Full Perimeter Laser Beam Button Weld of Dissimilar Materials
AssigneeGreatbatch Ltd.
InventorsKen Talamine, Keith Seitz, Tim Weiskopff, Donald Anthony Bonitati
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Abstract
Terminal pins comprising a refractory metal forming a full perimeter weld connected to a terminal block comprising a dissimilar metal incorporated into feedthrough filter capacitor assemblies are discussed. The feedthrough filter capacitor assemblies are particularly useful for incorporation into implantable medical devices such as cardiac pacemakers, cardioverter defibrillators, and the like, to decouple and shield internal electronic components of the medical device from undesirable electromagnetic interference (EMI) signals.
Claims26
A feedthrough assembly, which comprises:
- a) an insulator of electrically nonconductive material having a height defined by an insulator sidewall extending to a first insulator end and a second insulator end, wherein the insulator has at least one terminal pin bore extending from the first end to the second end thereof;
- b) a terminal pin received in the terminal pin bore, the terminal pin having a sidewall extending to opposed first and second ends disposed spaced from the respective first and second insulator ends, wherein the terminal pin comprises a first metal;
- c) a ferrule of an electrically conductive material and comprising a ferrule opening defined by a surrounding sidewall extending to a first ferrule end and a second ferrule end, wherein the insulator is supported in the ferrule opening;
- d) a first braze material contacting the terminal pin thereby hermetically sealing the terminal pin to the insulator and a second braze material hermetically sealing the insulator to the ferrule;
- and
- f) wherein a terminal block, comprising a second metal, is positioned such that the terminal pin extends through a terminal block through bore, wherein the terminal pin is joined to the terminal block.
A method for providing a feedthrough assembly, comprising the steps of:
- a) providing a feedthrough comprising:
- i) an insulator of electrically non-conductive material having a height defined by an insulator sidewall extending to a first insulator end and a second insulator end, wherein the insulator has at least one terminal pin bore extending from the first end to the second end thereof;
- ii) a terminal pin received in the terminal pin bore, the terminal pin having a sidewall extending to opposed first and second ends disposed spaced from the respective first and second insulator ends, wherein the terminal pin comprises a first metal;
- iii) a ferrule of an electrically conductive material and comprising a ferrule opening defined by a surrounding sidewall extending to a first ferrule end and a second ferrule end, wherein the insulator is supported in the ferrule opening;
- iv) a first braze material contacting the terminal pin thereby hermetically sealing the terminal pin to the insulator and a second braze material hermetically sealing the insulator to the ferrule;
- and
- v) wherein a terminal block, comprising a second metal, is positioned such that the terminal pin extends through a terminal block through bore, wherein the terminal pin is joined to the terminal block;
- and
- b) joining the proximal end portion of the terminal pin to the terminal block.
Dependencies are inferred from the claim text.