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Extractable implantable medical lead
| Details |
Inventors: Marshall, Mark T.; Shoberg, Bret R.; Padgett, Clare E.; Laske, Timothy G.; Waldhauser, Steven L.; Stewart, Mark T.; Taylor, Catherine E.; Keeney, Kenneth W.;
Assignee: Medtronic, Inc. (Minneapolis, MN)
Primary Examiner: Evanisko; George R.
Assistant Examiner:
Attorney, Agent or Firm: Wolde-Michael; Girma
A medical electrical lead with a tip-ring assembly optimized to resist damage during extraction. The lead includes an elongated plastic tube and at least two elongated conductors mounted in the plastic tube. A tip-ring assembly is mounted to the distal end of the tube, the tip-ring assembly including a ring electrode coupled to one of the conductors, a tip electrode located distal to the ring electrode and coupled to another of the conductors and two molded plastic components separately fabricated of a plastic harder than the plastic tube, adhered to one another and together defining a circumferential groove in which the ring electrode is located and mechanically coupled to the tip electrode. The tip electrode may be provided with a proximally extending electrode shank covered by a tine sleeve which is fabricated of a plastic softer than the molded plastic components and is adhered to more distally located molded plastic component. The more distally located molded plastic component preferably overlaps the electrode shank to provide a stronger structure. |
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DETAILED DESCRIPTION The lead disclosed in the present application is particularly designed to reduce problems associated with extraction after implant.
In order to accomplish this goal, the lead is provided with three structural features, each directed particularly to providing a lead which is easier to extract and less likely to be damaged during the extraction process.
The first feature of the lead is an improved tip-ring assembly, extending from the tip or distal electrode and including the associated ring electrode located proximal thereto.
In particular, the tip-ring assembly is adapted for use in conjunction with electrodes employing passive fixation mechanisms such as tines, in which the tip electrode is fixedly mounted with respect to the lead body, rather than advanceable from the lead body as in the context of a screw-in lead.
In order to enhance the durability of the lead during the extraction, the tip-ring assembly is fabricated of three molded plastic components, two of which are fabricated of a relatively rigid plastic, harder than that typically employed in the segment between the tip and ring electrode in bipolar leads employing passive fixation mechanisms.
The plastic components are configured to provide a mechanical interlock between the tip electrode and the ring electrode when assembled, and are additionally bonded to plastic insulative tubes or coatings covering coiled and/or cabled conductors extending to the tip-ring assembly area.
In particular, the tip-ring assembly includes a tine sleeve having a central lumen into which a proximal extending shank portion of the tip electrode is inserted, a tip-ring spacer component, adapted to be glued to the proximal end of the tine sleeve and a ring-coil spacer component, adapted to be glued to the tip-ring spacer component, and around which a ring electrode may be located.
The ring-coil and tip-ring spacer components together define a circumferential groove dimensioned to receive and retain the ring electrode.
The distal end of the tip-ring spacer is configured to overlap the proximal end of the electrode shank located within the tine sheath, so that an generally rigid assembly is provided extending from the distal or tip electrode through and including the ring electrode of the lead
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Metal Working 
