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Tank filters placed in series with the lead wires or circuits of active medical devices to enhance MRI compatibility

A box-type filter, medical device technology, used in therapy, electrotherapy, etc., can solve problems such as overheating of tissue interfaces, damage to reed switches, etc.

Inactive Publication Date: 2008-12-10
WILSON GREATBATCH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] (2) Broken reed switch
This can cause overheating in the lead or at the tissue interface of the terminal TIP

Method used

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  • Tank filters placed in series with the lead wires or circuits of active medical devices to enhance MRI compatibility
  • Tank filters placed in series with the lead wires or circuits of active medical devices to enhance MRI compatibility
  • Tank filters placed in series with the lead wires or circuits of active medical devices to enhance MRI compatibility

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Experimental program
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Embodiment Construction

[0209] As shown in the figures, for purposes of illustration, the present invention is directed to placing a TANK filter in series with the leads or circuitry of an active medical device to protect the patient and / or the medical device from unwanted electromagnetic interference signals, such as in an MRI or Effects of signals generated during other medical procedures. The present invention also addresses the design, manufacture and adjustment of such TANK filters to be used in leads or active medical devices. As will be more fully described herein, the present invention has broad applicability to external medical devices, probes, catheters, monitoring leads, etc. .

[0210] In the following description, functionally equivalent elements shown in different embodiments will often be denoted by the same reference numerals.

[0211] Figure 1 illustrates various types of active implantable medical devices and external medical devices 100 currently in use. Figure 1 is a diagram of...

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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.

Description

technical field [0001] The present invention relates generally to electromagnetic interference (EMI) tank filter (TANK filter) assemblies, particularly in active implantable medical devices such as pacemakers, cardioverter defibrillators, neurostimulators A TANK filter of the type used in an active implantable medical device (AIMD) that increases the impedance at selected frequencies of the internal electronic circuitry or associated lead parts of a medical device in order to reduce or eliminate the Current induced by a desired electromagnetic interference (EMI) signal. The present invention is also applicable to various commercial, telecommunications, military and space fields. The present invention is also widely applicable to various external medical devices, including externally worn drug pumps, EKG / ECG electrodes, neurostimulators, ventricular assist devices, and the like. The present invention is also broadly applicable to probes, catheters, monitoring leads, etc. that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61N1/00
Inventor C·A·弗里斯R·A·史蒂文森W·S·达布尼
Owner WILSON GREATBATCH LTD
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