Implantable stimulation device with isolating system for minimizing magnetic induction
First Claim
1. An implantable cardiac device comprising:
- internal circuitry;
a housing that encases the internal circuitry;
a conductor connected to the internal circuitry;
an isolation system comprising;
a sensor unit that detects a presence of a magnetic field;
at least one non-filtered feedthrough that prevents a current induction loop from forming between the conductor and the housing;
at least one filtered feedthrough disposed within the housing and that protects the internal circuitry; and
a switch bank disposed inside the housing, between the non-filtered feedthrough and the filtered feedthrough, and connected to the sensor unit, to selectively disconnect an electrical conduction path from the conductor to the internal circuitry, upon sensing the presence of a predetermined magnetic field by the sensor unit.
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Accused Products
Abstract
An implantable cardiac stimulation device is equipped with an isolation system capable of attenuating or eliminating induction currents flowing through the stimulation device by eliminating induction loops. The isolation system comprises a magnetic insulator configured to shield selected components of the stimulation device from external magnetic fields or radio-frequency (RF) signals. The magnetic insulator comprises a plurality of sensors that are configured to detect the intensity of the external magnetic fields and/or RF signals, and a switch bank that electrically isolates certain components of the stimulation device to eliminate the induction loops. The isolation system further comprises an attenuation system comprised of at least one magnetoresistor disposed along potential induction loops to attenuate induction currents when subjected to undesirable external magnetic fields and/or RF signals.
193 Citations
36 Claims
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1. An implantable cardiac device comprising:
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internal circuitry;
a housing that encases the internal circuitry;
a conductor connected to the internal circuitry;
an isolation system comprising;
a sensor unit that detects a presence of a magnetic field;
at least one non-filtered feedthrough that prevents a current induction loop from forming between the conductor and the housing;
at least one filtered feedthrough disposed within the housing and that protects the internal circuitry; and
a switch bank disposed inside the housing, between the non-filtered feedthrough and the filtered feedthrough, and connected to the sensor unit, to selectively disconnect an electrical conduction path from the conductor to the internal circuitry, upon sensing the presence of a predetermined magnetic field by the sensor unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. An implantable cardiac device comprising:
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internal circuitry;
a housing that encases the internal circuitry;
a conductor connected to the internal circuitry;
an isolation system comprising;
a sensor unit that detects a presence of a radio frequency signal;
at least one non-filtered feedthrough that prevents a current induction loop from forming between the conductor and the housing;
at least one filtered feedthrough disposed within the housing, that protects the internal circuitry; and
a switch bank disposed inside the housing, between the non-filtered feedthrough and the filtered feedthrough, and connected to the sensor unit to selectively disconnect an electrical conduction path from the conductor to the internal circuitry, upon sensing the presence of the radio frequency signal by the sensor unit. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30)
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31. An implantable cardiac device comprising:
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a sealed compartment that contains an internal circuitry;
means for defining an electrical conduction path to the internal circuitry; and
means for attenuating a formation of a current induction loop, comprising;
sensing means for detecting the presence of a radio frequency signal;
means for preventing a current induction loop from forming between the means for defining and the sealed compartment;
means for protecting the internal circuitry; and
switching means for selectively disconnecting the electrical conduction path from the means for defining to the internal circuitry, upon sensing the presence of the radio frequency signal by the sensing means. - View Dependent Claims (32, 33, 34, 35)
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36. In an implantable cardiac device comprising a housing, internal circuitry within the housing, and at least one conductor connected to the circuitry, a method comprising:
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preventing an induction loop from forming between the conductor and housing via a non-filtered feedthrough;
protecting the internal circuitry via a filtered feedthrough;
sensing a presence of a predetermined external field; and
disconnecting a conduction path from the conductor to the internal circuitry upon sensing the predetermined external field.
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Specification