IMPLANTABLE DEVICE WITH BIAS FOR MRI
First Claim
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1. An apparatus comprising:
- an implantable medical device, comprising;
an electrical energy delivery circuit, comprising;
an integrated circuit including a diode having first and second terminals, wherein a first terminal of the diode is electrically coupled to a first reference voltage; and
energy output circuitry referenced to a second reference voltage that is set at a specified value that is configured to avoid turn-on of the diode during at least one of;
a magnetic resonance imaging (MRI) scanning, of a subject in which the implantable medical device is implanted, in an MRI scanner;
an electrocautery of the subject;
ora radiofrequency (RF) ablation of the subject.
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Abstract
An ambulatory or implantable device, such as a pacer, defibrillator, or other cardiac rhythm management device, can tolerate magnetic resonance imaging (MRI) or other noise without turning on an integrated circuit diode by selectively providing a bias voltage that can overcome an expected induced voltage resulting from the MRI or other noise.
26 Citations
20 Claims
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1. An apparatus comprising:
an implantable medical device, comprising; an electrical energy delivery circuit, comprising; an integrated circuit including a diode having first and second terminals, wherein a first terminal of the diode is electrically coupled to a first reference voltage; and energy output circuitry referenced to a second reference voltage that is set at a specified value that is configured to avoid turn-on of the diode during at least one of; a magnetic resonance imaging (MRI) scanning, of a subject in which the implantable medical device is implanted, in an MRI scanner; an electrocautery of the subject;
ora radiofrequency (RF) ablation of the subject. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus comprising:
an implantable medical device, comprising; an electrical energy delivery circuit, comprising; an integrated circuit including a diode having first and second terminals, wherein a first terminal of the diode is electrically coupled to a first reference voltage; and energy output circuitry referenced to the first reference voltage during a first mode of operation of the implantable medical device and referenced to a second reference voltage during a second mode of operation, wherein the second reference voltage is set at a specified value that avoids turn-on of the diode during a magnetic resonance imaging (MRI) scanning in an MRI scanner, and wherein the energy output circuitry comprises; an electrostimulation supply capacitor, configured to store an electrostimulation voltage to be delivered to a subject; an electrostimulation switch, configured to selectively conduct current from the electrostimulation supply capacitor to be provided to the subject, wherein the electrostimulation switch is located on the integrated circuit with the diode; a coupling capacitor, configured to be located in the electrostimulation current path during an electrostimulation pulse, and configured to be discharged during a recharge pulse; and a recharge switch, configured to selectively discharge the coupling capacitor during the recharge pulse, wherein the recharge switch is located on the integrated circuit with the diode; and a controller circuit, configured to selectively connect the energy output circuitry to the first reference voltage during the first mode of operation, and to the second reference voltage during the second mode of operation, wherein the second mode of operation is configured to provide increased noise-immunity to the implantable medical device by inhibiting turn-on of the diode in the presence of noise interference. - View Dependent Claims (14, 15)
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16. A method comprising:
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providing an implantable medical device comprising a first mode, configured for operation in an environment that does not include magnetic resonance imaging (MRI) scanning, electrocautery, or radiofrequency (RF) ablation of a subject in which the implantable medical device is implanted, and comprising a second mode configured for operation in an environment that does include at least one of resonance imaging (MRI) scanning, electrocautery, or radiofrequency (RF) ablation of a subject in which the implantable medical device is implanted; and referencing energy output circuitry of the implantable medical device to a first reference voltage during the first mode and to a second reference voltage during the second mode. - View Dependent Claims (17, 18, 19, 20)
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Specification