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Apparatus and process for reducing the susceptability of active implantable medical devices to medical procedures such as magnetic resonance imaging

A medical device, a technology for the device, applied in the field of devices and processes for reducing the susceptibility of active implantable medical devices to medical procedures such as magnetic resonance imaging, capable of solving problems such as damage to reed switches

Inactive Publication Date: 2006-04-26
GREATBATCH SIERRA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] (2) Broken reed switch
In situations where the patient's life is truly in danger, the physician may make the decision to perform an MRI despite all the previously described attendant dangers of the pacemaker system

Method used

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  • Apparatus and process for reducing the susceptability of active implantable medical devices to medical procedures such as magnetic resonance imaging
  • Apparatus and process for reducing the susceptability of active implantable medical devices to medical procedures such as magnetic resonance imaging
  • Apparatus and process for reducing the susceptability of active implantable medical devices to medical procedures such as magnetic resonance imaging

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Embodiment Construction

[0186] As shown for purposes of illustration in the accompanying drawings, the present invention relates to a lossy ferrite inductor 200 (hereinafter referred to as a lossy ferrite inductor) that is both resistive and inductive, mounted on Adjacent or adjacent to the hermetic terminal 202 of an active implantable medical device (AIMD) 204 . The lossy ferrite inductor 200 may be combined with a feed-through filter capacitor assembly 206, which includes a capacitor 208 having first and second sets of conductive electrode plates 210, 212 embedded in Insulator or dielectric body 214 , which is seated in hermetic terminal 202 of implantable medical device 204 . At least one feedthrough pin or wire 216 extends across the lossy ferrite inductor 200 in a non-conductive relationship. When used in conjunction with the feedthrough capacitor 208 , the feedthrough terminal pin 216 extends past the capacitor in a conductive relationship with the first set of electrode plates 210 . An oute...

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Abstract

An active implantable medical device (AIMD) feedthrough terminal assembly includes a plurality of wires extending from AIMD electronic circuitry, and a lossy ferrite inductor, the wires passing through the A lossy ferrite inductor for increasing the impedance of the wire at a selected RF frequency and reducing the magnetic flux core saturation of the lossy ferrite inductor through phase cancellation of the signal carried by the wire . Also provided is a process for filtering electromagnetic interference (EMI) of implanted leads extending from an AIMD into bodily fluids or tissue, wherein the leads are subjected to occasional high power electromagnetic fields, such as those produced by, for example, magnetic resonance imaging High power electromagnetic fields generated by medical diagnostic equipment.

Description

[0001] related application [0002] This application is a continuation-in-part of US Patent Application Serial No. 10 / 825,900, filed April 15, 2004, which application is hereby incorporated by application. This application is also a continuation-in-part of US Patent Application Serial No. 10 / 842,967, filed May 10,2004. This application is also a continuation-in-part of US Patent Application Serial No. 10 / 778,954, filed February 12,2004. This application also claims priority to US Provisional Application Serial No. 60 / 607,276, filed September 2, 2004. Background technique [0003] The present invention relates generally to EMI filter assemblies, especially of the type used in active implantable medical devices (AIMD) such as cardiac pacemakers, cardioverter defibrillators, which The assembly decouples internal electronic components of the medical device from undesirable electromagnetic interference (EMI) signals and shields internal electronic components of the medical device...

Claims

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Application Information

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IPC IPC(8): A61N1/375A61B17/00H01F17/00H03H1/00
Inventor 罗伯特·A.·史蒂文森
Owner GREATBATCH SIERRA INC
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