Glass-metal feedthrough

Patent metadata

Field	Value
Publication number	US-11728156-B2
Application number	US-202117518054-A
Country	US
Kind code	B2
Filing date	Nov 3, 2021
Priority date	Jul 20, 2018
Publication date	Aug 15, 2023
Grant date	Aug 15, 2023

Abstract

A glass-metal feedthrough includes: an external conductor having a coefficient of expansion αexternal, and having an opening formed therein; an internal conductor disposed in the opening, the internal conductor including iron and having a coefficient of expansion αinternal, the external conductor and the internal conductor being configured to not release nickel when in contact with a human or animal body or biological cells of a cell culture; and a glass material surrounding the internal conductor within the opening and having a coefficient of expansion αglass, the coefficient of expansion of the internal conductor αinternal and the coefficient of expansion of the external conductor αexternal are such that a joint pressure on the internal conductor of at least 30 MPa is generated in a temperature range of 20° C. to a glass transformation temperature of the glass material.

First claim

What is claimed is:

1. A glass-metal feedthrough, comprising:
an external conductor having a coefficient of expansion α external , and having an opening formed therein;
an internal conductor disposed in the opening, the internal conductor comprising iron and having a coefficient of expansion α external , the external conductor and the internal conductor being configured to not release nickel when in contact with a human or animal body or biological cells of a cell culture; and
a glass material surrounding the internal conductor within the opening and having a coefficient of expansion α glass , the coefficient of expansion of the internal conductor α internal and the coefficient of expansion of the external conductor α external are such that a joint pressure on the internal conductor of at least 30 MPa is generated in a temperature range of 20° C. to a glass transformation temperature of the glass material.

2. The glass-metal feedthrough of claim 1 , wherein the internal conductor is hermetically sealed within the opening.

3. The glass-metal feedthrough of claim 2 , wherein a helium leakage of the glass-metal feedthrough is less than 1*10 −8 mbar/sec.

4. The glass-metal feedthrough of claim 1 , wherein the coefficient of expansion α internal of the internal conductor is greater than the coefficient of expansion α glass of the glass material.

5. The glass-metal feedthrough of claim 4 , wherein a difference between the coefficient of expansion of the external conductor α external and the coefficient of expansion α glass of the glass material is at least 2 ppm/K.

6. The glass-metal feedthrough of claim 5 , wherein the coefficient of expansion of the external conductor α external is greater than the coefficient of expansion α glass of the glass material.

7. The glass-metal feedthrough of claim 4 , wherein the coefficient of expansion of the internal conductor α internal is 1.1 times greater than the coefficient of expansion α glass of the glass material.

8. The glass-metal feedthrough of claim 7 , wherein the coefficient of expansion of the internal conductor α internal is 1.1 to 2 times greater than the coefficient of expansion α glass of the glass material.

9. The glass-metal feedthrough of claim 4 , wherein the difference between the coefficient of expansion of the external conductor α external and the coefficient of expansion α glass of the glass material is at least 4 ppm/K.

10. The glass-metal feedthrough of claim 1 , wherein the coefficient of expansion of the internal conductor α internal and the coefficient of expansion of the external conductor α external are such that a joint pressure on the internal conductor of at least 50 MPa is generated in a temperature range of 20° C. to a glass transformation temperature of the glass material.

11. An element for insertion into or attachment to a human or animal body or biological living cells containing cell cultures, the element comprising:
a glass-metal feedthrough comprising:
an external conductor having a coefficient of expansion α external , and having an opening formed therein;
an internal conductor disposed in the opening, the internal conductor comprising iron and having a coefficient of expansion α internal , the external conductor and the internal conductor being configured to not release nickel when in contact with a human or animal body or biological cells of a cell culture; and
a glass material surrounding the internal conductor within the opening and having a coefficient of expansion α glass , the coefficient of expansion of the internal conductor α internal and the coefficient of expansion of the external conductor α external are such that a joint pressure on the internal conductor of at least 30 MPa is generated in a temperature range of 20° C. to a glass transformation temperature of the glass material.

12. The element of claim 11 , wherein the internal conductor is hermetically sealed within the opening.

13. The element of claim 12 , wherein a helium leakage of the glass-metal feedthrough is less than 1*10 −8 mbar/sec.

14. The element of claim 11 , wherein the coefficient of expansion α internal of the internal conductor is greater than the coefficient of expansion α glass of the glass material.

15. The element of claim 14 , wherein a difference between the coefficient of expansion of the external conductor α external and the coefficient of expansion α glass of the glass material is at least 2 ppm/K.

16. The element of claim 15 , wherein the coefficient of expansion of the external conductor α external is greater than the coefficient of expansion α glass of the glass material.

17. The element of claim 14 , wherein the coefficient of expansion of the internal conductor α internal is 1.1 times greater than the coefficient of expansion α glass of the glass material.

18. The element of claim 17 , wherein the coefficient of expansion of the internal conductor α internal is 1.1 to 2 times greater than the coefficient of expansion α glass of the glass material.

19. The element of claim 14 , wherein the difference between the coefficient of expansion of the external conductor α external and the coefficient of expansion α glass of the glass material is at least 4 ppm/K.

20. The element of claim 11 , wherein the coefficient of expansion of the internal conductor α internal and the coefficient of expansion of the external conductor α external are such that a joint pressure on the internal conductor of at least 50 MPa is generated in a temperature range of 20° C. to a glass transformation temperature of the glass material.

Assignees

• Schott Ag

Inventors

• Hettler Robert

Classifications

• H01J61/366 Primary

  Seals for leading-in conductors · CPC title

• B60R21/26

  characterised by the inflation fluid source or means to control inflation fluid flow {(arrangement or mounting thereof to the vehicle B60R21/20; blasting cartridges for producing gas under pressure in general F42B3/04; initiators or igniters therefor F42B3/10)} · CPC title

• B60R22/34

  Belt retractors, e.g. reels (anchoring devices {, e.g. guide loops} , with means to tension the belt in an emergency B60R22/195) · CPC title

• C03C27/02

  by fusing glass directly to metal · CPC title

• F42B3/107

  Sealing-plugs characterised by the material used · CPC title