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US 2010/0305654 A1Published application
Electromagnetic Interference Shielding in an Implantable Medical Device
AssigneeCameron Health, Inc.
InventorTimothy A. Fonte
Life of this patent
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Abstract
EMI shields for use in implantable medical devices that include inner and outer metal layers separated by a dielectric layer. When assembled as medical devices, the outer metal layer of an illustrative EMI shield is placed into electrical contact with a conductive inner surface of an associated canister for an implantable medical device.
Claims20
An implantable medical device (IMD) comprising:
- canister means containing circuitry;
- operational circuitry disposed in the canister means, the operational circuitry having a reference ground;
- and
- shield means for shielding the operational circuitry from voltage potentials;
- wherein:
- the shield means includes a multi-layer structure having an outer layer that is substantially conductive;
- the shield means is disposed between the operational circuitry and the canister means such that air gaps exist between the shield means and the canister means, with the substantially conductive outer layer in contact at one or more locations with the canister means;
- and
- the contact between the outer layer and the outer canister prevents large potential drops across the air gaps, substantially preventing corona discharge.
6 more elements
A method of treating a patient comprising implanting an implantable cardiac stimulus device (ICSD), wherein the ICSD comprises:
- operational circuitry adapted to sense cardiac activity and provide cardiac stimulus output;
- a canister made of a conductive metal and forming a housing for containing the operational circuitry, the housing having first and second major faces;
- and
- an EMI shield comprising an outer metal layer and an inner metal layer with a dielectric therebetween;
- wherein the EMI shield separates the operational circuitry from one of the major faces of the housing such that the outer metal layer is in electrically conductive contact with the canister.
2 more elements
An implantable medical device (IMD) comprising:
- circuitry including a microcontroller, logic, components and memory;
- a housing for containing the circuitry;
- and
- an electromagnetic interference (EMI) shield for protecting the circuitry;
- wherein:
- the EMI shield is disposed around the circuitry and inside the housing such that gaps exist between the EMI shield and the housing;
- and
- the EMI shield comprises anti-Corona means for preventing the gaps from becoming sources for nonlinear electrical conduction between the EMI shield and the housing.
5 more elements
Dependencies are inferred from the claim text.