Patent ID: 9561378
Date: 2017-02-07
CPC Classifications: A61N

Claim:
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.