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Method for making assembly of pacing lead electrode to coiled conductor

  • US 4,938,822 A
  • Filed: 10/17/1983
  • Issued: 07/03/1990
  • Est. Priority Date: 10/17/1983
  • Status: Expired due to Term
First Claim
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1. A method of manufacturing a pacing lead electrode assembly that includes a coiled conductor within a sleeve electrode having a generally cylindrical inside surface, comprising:

  • selecting an electrically conductive metal sleeve electrode having an electrically conductive generally cylindrical inside surface of a predetermined circumference;

    oversizing an electrically conductive coiled conductor in its generally radial cross-section so as to provide a coil-shaped conductor member having a generally helically shaped uninsulated electrically conductive outer surface that is radially oversized with respect to the electrically conductive inside surface circumference of the sleeve electrode to the extent that the helically shaped outer surface has a average circumference that is greater than the circumference of the generally cylindrical inside surface of the sleeve electrode when the coil-shaped conductor is in a radially untensioned preassembly condition;

    applying adhesive to a free end of the oversized coil-shaped conductor member;

    generally coaxially aligning the free end of the oversized coil-shaped conductor member with a free end of the sleeve electrode;

    radially rotating the oversized coil-shaped conductor member or the sleeve electrode with respect to each other generally along their coaxis;

    engaging the oversized coil-shaped conductor free end and the sleeve electrode free end during said radial rotation step to thereby flow said adhesive to intersticies between said generally helicallv shaped outer surface and to thereby radially decrease the oversized circumference of the free end of the coil-shaped conductor member to the extent that the free end of the coil-shaped conductor member rotates into the free end of the sleeve electrode and is radially tensioned thereby;

    continuing said radial rotation step while permitting longitudinal movement of the coil-shaped conductor member with respect to the sleeve electrode generally along their coaxis, whereby the coil-shaped conductor member moves longitudinally into the sleeve electrode to form an electrode assembly having a plurality of windings of the coiled conductor radially tensioned and springingly urged against and engaged with the electrically conductive generally cylindrical inside surface of the sleeve electrode to enhance electrical contact between the electrically conductive outer surface of the coiled conductor and the electrically generally cylindrical inside surface of the sleeve electrode; and

    setting the adhesive in the intersticies to form an adhesive thread onto said inside surface of the sleeve electrode.

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