Body implanted device with electrical feedthrough

• US 6,090,503 A
• Filed: 04/16/1998
• Issued: 07/18/2000
• Est. Priority Date: 10/11/1989
• Status: Expired due to Term

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Kraska, Robert E., Lessar, Joseph F., Taylor, William J., Halperin, Louis E.
• Primary Examiner(s): Nuzzolillo, Maria
• Assistant Examiner(s): Ruthkosky, Mark
• Application Number:
  US09/061,402
• Time in Patent Office: 824 Days
• Field of Search: 429/181, 174/50, 174/61
• US Class Current: 429/181
• CPC Class Codes: C03C 29/00 Joining metals with the aid of glass
• CPC Class Codes: C03C 8/24 Fusion seal compositions being frit compositions having non-frit additions, i.e. for use as seals between dissimilar materials, e.g. glass and metal; Glass solders
• CPC Class Codes: H01M 50/186 characterised by the disposition of the sealing members
• CPC Class Codes: H01M 50/191 Inorganic material
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A body implanted device including a container having an opening through which extends an electrical feedthrough. The feedthrough includes a terminal of bio-stable material. A glass insulator is positioned around the terminal. The glass insulator is chosen from a CABAL-12 type composition or variation thereof. The terminal is comprised of a material which has thermal expansion characteristics compatible with the glass seal. For glass seals having a thermal expansion in the range of 6.8 to 8.0×10^-6 in/in/° C. the terminal is comprised of a thin layer of titanium metallurgically clad over niobium or tantalum. For glass seals having a thermal expansion in the range of 8.0 to 9.0×10^-6 in/in/° C. the terminal is comprised of platinum, platinum-iridium or alloys of either, or of pure titanium.

Claims

1. A body implanted device comprising:

a container having an opening between the exterior and interior of said container;

an electrical terminal extending from the interior of said container through the opening in said container to the exterior of said container, said electrical terminal selected from the group consisting of platinum, platinum-iridium alloys, titanium or titanium clad over niobium or tantalum to a thickness in the range of 50 to 300 microinches; and

a glass insulator positioned around a portion of said terminal in sealing engagement with said terminal and said container, said glass insulator having a chemical composition consisting essentially of about 20 mole % Al₂ O₃, about 20 mole % CaO, between about 1 mole % and 15 mole % SiO₂, between about 25 mole % and 40 mole % B₂ O₃, between about 0 mole % and 20 mole % MgO, between about 0 mole % and 20 mole % BaO and between about 0 mole % and 10 mole % SrO.

2. A body implanted device according to claim 1 further including a sleeve or header attached to said container, said sleeve or header positioned between said glass insulator and said container around a portion of said glass insulator for receiving same in sealing engagement therewith, said sleeve or header comprising titanium or a titanium alloy.

3. A body implanted device according to claim 2 wherein said sleeve or header is titanium alloy Ti--6Al--4V.

4. A body implanted device according to claim 1 wherein said electrical terminal is selected from the group consisting of platinum, platinum-iridium alloys or titanium and wherein said glass insulator has a chemical composition consisting essentially of about 20 mole % Al₂ O₃, about 20 mole % CaO, about 10 mole % SiO₂, about 30 mole % B₂ O₃, between about 10 mole % and 20 mole % BaO and between about 0 mole % and 10 mole % SrO.

5. A body implanted device according to claim 1 wherein said electrical terminal is selected from the group consisting of platinum or platinum-iridium alloys or titanium and wherein the range of chemical compositions of said glass insulator are chosen such that said glass insulator has a thermal expansion of between about 8.0 and 9.0×

10^-6 inches per inch per degree centigrade.

6. A body implanted device according to claim 1 wherein said electrical terminal is comprised of titanium clad over niobium or tantalum and wherein said glass insulator has a chemical composition consisting essentially of about 20 mole % Al₂ O₃, about 20 mole % CaO, between about 1 mole % and 15 mole % SiO₂, between about 25 mole % and 40 mole % B₂ O₃, between about 0 mole % and 20 mole % MgO, between about 0 mole % and 20 mole % BaO.

7. A body implanted device according to claim 1 wherein said electrical terminal is comprised of titanium clad over niobium or tantalum and wherein the range of chemical compositions of said glass insulator are chosen such that said glass insulator has a thermal expansion of between about 6.8 and 8.0×

10^-6 inches per inch per degree centigrade.

8. A body implanted device according to claim 1 further comprising a sleeve or header attached to said container, said sleeve or header positioned around a portion of said glass insulator for receiving same in sealing engagement therewith, said sleeve or header comprising titanium or a titanium alloy.

11. A body implanted device according to claim 2, wherein the sleeve or header is titanium alloy Ti--6Al--4V.

12. A body implanted device according to claim 1, wherein the electrical terminal is selected from the group consisting of platinum, platinum-iridium alloys or titanium and wherein the glass insulator has a chemical composition consisting essentially of about 20 mole % Al₂ O₃, about 20 mole % CaO, about 10 mole % SiO₂, about 30 mole % B₂ O₃, between about 10 mole % and about 20 mole % BaO and between about 0 mole % and about 10 mole % SrO.

13. A body implanted device according to claim 1, wherein the electrical terminal is selected from the group consisting of platinum or platinum-iridium alloys or titanium and wherein the range of chemical compositions of the glass insulator are chosen such that the glass insulator has a thermal expansion of between about 8.0 and 9.0×

10^-6 inches per inch per degree centigrade.

14. A body implanted device according to claim 1, wherein the electrical terminal is comprised of titanium clad over niobium or tantalum and wherein the glass insulator has a chemical composition consisting essentially of about 20 mole % Al₂ O₃, about 20 mole % CaO, between about 1 mole % and about 15 mole % SiO₂, between about 25 mole % and about 40 mole % B₂ O₃, about 20 mole % CaO, between about 0 mole % and about 20 mole % MgO, between about 0 mole % and about 20 mole % BaO.

15. A body implanted device according to claim 1, wherein the electrical terminal comprises titanium clad over niobium or tantalum and wherein the range of chemical compositions of the glass insulator are chosen such that the glass insulator has a thermal expansion of between about 6.8 and about 8.0×

10^-6 inches per inch per degree centigrade.

16. A body implanted device according to claim 1, further comprising a sleeve or header attached to the container, the sleeve or header positioned around a portion of the glass insulator for receiving same in sealing engagement therewith, the sleeve or header comprising titanium or a titanium alloy.

17. The body implanted device according to claim 1, wherein an exterior surface of the glass insulator, the exterior of the container, the electrical terminal extending to the exterior of the container, and the exterior surface of the glass insulator are all subject to contact with body fluids.

9. A body implanted device comprising:

a container having an opening between the exterior and interior of the container;

an electrical terminal extending from the interior of the container through the opening in the container to the exterior of the container, the electrical terminal consisting essentially of a material selected from the group consisting of platinum, platinum-iridium alloys, titanium, niobium, and tantalum; and

a glass insulator positioned around a portion of the terminal in sealing engagement with the terminal and the container, the glass insulator having a chemical composition consisting essentially of about 20 mole % Al₂ O₃, about 20 mole % CaO, between about 10 mole % and about 15 mole % SiO₂, between about 25 mole % and about 40 mole % B₂ O₃, between about 0 mole % and about 20 mole % MgO, between about 0 mole % and about 20 mole % BaO, and between about 0 mole % and about 10 mole % SrO.

10. A body implanted device according to claim 9, further comprising a sleeve or header attached to the container, the sleeve or header positioned between the glass insulator and the container around a portion of the glass insulator for receiving same in sealing engagement therewith, the sleeve or header comprising titanium or a titanium alloy.

18. The body implanted device according to claim 9, wherein an exterior surface of the glass insulator, the exterior of the container, the electrical terminal extending to the exterior of the container, and the exterior surface of the glass insulator are all subject to contact with body fluids.