Metallic housing for implant with recesses for eddy current reduction

• US 5,913,881 A
• Filed: 10/23/1997
• Issued: 06/22/1999
• Est. Priority Date: 10/23/1996
• Status: Expired due to Term

• Current Assignee: Biotronik Mess-Und Therapiegeraete GmbH & Company Ingenieurbuero Berlin (Biotronik SE & Company KG)
• Original Assignee: Biotronik Mess-Und Therapiegeraete GmbH & Company Ingenieurbuero Berlin (Biotronik SE & Company KG)
• Inventors: Fischer, Gerhard, Benz, Hans-Thomas
• Primary Examiner(s): Kamm, William E.
• Assistant Examiner(s): SCHAETZLE, KENNEDY
• Application Number:
  US08/956,470
• Time in Patent Office: 607 Days
• Field of Search: 607/36, 607/30, 607/32, 607/119, 607/4, 607/9, 607/33, 128/903
• US Class Current: 607/36
• CPC Class Codes: A61F 2250/0001 Means for transferring electromagnetic energy to implants
• CPC Class Codes: A61N 1/37512 Pacemakers

Abstract

An implant for implanting into human tissue includes a hermetically sealed, metallic housing for enclosing electronic means inside the housing for a high-frequency, telemetric information transfer between a programming device and the implant. The implant additionally includes a head for connecting a stimulation line. The housing comprises a metallic wall including groove-shaped recesses arranged at least on an inside of the metallic wall and which reduce a thickness of the metallic wall so that in a region of the recesses on the housing wall a material thickness does not fall below that which is necessary under operating conditions to ensure that the housing is impermeable to fluids.

Claims

1. An implant for implanting into human tissue, comprising:

a hermetically sealed, metallic housing for enclosing electronic means inside the housing for a high-frequency, telemetric information transfer between a programming device and the implant, the implant including a head for connecting a stimulation line, wherein the housing comprises a metallic wall including groove-shaped recesses arranged at least on an inside of the metallic wall and which reduce a thickness of the metallic wall so that in a region of the recesses on the housing wall a material thickness does not fall below that which is necessary under operating conditions to ensure that the housing is impermeable to fluids.

2. The implant according to claim 1, wherein the groove-shaped recesses are additionally arranged on an outside wall of the housing.

3. The implant according to claim 1, wherein the groove-shaped recesses are arranged on a wall region of the housing which covers a telemetric route of the electronic means.

4. The implant according to claim 1, further including a filler material of an electrically non-conductive material filling the groove-shaped recesses.

5. The implant according to claim 4, wherein the filler material comprises a plastic material.

6. The implant according to claim 5, wherein the plastic filler material comprises polyester resin.

7. The implant according to claim 1, wherein the groove-shaped recesses extend essentially parallel to each other and crosswise to a longitudinal axis of the head.

8. The implant according to claim 7, wherein the groove-shaped recesses are divided respectively into two segments of different length that are positioned on the same axis to form respective rows.

9. The implant according to claim 8, wherein a sequence of the segments with unequal length in each row changes from one row to an adjacent row of the recesses.

10. The implant according to claim 1, wherein a strength of the metallic wall is reduced by at least 60% in the region of the recesses.

11. The implant according to claim 1, wherein the groove-shaped recesses extend over a total broadside of the housing and are distributed evenly.

12. The implant according to claim 1, wherein the groove-shaped recesses have an essentially parallelepiped shape.

13. The implant according to claim 12, wherein the groove-shaped recesses have end regions with a semi-cylindrical shape.

14. The implant according to claim 1, wherein the housing includes material regions of reduced electrical conductivity, caused by one of localized oxygen implantation, localized alloy-formation and localized impurities inserted into the structure.

15. The implant according to claim 1, wherein the housing comprises titanium.

16. The implant according to claim 1, wherein the implant comprises a pacemaker.

17. The implant according to claim 1, wherein a strength of the metallic wall is reduced by at least 80% in the region of the recesses.

18. An implant for implanting into human tissue, comprising:

a hermetically sealed, metallic housing for enclosing electronic means inside the housing for a high-frequency, telemetric information transfer between a programming device and the implant, the implant including a head for connecting a stimulation line, wherein the housing comprises;

a metallic wall including groove-shaped recesses arranged at least on one of an inside and outside of the metallic wall and which reduce a thickness of the metallic wall so that in a region of the recesses on the housing wall a material thickness does not fall below that which is necessary under operating conditions to ensure that the housing is impermeable to fluids; and

a material filling the recesses to effectively compensate for a mechanical instability caused by the recesses.

19. The implant according to claim 18, wherein the material filling the recesses comprises a plastic material.

20. The implant according to claim 18, wherein the plastic material comprises polyester resin.

21. The implant according to claim 18, wherein the plastic material comprises epoxy resin.

22. The implant according to claim 18, wherein the material completely fills the recesses.

23. An implant for implanting into human tissue, comprising:

a hermetically sealed, metallic housing for enclosing electronic means inside the housing for a high-frequency, telemetric information transfer between a programming device and the implant, the implant including a head for connecting a stimulation line, wherein the housing comprises a metallic wall including groove-shaped recesses arranged in parallel rows at least on one of an inside and outside of the metallic wall and which reduce a thickness of the metallic wall so that in a region of the recesses on the housing wall a material thickness does not fall below that which is necessary under operating conditions to ensure that the housing is impermeable to fluids, and wherein the groove-shaped recesses are divided respectively into two segments of different length that are positioned on the same axis in each row.

24. The implant according to claim 23, wherein a sequence of the segments with unequal length in each row changes from one row to an adjacent row of the recesses.

25. The implant according to claim 23, wherein the head has a longitudinal axis and the parallel rows of recesses extend crosswise to the longitudinal axis of the head.