Integral Metallic Joint Based on Electrodeposition

• US 20170359924A1
• Filed: 06/05/2017
• Published: 12/14/2017
• Est. Priority Date: 06/08/2016
• Status: Active Grant

• Current Assignee: Dyconex AG (Micro Systems Schweiz GmbH)
• Original Assignee: Biotronik SE & Company KG
• Inventors: Hauer, Marc
• Granted Patent: US 10,154,617 B2
• Time in Patent Office: Days
• CPC Class Codes: A61M 5/14276 specially adapted for implantation
• CPC Class Codes: A61N 1/0541 Cochlear electrodes
• CPC Class Codes: A61N 1/362 Heart stimulators heart defibrillators A61N1/39
• CPC Class Codes: A61N 1/375 Constructional arrangements, e.g. casings
• CPC Class Codes: A61N 1/37512 Pacemakers
• CPC Class Codes: A61N 1/39 Heart defibrillators
• CPC Class Codes: B81B 7/0058 for protecting against damages due to external chemical or mechanical influences, e.g. shocks or vibrations
• CPC Class Codes: B81B 7/0064 for protecting against electromagnetic or electrostatic interferences
• CPC Class Codes: H01L 21/50 Assembly of semiconductor devices using processes or apparatus not provided for in a single one of the subgroups H01L21/06 - H01L21/326, e.g. sealing of a cap to a base of a container
• CPC Class Codes: H01L 2224/16225 the item being non-metallic, e.g. insulating substrate with or without metallisation
• CPC Class Codes: H01L 23/10 characterised by the material or arrangement of seals between parts, e.g. between cap and base of the container or between leads and walls of the container
• CPC Class Codes: H01L 2924/16152 Cap comprising a cavity for hosting the device, e.g. U-shaped cap
• CPC Class Codes: H05K 5/062 sealed by a material injected between a non-removable cover and a body, e.g. hardening in situ
• CPC Class Codes: H05K 5/069 Other details of the casing, e.g. wall structure, passage for a connector, a cable, a shaft
• CPC Class Codes: H05K 9/0009 with provisions to reduce EMI leakage through the joining parts

Abstract

An electronic assembly, including an encasement joined from at least two casing parts, wherein at least one gap region between two mutually adjoining casing parts is hermetically sealed by a metal layer that is electrodeposited onto the sections of the adjoining casing parts abutting the gap region and bridges the gap region.

Claims

1. An electronic assembly, comprising:

an encasement joined from at least two casing parts, wherein at least one gap region between two mutually adjoining casing parts is hermetically sealed by a metal layer that is electrodeposited onto sections of the adjoining casing parts abutting the gap region and bridges the gap region.

2. The electronic assembly according to claim 1, designed as an implantable electronic medical device, including as a cardiac pacemaker, a cardioverter, a cochlear implant, or a drug dosing pump.

3. The electronic assembly according to claim 1, designed as a hermetically sealed EMI-tight component of an electronic device that is not sealed in the overall.

4. The electronic assembly according to claim 1, wherein at least one of the adjoining casing parts is a metal part comprising an uncoated surface beneath the deposited metal layer.

5. The electronic assembly according to claim 1, wherein at least one of the adjoining casing parts is a non-conducting part, including a plastic part comprising a printed circuit board, or a ceramic part comprising a thick-film substrate, comprising an additional metallization layer beneath the deposited metal layer.

6. The electronic assembly according to claim 1, wherein the mutually adjoining casing parts are joined by way of an adhesive, which substantially fills the gap region and is conductive at least on the outer side thereof.

7. The electronic assembly according to claim 1, wherein the electrodeposited metal layer forms a tight, pore-free layer and comprises an inert metal including gold, platinum or palladium, or a non-inert metal including Cu or Ni.

8. The electronic assembly according to claim 2, wherein the electrodeposited metal layer is provided on a feedthrough of the electronic medical device and bridges and seals the gap region between a flange part and a conductor element of the feedthrough.

9. The electronic assembly according to claim 8, wherein the flange part is made of titanium and partially provided with a noble metal additional part or a noble metal layer, and the conductor element comprises a plastic or ceramic substrate and is partially provided with a noble metal layer.

10. The electronic assembly according to claim 3, wherein one of the adjoining parts is a printed circuit board or a thick-film substrate, and the other part is a metallic cover, and the printed circuit board or the thick-film substrate comprises a partial metal coating, which is configured in keeping with the opening contour of the cover part and serves as a base for the electrodeposited metal layer.

11. The electronic assembly according to claim 1, wherein the electrodeposited metal layer comprises multiple metals in the form of an alloy and/or a layer sequence comprising different metals in each sub-layer.

12. The electronic assembly according to claim 1, wherein the electrodeposited metal layer has a thickness in the range between 0.1 and 100 μ

m.

13. A method for producing an electronic assembly according to claim 1, comprising the following steps:

providing two casing parts that are inherently suitable or prepared for electrodeposition;

arranging the casing parts in a predetermined relative position with respect to one another, which encloses a gap region therebetween, and fixing the relative position of the casing parts;

placing the casing parts fixed in the relative position thereof in an electrolysis bath; and

carrying out an electrodeposition process in the electrolysis bath under method conditions that ensure the deposition of a metal layer bridging and hermetically sealing the gap region.

14. The method according to claim 13, wherein the provision of the casing parts prepared for electrodeposition comprises the at least partial application of a metallization or the joining to a noble metal part of at least one of the casting parts.

15. The method according to claim 13, wherein the fixing of the relative position of the casing parts comprises the bonding thereof by way of a conductive adhesive and at least partial curing of the adhesive.