MRI compatible implantable medical devices and methods

摘要

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.

主权项

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 disposed in series with and between the housing and the pulse generation circuitry; a first switch configured to selectively change between a bipolar mode and a unipolar mode; and a second switch disposed in series with the protection diode, the second switch configured to interrupt a current path through the protection diode to selectively isolate the housing from the pulse generation circuitry during magnetic resonance imaging.