MRI-compatible implantable medical lead
AssigneeSt. Jude Medical, Inc.
InventorMichael Wang
Life of this patent
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Abstract
An MRI-compatible implantable medical lead includes two electrodes coupled to a distal end of the lead, two matching electrode terminals coupled to a proximal end and a lead body in the form of an outer insulating tubing running from the distal end to the proximal end. A coaxial conductor assembly is arranged in a bore of the outer insulating tubing and comprises an inner conductor, an outer conductor and an inner insulating tubing arranged between the inner and outer conductors. A capacitor is arranged between the inner conductor and the outer conductor at a distance from the distal end defined based on the magnetic field strength of the MRI system with which the lead is compatible.
Claims14
An implantable medical lead compatible with a Magnetic Resonance Imaging (MRI) system comprising:
- a first electrode and a second electrode arranged in connection with a distal end of said implantable medical lead;
- a connector having a first electrode terminal and a second electrode terminal, the connector being configured to be mechanically and electrically coupled to an implantable medical device;
- a coaxial conductor assembly having an inner conductor electrically coupled to said first electrode and said first electrode terminal, an outer conductor electrically coupled to said second electrode and said second electrode terminal and an inner insulating tubing arranged between said inner conductor and said outer conductor for electrically isolating said inner conductor from said outer conductor,
- a capacitor arranged between said inner conductor and said outer conductor at a distance D from said distal end defined based on a magnetic field strength of said MRI system, wherein said distance D is defined based on said magnetic field strength so that an impedance of said capacitor is mirrored to said distal end to provide an impedance between said first electrode and said second electrode that drains a current, induced by said MRI system, between said first electrode and said second electrode.
An implantable medical lead compatible with a Magnetic Resonance Imaging (MRI) system comprising:
- a first electrode and a second electrode arranged in connection with a distal end of said implantable medical lead;
- a coaxial conductor assembly having an inner conductor electrically coupled to said first electrode, an outer conductor electrically coupled to said second electrode and an inner insulating tubing arranged between said inner conductor and said outer conductor for electrically isolating said inner conductor from said outer conductor,
- a capacitor arranged between said inner conductor and said outer conductor at a distance D from said distal end defined based on a magnetic field strength of said MRI system so that an impedance of said capacitor is mirrored to said distal end to provide an impedance between said first electrode and said second electrode that drains a current, induced by said MRI system, between said first electrode and said second electrode;
- trending the sinus rate over time using sinus rate values satisfying the measurement conditions;
- and
- determining a preferred pacing therapy setting providing a lowest sinus rate based on a trend analysis of the sinus rate.
Dependencies are inferred from the claim text.