Implantable medical device responsive to MRI induced capture threshold changes
First Claim
Patent Images
1. An implantable medical device for delivering electrical stimulation to body tissue via a lead having at least one electrode, the implantable medical device comprising:
- sensing circuitry configured to receive cardiac or neural signals through the lead based on electrical activity of the tissue;
therapy circuitry configured to deliver cardiac or neural electrical stimulation to the tissue through the lead, wherein the sensing and therapy circuitry is further configured to measure a capture threshold of the tissue;
magnetic field detection circuitry configured to detect magnetic resonance imaging (MRI) scan fields; and
control circuitry configured to change the energy delivered by the therapy circuitry from a normal energy state to an MRI mode energy state sufficient to capture the tissue including an adjustment of stimulus magnitude or duration of the cardiac or neural electrical stimulation when the magnetic detection circuitry detects a MRI scan field, and, after the magnetic field detection circuitry no longer detects the MRI scan field, to control the sensing and therapy circuitry to measure the capture threshold and then change the energy delivered by the therapy circuitry based on the capture threshold that was measured after the MRI scan field is no longer detected.
0 Assignments
0 Petitions
Accused Products
Abstract
Energy delivered from an implantable medical device to stimulate tissue within a patient'"'"'s body is controlled. An electrical signal used to stimulate the tissue is changed from a first energy state to a second energy state during a magnetic resonance imaging (MRI) scan. The energy delivered is maintained at the second energy state after the MRI scan. A capture threshold of the tissue is then measured, and the energy delivered to the tissue is adjusted based on the measured capture threshold of the tissue.
346 Citations
20 Claims
-
1. An implantable medical device for delivering electrical stimulation to body tissue via a lead having at least one electrode, the implantable medical device comprising:
-
sensing circuitry configured to receive cardiac or neural signals through the lead based on electrical activity of the tissue; therapy circuitry configured to deliver cardiac or neural electrical stimulation to the tissue through the lead, wherein the sensing and therapy circuitry is further configured to measure a capture threshold of the tissue; magnetic field detection circuitry configured to detect magnetic resonance imaging (MRI) scan fields; and control circuitry configured to change the energy delivered by the therapy circuitry from a normal energy state to an MRI mode energy state sufficient to capture the tissue including an adjustment of stimulus magnitude or duration of the cardiac or neural electrical stimulation when the magnetic detection circuitry detects a MRI scan field, and, after the magnetic field detection circuitry no longer detects the MRI scan field, to control the sensing and therapy circuitry to measure the capture threshold and then change the energy delivered by the therapy circuitry based on the capture threshold that was measured after the MRI scan field is no longer detected. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. An implantable medical device for delivering electrical stimulation to body tissue via a lead having at least one electrode, the implantable medical device comprising:
-
sensing circuitry operable to receive cardiac or neural signals through the lead based on electrical activity of the tissue; therapy circuitry operable to deliver cardiac or neural electrical stimulation to the tissue through the lead, wherein the sensing and therapy circuitry is further operable to measure a capture threshold of the tissue; magnetic field detection circuitry operable to detect magnetic resonance imaging (MRI) scan fields; and control circuitry operable to set energy delivered by the therapy circuitry to stimulate the tissue from a normal energy state to an MRI mode energy state sufficient to capture the tissue including an adjustment of stimulus magnitude or duration of the cardiac or neural electrical stimulation when the magnetic detection circuitry detects the MRI scan fields, and, after the magnetic field detection circuitry no longer detects the MRI scan fields, to adjust the energy delivered based on the measured capture threshold of the tissue. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
-
-
20. An implantable medical device for delivering electrical stimulation to body tissue via a lead having at least one electrode, the implantable medical device comprising a control circuitry configured to:
-
in response to a presence of an MRI scan field, control the implantable medical device to deliver cardiac or neural electrical stimulation with an MRI mode energy state sufficient to capture the tissue; and in response to an absence of the MRI scan field, change the MRI mode energy state to a post-MRI mode energy state based on a capture threshold when the MRI scan field is absent, and control the implantable medical device to deliver cardiac or neural electrical stimulation with the post-MRI mode energy state; wherein the change from the MRI mode energy state to the post-MRI mode energy state includes an adjustment of stimulus magnitude or duration of the of the cardiac or neural electrical stimulation.
-
Specification