Implantable microelectronic device and method of manufacture
First Claim
1. A method of making a device having an electrical contact, comprising the steps of:
- providing an electrical device having a non-biocompatible contact pad,forming at least one first patterned conductive layer over said contact pad, having a first layer formed on said contact pad;
forming at least one second patterned conductive layer over said first pattered conductive layer, said second patterned conductive layer having a biocompatible top electrical contact surface,encasing the resulting structure in biocompatible electrical insulator, wherein said biocompatible electrical insulator, said first patterned conductive layer and said second patterned conductive layer from a hermetic seal around the electrical device,forming an aperture in said electrical insulator to expose said biocompatible top electrical contact surface.
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Accused Products
Abstract
An implantable hermetically sealed microelectronic device and method of manufacture are disclosed. The microelectronic device of the present invention is hermetically encased in a insulator, such as alumina formed by ion bean assisted deposition (“IBAD”), with a stack of biocompatible conductive layers extending from a contact pad on the device to an aperture in the hermetic layer. In a preferred embodiment, one or more patterned titanium layers are formed over the device contact pad, and one or more platinum layers are formed over the titanium layers, such that the top surface of the upper platinum layer defines an external, biocompatible electrical contact for the device. Preferably, the bottom conductive layer is larger than the contact pad on the device, and a layer in the stack defines a shoulder.
25 Citations
13 Claims
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1. A method of making a device having an electrical contact, comprising the steps of:
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providing an electrical device having a non-biocompatible contact pad, forming at least one first patterned conductive layer over said contact pad, having a first layer formed on said contact pad; forming at least one second patterned conductive layer over said first pattered conductive layer, said second patterned conductive layer having a biocompatible top electrical contact surface, encasing the resulting structure in biocompatible electrical insulator, wherein said biocompatible electrical insulator, said first patterned conductive layer and said second patterned conductive layer from a hermetic seal around the electrical device, forming an aperture in said electrical insulator to expose said biocompatible top electrical contact surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification