Electrical feedthrough, in particular for medical implants
An electrical feedthrough, in particular for use in an electro-medical implant, having a flange enclosing at least one feedthrough bushing and at least one terminal pin enclosed by the at least one feedthrough bushing, the terminal pin having at least one section which can be joined at a lower energy in the interior of the implant.
1. An electrical feedthrough for use in an electro-medical implant comprising:
at least one feedthrough bushing, wherein the at least one feedthrough bushing comprises:
an inner feedthrough bushing disposed at an interior of the implant; and
an outer feedthrough bushing disposed at an exterior of the implant;
a flange which encloses the at least one feedthrough bushing; and
at least one terminal pin, which is enclosed by the at least one feedthrough bushing, wherein the terminal pin has a biocompatible section and a section which can be joined at a low energy in the interior of the implant,
wherein the at least one terminal pin is connected via a hermetically sealed connection to the outer and inner feedthrough bushings, and the outer and inner feedthrough bushings are connected via a hermetically sealed connection to the flange, both hermetically sealed connections using a soldered connection implemented as a glass solder plug, the glass solder plug being delimited by a cavity enclosed by the flange and the outer and inner feedthrough bushings.
2. The electrical feedthrough according to claim 1 , wherein an inner end of the terminal pin is implemented as nailhead-shaped.
3. The electrical feedthrough according to claim 1 , wherein the biocompatible section of the terminal pin comprises Nb, Ta, Ti, Pt, Ir, Zr, Hf, medical stainless steels, Pt/Ir, and/or alloys made of these materials, and/or FeNi, FeNiCo, FeCr, Mo, W, Cr, FeCr, V, Al, and/or alloys with these materials.
4. The electrical feedthrough according to claim 1 , wherein the section of the terminal pin which can be joined at a low energy comprises an attachment, which is located on an inner end of the terminal pin.
5. The electrical feedthrough according to claim 4 , wherein the attachment comprises nickel, copper, palladium, gold, silver, iron, and/or alloys made of these materials.
6. The electrical feedthrough according to claim 4 , wherein the attachment which can be joined at a low energy in the interior of the implant is implemented as a pin.
7. The electrical feedthrough according to claim 6 , further comprising a filter capacitor electrically and mechanically connected to the pin which can be joined at a low energy, wherein the filter capacitor produces a shield between the flange and the at least one terminal pin.
8. The electrical feedthrough according to claim 4 , wherein the attachment which can be joined at a low energy in the interior of the implant is implemented as a disk.
9. The electrical feedthrough according to claim 4 , wherein the attachment which can be joined at low energy in the interior of the implant is joined using soft soldering.
10. The electrical feedthrough according to claim 9 , wherein an interior soft soldering on the at least one terminal pin is executed using a reflow method.
11. The electrical feedthrough according to claim 4 , wherein the attachment which can be joined at a low energy is attached using a joint biocompatible section of the terminal pin.
12. The electrical feedthrough according to claim 11 , wherein the attachment which can be joined at a low energy is attached using the joint biocompatible section of the terminal pin via brazing, welding, crimping, clamping, or gluing on in an electrically conductive manner.
13. The electrical feedthrough according to claim 11 , wherein the attachment which can be joined at a low energy is attached using the joint biocompatible section of the terminal pin via brazing using gold solder.
14. The electrical feedthrough according to claim 11 , wherein the joint is located inside the at least one feedthrough bushing.
15. The electrical feedthrough according to claim 1 , wherein the at least one feedthrough bushing comprises ceramic material.
16. The electrical feedthrough according to claim 15 , wherein the ceramic material comprises aluminum oxide (Al2O3).
17. The electrical feedthrough according to claim 1 , wherein the at least one terminal pin is connected via a hermetically sealed connection to the at least one feedthrough bushing, and/or the at least one feedthrough bushing is connected via a hermetically sealed connection to the flange.
18. The electrical feedthrough according to claim 17 , wherein the hermetically sealed connections comprise soldered connections.
19. The electrical feedthrough according to claim 18 , wherein the soldered connections use a glass solder.
20. A method for producing an electrical feedthrough according to claim 1 , comprising the step of cooling the at least one terminal pin using a heat sink during the generation of the glass solder plug.
21. The electrical feedthrough according to claim 1 , wherein the biocompatible section of the at least one terminal pin and the section of the terminal pin which can be joined at a low energy are connected together at a joint located inside the inner feedthrough bushing.