Filtered feedthrough assembly and associated method
A system and method for sealing a capacitor bottom in a filtered feedthrough. The feedthrough comprises a ferrule, a capacitor, at least one terminal pin and a support structure. The support structure includes at least one projection that extends into an aperture of the capacitor. The projection includes an opening through which the at least one terminal pin extends such that, in an assembled state, the terminal pin extends through the opening of the projection and the aperture of the capacitor.
1. A filtered feedthrough assembly, comprising:
a ferrule;
a capacitor comprising a top portion, a bottom portion, and an inner diameter portion, wherein the inner diameter portion defines at least one aperture extending from the top portion to the bottom portion;
at least one terminal pin extending through the at least one aperture and having an outer diameter; and
a support structure configured to be received within the ferrule comprising at least one deformable projection extending from a first side, the at least one projection comprising an inner circumference defining an opening extending through the support structure to a second side opposing the first side, wherein the at least one projection extends into the at least one aperture of the capacitor and the at least one terminal pin extends through the opening, the support structure coupled to the capacitor through a frictional fit of the projection into the at least one aperture of the capacitor and a direct frictional fit of the at least one terminal pin in the deformed opening in the projection and without the use of non-conductive epoxy, wherein the outer diameter of the pin is greater than the inner circumference of the opening when non-deformed.
2. The filtered feedthrough assembly of claim 1 , the opening being configured to mate with the at least one terminal pin.
3. The filtered feedthrough assembly of claim 1 , wherein the at least one projection comprises a bifurcated cylindrical base portion.
4. The filtered feedthrough assembly of claim 1 , wherein the opening tapers from the second side to the first side such that the opening has a conical cross-section.
5. The filtered feedthrough assembly of claim 1 , wherein the support structure comprises a polyetheretherketone material.
6. The filtered feedthrough assembly of claim 1 , wherein the support structure rests on an inner ledge of the ferrule.
7. The filtered feedthrough assembly of claim 1 , wherein the capacitor further comprise an outer diameter portion, the inner diameter portion being electrically coupled to the at least one terminal pin and the outer diameter portion being electrically coupled to the ferrule.
8. The filtered feedthrough assembly of claim 1 , wherein the at least one projection comprises a cylindrical base portion and a chamfered portion.
9. The filtered feedthrough assembly of claim 1 , wherein the support portion assists in centering the at least one terminal pin within the at least one aperture.
10. The filtered feedthrough assembly of claim 1 , wherein the at least one deformable projection is split into two or more portions.
11. A method of assembling a filtered feedthrough assembly, comprising:
inserting at least one terminal pin within a ferrule, the terminal pin having an outer diameter;
inserting a support structure within the ferrule, the support structure comprising at least one deformable projection extending from a first side, the at least one projection comprising an inner circumference defining an opening extending through the support structure to a second side opposing the first side, the outer diameter of the pin is greater than the inner circumference of the opening when non-deformed; and
inserting a capacitor within the ferrule, the capacitor comprising a top portion, a bottom portion, and an inner diameter portion, wherein the inner diameter portion defines at least one aperture extending from the top portion to the bottom portion, wherein:
the at least one projection extends into the at least one aperture of the capacitor; and
the at least one terminal pin extends through and deforms the opening and extends through the at least one aperture, the support structure coupled to the capacitor through a frictional fit of the projection into the at least one aperture of the capacitor and a direct frictional fit of the at least one terminal pin in the opening in the projection and without the use of non-conductive epoxy.
12. The method of claim 11 , wherein the at least one projection comprises a bifurcated cylindrical base portion.
13. The method of claim 11 , wherein the opening tapers from the second side to the first side such that the opening has a conical cross-section.
14. The method of claim 11 , wherein the support structure comprises a polyetheretherketone material.
15. The method of claim 11 , wherein the support structure rests on an inner ledge of the ferrule when inserted within the ferrule.
16. The method of claim 11 , wherein the capacitor further comprises an outer diameter portion, the method further comprising:
electrically coupling the inner diameter portion to the at least one terminal pin; and
electrically coupling the outer diameter portion to the ferrule.
17. The method of claim 11 , wherein the at least one projection comprises a cylindrical base portion and a chamfered portion.
18. The method of claim 11 , wherein the support portion assists in centering the at least one terminal pin within the at least one aperture.