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Implantable infusion device and method of manufacture thereof

  • US 5,147,483 A
  • Filed: 04/13/1990
  • Issued: 09/15/1992
  • Est. Priority Date: 04/26/1989
  • Status: Expired due to Term
First Claim
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1. A method of manufacturing an implantable infusion apparatus having:

  • (a) housing means for forming an infusate chamber, said housing means including;

    (i) a generally tubular wall section disposed about said chamber, said wall section including an interior surface,(ii) a base closing said wall section proximate a bottom end thereof,(iii) an entry port into said chamber at a top end of said housing means, and(iv) a ledge disposed intermediate said entry port and chamber,(B) means for closing said entry port including a self-sealing, penetrable septum of resilient material disposable on said ledge,(C) means defining a fluid outlet passage from said chamber for selectively delivering infusate therefrom, said passage defining means including a hollow exterior stem having a stem end and connected to said housing means,said method comprising the steps of;

    forming a socket in said wall section,providing said stem end with a circular ridge of reduced cross-section,seating said stem end in said socket;

    generating sufficient heat by resistance welding so as to melt said ridge and flow the melted material about said stem end thereby creating a secure butt weld with said wall section,after said joining step, disposing said septum on said ledge to close said entry port, including installing said septum from said top end of said housing, andretaining said septum at least partially within said entry port.

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