Systems and methods for improving RF compatibility of electrical stimulation leads
First Claim
1. An implantable lead assembly for an electrical stimulation system, the lead assembly comprising:
- a first lead configured and arranged for insertion into a patient, the first lead comprisinga lead body having a distal end portion, a proximal end portion, and a longitudinal length,a plurality of electrodes disposed along the distal end portion of the lead body,a plurality of terminals disposed along the proximal end portion of the lead body, anda plurality of conductors electrically coupling the plurality of electrodes to the plurality of terminals; and
a current-limiting arrangement coupleable with the first lead, the current-limiting arrangement configured and arranged for limiting the amount of RF-induced current propagating along the lead body during an MRI procedure, the current-liming arrangement comprisinga safety device configured and arranged to couple to the lead body when the lead body is implanted in the patient, the safety device having a length and an outer surface, the safety device defining a first port extending along the length of the safety device, the first port configured and arranged for receiving the proximal end portion of the lead body and for covering each of the plurality of terminals to prevent the plurality of terminals from contacting patient tissue, wherein the safety device provides an impedance of at least 50 ohms at one or more MRI RF frequencies, anda monitoring device coupleable to the safety device and comprising an alarm configured and arranged for activating when the monitoring device detects a potentially unsafe condition being experienced by the safety device.
1 Assignment
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Accused Products
Abstract
An implantable lead assembly for an electrical stimulation system includes a first lead configured for insertion into a patient. A current-limiting arrangement is coupleable with the first lead. The current-limiting arrangement is configured for limiting the amount of RF-induced current propagating along a body of the first lead during an MRI procedure. The current-liming arrangement includes a safety device configured to couple to the lead body when the lead body is implanted in the patient. The safety device defines a first port extending along a length of the safety device. The first port is configured for receiving a proximal end portion of the lead body and covering each of multiple terminals disposed along the lead body to prevent the terminals from contacting patient tissue. The safety device provides an impedance of at least 50 ohms at one or more MRI RF frequencies.
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Citations
20 Claims
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1. An implantable lead assembly for an electrical stimulation system, the lead assembly comprising:
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a first lead configured and arranged for insertion into a patient, the first lead comprising a lead body having a distal end portion, a proximal end portion, and a longitudinal length, a plurality of electrodes disposed along the distal end portion of the lead body, a plurality of terminals disposed along the proximal end portion of the lead body, and a plurality of conductors electrically coupling the plurality of electrodes to the plurality of terminals; and a current-limiting arrangement coupleable with the first lead, the current-limiting arrangement configured and arranged for limiting the amount of RF-induced current propagating along the lead body during an MRI procedure, the current-liming arrangement comprising a safety device configured and arranged to couple to the lead body when the lead body is implanted in the patient, the safety device having a length and an outer surface, the safety device defining a first port extending along the length of the safety device, the first port configured and arranged for receiving the proximal end portion of the lead body and for covering each of the plurality of terminals to prevent the plurality of terminals from contacting patient tissue, wherein the safety device provides an impedance of at least 50 ohms at one or more MRI RF frequencies, and a monitoring device coupleable to the safety device and comprising an alarm configured and arranged for activating when the monitoring device detects a potentially unsafe condition being experienced by the safety device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification