MRI-compatible implantable device
First Claim
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1. An MRI-compatible cardiac assist device, comprising:
- a first implantable pulse generator for generating pacing pulses responsive to sensing signals;
a sensing electrode coupled to said first implantable pulse generator for sensing parameters of a heart and providing the sensing signals;
pacing electrodes coupled to said first implantable pulse generator for pacing the heart with the pacing pulses;
a detector for detecting radio frequency signals generated by an MRI scanner; and
a circuit disposed in the coupling between said first implantable pulse generator and said sensing electrode, responsive to said detector, for opening the coupling between said first implantable pulse generator and said sensing electrode to inhibit current induced by the MRI scanner, when said detector detects radio frequency signals generated by the MRI scanner;
a second implantable pulse generator connected to the circuit, configured to pace the heart with pacing pulses via at least one lead coupled to the second implantable pulse generator when the coupling between said first implantable pulse generator and said sensing electrode is opened by said circuit.
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Abstract
A medical device containing a device for connecting the medical device to a substrate, for furnishing electrical impulses from the medical device to the substrate, for ceasing the furnishing of electrical impulses to the substrate, for receiving pulsed radio frequency fields, for transmitting and receiving optical signals, and for protecting the substrate and the medical device from currents induced by the pulsed radio frequency fields. The medical device contains a control circuit comprised of a parallel resonant frequency circuit.
327 Citations
5 Claims
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1. An MRI-compatible cardiac assist device, comprising:
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a first implantable pulse generator for generating pacing pulses responsive to sensing signals; a sensing electrode coupled to said first implantable pulse generator for sensing parameters of a heart and providing the sensing signals; pacing electrodes coupled to said first implantable pulse generator for pacing the heart with the pacing pulses; a detector for detecting radio frequency signals generated by an MRI scanner; and a circuit disposed in the coupling between said first implantable pulse generator and said sensing electrode, responsive to said detector, for opening the coupling between said first implantable pulse generator and said sensing electrode to inhibit current induced by the MRI scanner, when said detector detects radio frequency signals generated by the MRI scanner; a second implantable pulse generator connected to the circuit, configured to pace the heart with pacing pulses via at least one lead coupled to the second implantable pulse generator when the coupling between said first implantable pulse generator and said sensing electrode is opened by said circuit. - View Dependent Claims (2)
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3. A method for continuing to provide pacing therapy to a heart of a patient in the presence of an MRI environment, comprising the steps of:
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sensing signals received from a sensing electrode coupled to a first implantable pulse generator; pacing the heart via pacing electrodes responsive to the sensing; sensing the presence of the MRI environment; opening the coupling between the sensing electrode and the first implantable pulse generator to inhibit current induced by the MRI environment, when said sensing step senses the presence of the MRI environment; and pacing the heart via a lead coupled to a second implantable pulse generator when the coupling between the sensing electrode and the first implantable pulse generator is opened in said opening step. - View Dependent Claims (4)
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5. An MRI-compatible cardiac assist device, comprising:
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a first implantable pulse generator for generating pacing pulses responsive to sensing signals; a sensing electrode coupled to said first implantable pulse generator for sensing a heart and providing the sensing signals; pacing electrodes coupled to said first implantable pulse generator for pacing the heart via the pacing pulses; a second implantable pulse generator for generating secondary pacing pulses; a second pacing electrode coupled to said second pulse generator for pacing the heart via the secondary pacing pulses; a detector for detecting radio frequency signals generated by an MRI scanner; and circuits disposed in the coupling between said first implantable pulse generator and said sensing electrode and in the coupling between said first implantable pulse generator and said pacing electrodes, responsive to said detector, for opening the coupling between said first implantable pulse generator and said sensing electrode to inhibit current induced by the MRI scanner and for opening the coupling between said first implantable pulse generator and said pacing electrodes, when said detector detects radio frequency signals generated by the MRI scanner; wherein said second implanted pulse generator connected to the circuits, is configured to pace the heart via the secondary pacing pulses through said second pacing electrode, when said detector detects radio frequency signals generated by the MRI scanner and the coupling between said first implantable pulse generator and said sensing electrode is opened.
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Specification