Medtronic, Inc.

Simon E Goldman

Rajesh V Iyer

Thomas P Miltich

Shawn D Knowles

Daniel J Koch

Curtis E Burgardt

Ryan J Jensen

Jennifer J Zhao

Susan A Tettemer

Micah A Litow

Dawit Y Belete

Gordon Orvis Munns

Brad Conrad Tischendorf

Joyce Yamamoto

Gregory John Haubrich

Andrew Jason Thom

William John Taylor

Paul B Aamodt

Scott J Robinson

Jonathan D Edmonson

David B Engmark

David Nghiem

Greg Haubrich

Leroy L Perz

Len D Twetan

Michael E Nowak

Gregory P Shipe

Zhi Fang

Matthew J Sanders

Brian Sorenson

William Michael Brosnan

James A Martin

Fabian A Pena

Stephanie L Sanford

Roger L Hubing

Michael J Galloway

William M Brosnan

Implantable medical systems that include an implantable medical lead coupled to an implantable medical device for purposes of electrical stimulation therapy and/or sensing of physiological signals includes at least one twisted pair of conductors within the implantable medical lead. The twisted pair corresponds to a stimulation or sensing channel of the implantable medical device. The twisted pair provides attenuation of electromagnetic interference noise that is present at the lead or lead extension. The twisted pair may be present in a lumen of the implantable medical lead or encapsulated by the lead body. The twisted pair, along with any other conductors of the lead, may be of a linear configuration or may be coiled.

Implantable medical leads with a twisted pair of conductors

In some examples, a feedthrough assembly a ferrule including a base portion and at least one projection extending from the base portion; a capacitive filter positioned adjacent the base portion of the ferrule such that an outer wall of the capacitive filter faces an inner wall of the at least one projection of the ferrule; a conductive pin extending through an aperture in the ferrule and an aperture in the capacitive filter; and an electrically conductive material between the inner wall of the at least one projection of the ferrule and outer wall of the capacitive filter that electrically couples the ferrule and the capacitive filter to ground the capacitive filter, wherein the inner wall of the at least one projection of the ferrule and the outer wall of the capacitive filter are tapered.

Feedthrough assembly including ferrule with tapered extension(s)

Processes for manufacture and assembly of implantable medical devices are described. In particular, techniques are provided for nondestructive electrical isolation assessment of feedthrough assemblies of the implantable medical devices. The feedthrough assemblies may include an insulating structure, a plurality of terminal pins extending through the insulator and a ferrule having an inner lumen into which the insulating structure is disposed. One or more insulating seals may be disposed at the interface of the ferrule-to-insulating structure and/or the terminal pin-to-insulating structure. The electrical isolation assessments may be based on the dielectric properties of the components of the feedthrough assemblies, such as the insulating structure.

Feedthrough assembly for an implantable medical device

In one example, a filtered feedthrough assembly for a medical device, such as, e.g., an implantable medical device, is described. The filtered feedthrough assembly may comprise a feedthrough comprising at least one feedthrough conductive pathway extending between a first feedthrough side and a second feedthrough side; a capacitive filter array comprising at least one filter array conductive pathway extending between a first filter array side and a second filter array side, and at least one capacitor filter substantially surrounding at least a portion the at least one filter array conductive pathway; and at least one electrically conductive member electrically coupling the at least one filter array conductive pathway to the at least one feedthrough conductive pathway.

Capacitive filtered feedthrough array for implantable medical device

A feedthrough assembly may include a ferrule defining a ferrule opening, a feedthrough at least partially disposed within the ferrule opening, a capacitive filter array at least partially disposed within the ferrule opening, and a lead frame assembly. The feedthrough may include at least one feedthrough conductive pathway and the capacitive filter array may include at least one filter array conductive pathway. The lead frame assembly may include an electrically conductive lead electrically connecting the at least one feedthrough conductive pathway and the at least one filter array conductive pathway.

Feedthrough assembly including a lead frame assembly

Methods for making feedthrough assemblies including a capacitive filter array are disclosed. Methods disclosed include attaching a perimeter wall of the capacitor filter array to an interior wall of a ferrule, depositing a thick film conductive paste within at least one passageway to form a conductive pathway, and heating the ferrule, capacitor filter array and the thick film conductive paste to convert the paste to a relatively solid material.

Methods for making feedthrough assemblies including a capacitive filter array

A feedthrough assembly may include a ferrule defining a ferrule opening, a capacitive filter array at least partially disposed within the ferrule opening, and a feedthrough at least partially disposed within the ferrule opening. In some examples, the capacitive filter array includes a filter array ground conductive pathway. In some examples, the feedthrough includes a feedthrough ground conductive via. The feedthrough ground conductive via may be electrically coupled to the filter array ground conductive pathway, and the feedthrough ground conductive via may be electrically coupled to the ferrule.

Feedthrough assembly including electrical ground through feedthrough substrate

A multilayered feedthrough for an implantable medical device includes a substrate having a first edge, a second edge, and a substrate length. A plurality of traces is formed on the substrate and extends along the substrate length. The plurality of traces extends to the first and second edges of the substrate. An insulator layer is formed on the substrate and the plurality of traces. A ground plane layer is formed on the insulator layer.

Implantable co-fired electrical feedthroughs

An implantable medical device is provided including a housing, an external circuit element extending outwardly from the housing, an internal circuit enclosed by the housing, a feedthrough array disposed along the housing having at least one filtered feedthrough and at least one unfiltered feedthrough, wherein the unfiltered feedthrough is adapted for connection to the outwardly extending circuit element; and including means for minimizing electromagnetic coupling between the filtered feedthrough and the unfiltered feedthrough.

Method and apparatus for minimizing EMI coupling in a feedthrough array having at least one unfiltered feedthrough

A method of forming a filtering capacitor feedthrough assembly for an implantable active medical device includes inserting a terminal pin into an aperture of a capacitor, the capacitor configured to be electrically grounded to an electrically conductive feedthrough ferrule or housing of the implantable active medical device, then disposing an electrically conductive continuous coil within the aperture between the terminal pin and the capacitor and then fixing the continuous coil to the terminal pin or the capacitor. The continuous coil includes an inner diameter defined by a plurality of coils, the terminal pin extending through the inner diameter of the continuous coil so that the plurality of coils circumferentially surround the terminal pin. The electrically conductive continuous coil mechanically secures and electrically couples the terminal pin to the capacitor.

Methods of forming a filtering capacitor feedthrough assembly

A determination of an equivalent series resistance (ESR) effect for high frequency filtering performance of a filtered feed-through assembly is described. A low frequency signal is introduced to a filtered feed-through assembly. ESR limit of the filtered feed-through is determined based on the low frequency signal.

Determination of equivalent series resistance

A filtering capacitor feedthrough assembly for an implantable active medical device is disclosed. The filtering capacitor feedthrough assembly includes a capacitor having an aperture, the capacitor is electrically grounded to an electrically conductive feedthrough ferrule or housing of the implantable active medical device. A terminal pin extends into the aperture and an electrically conductive continuous coil is disposed within the aperture and between the terminal pin and the capacitor. The electrically conductive continuous coil mechanically secures and electrically couples the terminal pin to the capacitor.

Filtering capacitor feedthrough assembly

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St. Louis Park, MN, United States of America

Simon E Goldman