update at least one subject therapy parameter using the indication of proximity to the static magnetic field;
- wherein the IMD is configured to inhibit use of the received physiologic information from the subject for an initial time period following the identified indication of the active MRI scan, to identify an indication of a subsequent active MRI scan following the initial time period, and to adjust the initial time period to determine an optimal time period for a subsequent portion of the MRI session using the indication of the subsequent active MRI scan following the initial time period.
8 more elements
A system comprising:
- an implantable medical device (IMD) configured to be implanted into a subject, the IMD including:
- a sensing circuit configured to receive physiologic information from the subject during a portion of a magnetic resonance imaging (MRI) session;
- and
- wherein the IMD is configured to:
- identify an indication of an active MRI scan,
- inhibit use of physiologic information from the subject for an initial time period following the identified indication of the active MRI scan;
- and
- identify an indication of a subsequent active MRI scan following the initial time period, the MRI scans including at least one of a time-varying gradient magnetic field or an RF magnetic excitation pulse;
- wherein the IMD is configured to increase the initial time period until the IMD identifies an indication of an absence of an active MRI scan after the initial time period and then decrease the initial time period until the IMD identifies an indication of a further subsequent active MRI scan after the initial time period to determine an optimal time period.
6 more elements
A method comprising:
- receiving physiologic information from a subject during a portion of a magnetic resonance imaging (MRI) session using a sensing circuit of an implantable medical device (IMD);
- identifying an indication of proximity to a magnetic field using information from a static magnetic field sensor;
- identifying an indication of an active MRI scan using the IMD;
- determining a time period to inhibit the IMD from using the physiologic information from the subject following the identified indication of the active MRI scan;
- and
- inhibiting the IMD from using the physiologic information from the subject during the determined time period;
- wherein the determining the time period includes:
- inhibiting use of the received physiologic information from the subject for an initial time period following the identified indication of the active MRI scan;
- identifying an indication of a subsequent active MRI scan following the initial time period;
- and
- adjusting the initial time period to determine an optimal time period for a subsequent portion of the MRI session using the indication of the subsequent active MRI scan following the initial time period.
8 more elements
Dependencies are inferred from the claim text.