MRI compatible implantable medical devices and methods
First Claim
1. An implantable medical device comprising:
- a housing comprising an electrically conductive material;
pulse generation circuitry disposed within the housing for generating electrical voltage pulses;
a protection diode located in series with and between the housing and the pulse generation circuitry;
a resistor located in series with the protection diode between the housing and the pulse generation circuitry; and
a first switch located in series with the protection diode and the resistor, the switch configured to selectively isolate the housing from the pulse generation circuitry.
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Accused Products
Abstract
An implantable medical device configured to be compatible with the environment inside an MRI machine. The implantable medical device includes a housing constructed of an electrically conductive material and pulse generation circuitry within the housing for generating electrical voltage pulses. The implantable medical device further includes a first conductor that is configured to transmit the electrical voltage pulses from the pulse generation circuitry to a patient'"'"'s cardiac tissue and a second conductor that is configured to provide an electrically conductive path from the patient'"'"'s cardiac tissue back to the pulse generation circuitry. The implantable medical device further includes a selectively interruptible electrically conductive path connecting the pulse generation circuitry with the housing.
54 Citations
20 Claims
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1. An implantable medical device comprising:
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a housing comprising an electrically conductive material; pulse generation circuitry disposed within the housing for generating electrical voltage pulses; a protection diode located in series with and between the housing and the pulse generation circuitry; a resistor located in series with the protection diode between the housing and the pulse generation circuitry; and a first switch located in series with the protection diode and the resistor, the switch configured to selectively isolate the housing from the pulse generation circuitry. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for operating an implantable medical device (IMD), the method comprising:
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providing, for the IMD, a housing comprising an electrically conductive material; providing, for the IMD, pulse generation circuitry disposed within the housing for generating electrical voltage pulses; providing, for the IMD, a protection diode located in series with and between the housing and the pulse generation circuitry; providing, for the IMD, a resistor located in series with the protection diode between the housing the pulse generation circuitry; providing, for the IMD, a first switch located in series with the protection diode and the resistor, the switch configured to selectively isolate the housing from the pulse generation circuitry; and limiting, for the IMD, a magnetic-resonance-imaging-induced current through the protection diode using the resistor. - View Dependent Claims (16, 17, 18, 19)
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20. An implantable medical device comprising:
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a housing comprising an electrically conductive material; pulse generation circuitry disposed within the housing for generating electrical voltage pulses; a protection diode located in series with and between the housing and the pulse generation circuitry; a resistor located in series with the protection diode between the housing the pulse generation circuitry, the resistor located between the diode and the pulse generation circuitry; and a first switch located in series with the protection diode and the resistor, the switch configured to selectively isolate the housing from the pulse generation circuitry; wherein the pulse generation circuitry is otherwise electrically isolated from the housing.
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Specification