Unipolar pacing in the presence of electromagnetic interference
First Claim
1. A method comprising:
- generating single stimulation pulses while operating an implantable medical device (IMD) in a first operating mode;
detecting a condition indicative of the presence of electromagnetic interference (EMI);
switching the IMD from the first operating mode to a second operating mode in response to detecting the condition indicative of the presence of EMI, wherein the second operating mode comprises an asynchronous pacing mode in which pacing therapy is delivered without regard to sensed electrical signals; and
generating at least one group of two or more stimulation pulses in close proximity to one another while operating the IMD in the second operating mode, wherein the two or more stimulation pulses of the group are within 110 milliseconds of one another.
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Abstract
An implantable medical system may include an implantable medical lead including at least one electrode and an implantable medical device. The implantable medical device comprises an electromagnetic interference (EMI) detection module that monitors for one or more particular characteristics of EMI. A control module is configured to control a therapy module to generate single stimulation pulses while operating the IMD in a first operating mode. In response to detecting the condition indicative of the presence of EMI, the control module switches the IMD from the first operating mode to a second operating mode and generates at least one group of two or more stimulation pulses in close proximity to one another in place of a single stimulation pulse while operating the IMD in the second operating mode.
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Citations
26 Claims
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1. A method comprising:
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generating single stimulation pulses while operating an implantable medical device (IMD) in a first operating mode; detecting a condition indicative of the presence of electromagnetic interference (EMI); switching the IMD from the first operating mode to a second operating mode in response to detecting the condition indicative of the presence of EMI, wherein the second operating mode comprises an asynchronous pacing mode in which pacing therapy is delivered without regard to sensed electrical signals; and generating at least one group of two or more stimulation pulses in close proximity to one another while operating the IMD in the second operating mode, wherein the two or more stimulation pulses of the group are within 110 milliseconds of one another. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An implantable medical system comprising:
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an implantable medical lead including at least one electrode; an implantable medical device comprising; an electromagnetic interference (EMI) detection module that monitors for one or more particular characteristics of EMI; a therapy module that delivers pacing therapy via the implantable medical lead; a control module that controls the therapy module to generate single stimulation pulses while operating the IMD in a first operating mode, detects a condition indicative of EMI based on the one or more monitored characteristics, switches the IMD from the first operating mode to a second operating mode in response to detecting the condition indicative of the presence of EMI, and controls the therapy module to generate at least one group of two or more stimulation pulses within 110 milliseconds of one another while operating the IMD in the second operating mode; and a gradient field detection module that detects gradient magnetic fields while operating in the second operating mode, wherein the control module determines whether a detected gradient magnetic field coincides with a timing of a desired stimulation pulse, controls therapy module to generate a single stimulation pulse when the detected gradient magnetic field does not coincide with the timing of the desired stimulation pulse, and controls therapy module to generate the at least one group of two or more stimulation pulses when the detected gradient magnetic field does coincide with the timing of the desired stimulation pulse. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. A computer-readable medium comprising instructions that, when executed, cause an implantable medical device (IMD) to:
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generate single stimulation pulses while operating the IMD in a first operating mode; detect a condition indicative of the presence of electromagnetic interference (EMI); switch the IMD from the first operating mode to a second operating mode in response to detecting the condition indicative of the presence of EMI; and generate a group of two or more stimulation pulses within 110 milliseconds of one another each time a pacing pulse is desired while operating the IMD in the second operating mode. - View Dependent Claims (23, 24, 25, 26)
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Specification