TANK FILTERS PLACED IN SERIES WITH THE LEAD WIRES OR CIRCUITS OF ACTIVE MEDICAL DEVICES TO ENHANCE MRI COMPATIBILITY
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Accused Products
Abstract
A TANK filter is provided for a lead wire of an active medical device (AMD). The TANK filter includes a capacitor in parallel with an inductor. The parallel capacitor and inductor are placed in series with the lead wire of the AMD, wherein values of capacitance and inductance are selected such that the TANK filter is resonant at a selected frequency. The Q of the inductor may be relatively maximized and the Q of the capacitor may be relatively minimized to reduce the overall Q of the TANK filter to attenuate current flow through the lead wire along a range of selected frequencies. In a preferred form, the TANK filter is integrated into a TIP and/or RING electrode for an active implantable medical device.
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Citations
106 Claims
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1-93. -93. (canceled)
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94. An implantable medical therapeutic or diagnostic device, comprising:
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an active medical device including electronic circuitry for therapy delivery or detection of biological signals, an electrode and an at least partially coiled lead wire for connecting the electrode to the electronic circuitry; and a capacitor disposed within a coiled portion of the lead wire, the lead wire being conductively coupled to the capacitor to form a tank filter having electrical inductance in parallel with capacitance; wherein the tank filter attenuates current flow over a range of selected frequencies. - View Dependent Claims (95, 96, 97, 98, 99, 100)
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101. A medical therapeutic or diagnostic device, comprising:
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an active medical device including electronic circuitry for therapy delivery or detection of biological signals, an electrode and an at least partially coiled lead wire for connecting the electrode to the electronic circuitry; and a chip capacitor disposed within a coiled portion of the lead wire, the capacitor having a first set of electrode plates conductively coupled to a first metallization surface, and a second set of electrode plates conductively coupled to a second metallization surface; wherein the lead wire is conductively coupled to the first and second metallization surfaces of the capacitor to form a tank filter having electrical inductance in parallel with capacitance; and wherein the tank filter has an overall circuit Q resulting in a 3 dB bandwidth on the order of MHz such that the tank filter attenuates current flow over a range of selected frequencies. - View Dependent Claims (102, 103, 104, 105)
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106. An implantable medical therapeutic or diagnostic device, comprising:
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a bipolar pacemaker including electronic circuitry for therapy delivery or detection of biological signals, a first lead wire connected to a cardiac TIP electrode and the electronic circuitry, and a second lead wire connected to a RING electrode and the electronic circuitry; and a chip capacitor comprised of biocompatible materials disposed within a coiled portion of the first or second lead wire, the capacitor having a first set of electrode plates conductively coupled to a first metallization surface, and a second set of electrode plates conductively coupled to a second metallization surface; wherein the first or second lead wire is conductively coupled to the first and second metallization surfaces of the capacitor to form a tank filter having electrical inductance in parallel with capacitance; and wherein the tank filter has an overall circuit Q resulting in a 3 dB bandwidth on the order of MHz such that the tank filter attenuates current flow over a range of selected MRI RF pulsed frequencies.
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Specification