Glass-metal feedthrough
AssigneeSchott AG
InventorRobert Hettler
Life of this patent
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Abstract
A glass-metal feedthrough consists of an external conductor, a glass material and an internal conductor. The internal conductor has a coefficient of expansion αinternal, the glass material has a coefficient of expansion αglass, and the external conductor has a coefficient of expansion αexternal. The coefficient of expansion of the internal conductor αinternal is greater than the coefficient of expansion of the glass material αglass and the coefficient of expansion of the external conductor αexternal is at least 2 ppm/K, such as at least 4 ppm/K, greater than the coefficient of expansion of the glass material αglass in the temperature range of 20° C. to the glass transformation temperature.
Claims12
A glass-metal feedthrough, consisting of:
- a glass material having a coefficient of expansion αglass;
- an external conductor having a coefficient of expansion αexternal that is greater than the coefficient of expansion of the glass material αglass, a difference between the coefficient of expansion of the external conductor αexternal and the coefficient of expansion of the glass material αglass is at least 2 ppm/K in a temperature range of 20° C. to a glass transformation temperature of the glass material;
- and
- an internal conductor having a coefficient of expansion αinternal that is greater than the coefficient of expansion of the glass material αglass.
An element for insertion into or attachment to a human or animal body or biological living cells containing cell cultures, said element comprising:
- a glass-metal feedthrough comprising:
- a glass material having a coefficient of expansion αglass;
- an external conductor having a coefficient of expansion αexternal that is greater than the coefficient of expansion of the glass material βglass, a difference between the coefficient of expansion of the external conductor αexternal and the coefficient of expansion of the glass material αglass is at least 2 ppm/K in a temperature range of 20° C. to a glass transformation temperature of the glass material;
- and
- an internal conductor having a coefficient of expansion αinternal that is greater than the coefficient of expansion of the glass material αglass, wherein the external conductor and the internal conductor consist of metals having a reduced allergy potential at least in regions which are configured to come into contact with the human or animal body or the cell cultures.
Dependencies are inferred from the claim text.