Distributed resistance leadwire harness assembly for physiological monitoring during magnetic resonance imaging
First Claim
1. An improved leadwire system adapted for connecting a plurality of physiological monitoring electrodes on a living body to a physiological monitoring device and for minimizing the risk of burns under the monitoring electrodes and for reducing image distortion on a scanning device, said leadwire system comprising a plurality of leadwires each including a high resistance conductor helically wound around an electrically insulating fibrous core, a layer of high temperature thermal insulating material surrounding each said conductor and providing a generally uniformly distributed high resistance along the length of each leadwire, said plurality of leadwires having means for reducing gradiant noise on the monitoring device, a jacket of high temperature thermal insulating material surrounding said plurality of leadwires, each said leadwire having one end portion adapted to be connected to a corresponding monitoring electrode, and each said leadwire having an opposite end portion adapted to be connected to an input of the monitoring device.
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Accused Products
Abstract
A leadwire harness system is used for recording an electrocardiogram (ECG) during magnetic resonance imaging (MRI). The system includes a set of leadwires each having a nichrome wire helically wound on a bundle of glass or other high strength fibers and surrounded by an insulating jacket to provide for uniformly distributing the high resistance within each leadwire so that the eddy currents generated by the rapidly changing magnetic field are greatly reduced. The set of leadwires are twisted within a surrounding tube of foam insulation. The reduction of the eddy currents dramatically reduces MRI image distortion as well as the potential for localized heating and skin burns under the ECG electrodes used with the harness system.
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Citations
22 Claims
- 1. An improved leadwire system adapted for connecting a plurality of physiological monitoring electrodes on a living body to a physiological monitoring device and for minimizing the risk of burns under the monitoring electrodes and for reducing image distortion on a scanning device, said leadwire system comprising a plurality of leadwires each including a high resistance conductor helically wound around an electrically insulating fibrous core, a layer of high temperature thermal insulating material surrounding each said conductor and providing a generally uniformly distributed high resistance along the length of each leadwire, said plurality of leadwires having means for reducing gradiant noise on the monitoring device, a jacket of high temperature thermal insulating material surrounding said plurality of leadwires, each said leadwire having one end portion adapted to be connected to a corresponding monitoring electrode, and each said leadwire having an opposite end portion adapted to be connected to an input of the monitoring device.
- 13. An improved leadwire system adapted for connecting a plurality of physiological monitoring electrodes on a living body to a physiological monitoring device and for minimizing the risk of burns under the monitoring electrodes and for reducing image distortion on a scanning device, said leadwire system comprising a plurality of leadwires each including a high resistance conductor helically wound around an electrically insulating fibrous core, a layer of high temperature thermal insulating material s surrounding each said conductor and providing a generally uniformly distributed high resistance along the length of each leadwire, said plurality of leadwires being twisted as a group for reducing gradiant noise on the monitoring device, a tubular jacket of high temperature thermal insulating material surrounding said twisted group of leadwires, a first releasable connector secured to one end portion of each said leadwire for releasably connecting said leadwire to a corresponding monitoring electrode, and a second connector secured to an opposite end portion of each said leadwire for releasably connecting said leadwire to an input of the monitoring device.
Specification