Medical implantable system for reducing magnetic resonance effects
First Claim
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1. An implantable medical system, comprising;
- an operational control subsystem for controlling a therapy delivery component of the implantable medical system, wherein the therapy delivery component includes at least one therapy delivery lead;
a magnetic sensor to measure a magnetic field surrounding the environment in which the system is located and provide a magnetic field strength value indicative of the magnitude of the magnetic field;
at least one circuit coupled to the operational control subsystem and the magnetic sensor to receive the magnetic field strength value and compare the magnetic field strength value to a threshold value and output a control signal to the operational control system if the magnetic field strength value exceeds the threshold, wherein the threshold value is a predetermined value above which the environmental magnetic field is capable of adversely interfering with normal operation of the therapy delivery lead; and
an adjustment component communicatively coupled with the operational control system, wherein the adjustment component controls a portion of the therapy delivery component if the operational control system receives the control signal.
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Abstract
Apparatus and methods are disclosed for reducing the potentially harmful effects of electromagnetic waves on an implantable medical device. In one embodiment of the present invention, an implantable medical system comprising a dual threshold magnetic sensor capable of detecting an elevated magnetic field is disclosed. The sensor can comprise a solid-state sensor capable of detecting a static magnetic field in excess of about 1500 Gauss. The magnetic sensor can be operatively coupled to electronics that are capable of altering the operation of the system upon detection of an elevated magnetic field by the magnetic sensor.
192 Citations
21 Claims
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1. An implantable medical system, comprising;
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an operational control subsystem for controlling a therapy delivery component of the implantable medical system, wherein the therapy delivery component includes at least one therapy delivery lead; a magnetic sensor to measure a magnetic field surrounding the environment in which the system is located and provide a magnetic field strength value indicative of the magnitude of the magnetic field; at least one circuit coupled to the operational control subsystem and the magnetic sensor to receive the magnetic field strength value and compare the magnetic field strength value to a threshold value and output a control signal to the operational control system if the magnetic field strength value exceeds the threshold, wherein the threshold value is a predetermined value above which the environmental magnetic field is capable of adversely interfering with normal operation of the therapy delivery lead; and an adjustment component communicatively coupled with the operational control system, wherein the adjustment component controls a portion of the therapy delivery component if the operational control system receives the control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An implantable medical system, comprising:
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means for operating a therapy delivery lead of the implantable medical system a magnetic sensor for measuring a magnetic field strength; comparison means for receiving a measured magnetic field strength value from the magnetic sensor and comparing the measured magnetic field strength value to a threshold value and generating a control signal to the means for operating if the measured magnetic field strength value exceeds the threshold value, wherein the threshold value is a predetermined value above which the magnetic field is capable of adversely interfering with normal operation of the therapy delivery lead; and means for modifying the operation of the therapy delivery lead if the comparison means generates the control signal. - View Dependent Claims (13, 14)
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15. A method of operating an implantable medical system, comprising:
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operating the implantable medical system in a normal mode of operation; measuring a magnetic field strength; comparing the measured magnetic field strength to a threshold value, wherein the threshold value is a predetermined value indicative of a magnetic field strength above which the magnetic field is capable of interfering with a therapy delivery lead of the implantable medical system; and altering an operation of a therapy delivery lead of the medical system if the measured field strength value exceeds the threshold. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification