Electronics package suitable for implantation
The invention is directed to a method of bonding a hermetically sealed electronics package to an electrode or a flexible circuit and the resulting electronics package that is suitable for implantation in living tissue, such as for a retinal or cortical electrode array to enable restoration of sight to certain non-sighted individuals. The hermetically sealed electronics package is directly bonded to the flex circuit or electrode by electroplating a biocompatible material, such as platinum or gold, effectively forming a plated rivet-shaped connection, which bonds the flex circuit to the electronics package. The resulting electronic device is biocompatible and is suitable for long-term implantation in living tissue.
1. An implantable device comprising:
a rigid non-conductive substrate;
a first conductive bond pad on a first surface of the rigid non-conductive substrate;
a tail-ball, including a ball in contact with the conductive bond pad and a wire; and
a flexible circuit including a second conductive bond pad in contact with the ball and a void;
wherein the wire passes through the void in the flexible circuit, is bent back to make contact with the second conductive bond pad and bonds the flexible circuit to the first conductive bond pad.
2. The implantable device according to claim 1 , further comprising adhesive underfill between the rigid non-conductive substrate and the flexible circuit.
3. The implantable device according to claim 1 , further comprising a weld joint between the wire and a third bond pad on the flexible circuit.
4. The implantable device according to claim 1 , further comprising a hermetic electrical package formed on a second surface of the rigid non-conductive substrate.
5. The implantable device according to claim 4 , further comprising a conductive via through the rigid substrate and electrically connected to said first bond pad.
6. The implantable device according to claim 1 , wherein the rigid non-conductive substrate is ceramic.
7. The implantable device according to claim 6 , wherein the ceramic is alumina.
8. The implantable device according to claim 1 , wherein the tail ball is platinum.
9. The implantable device according to claim 1 , wherein the flexible circuit is polyimide and platinum.
10. The implantable device according to claim 3 , wherein the second bond pad and the third bond pad are opposite sides of the same bond pad.
11. The implantable device according to claim 3 , further comprising a locking wire in contact with the wire and the third bond pad.
12. The implantable device according to claim 1 , further comprising a plurality of channels each including first and second bond pads, connected by tail balls.
13. The implantable device according to claim 12 , wherein the flexible circuit includes a plurality of electrodes on an opposite end of the flexible circuit from the second bond pads.
14. The implantable device according to claim 13 , wherein the electrodes are suitable to stimulate neural tissue.
15. The implantable device according to claim 14 , wherein the electrodes are suitable to stimulate visual neural tissue to create the perception of sight.
16. The implantable device according to claim 15 , wherein the electrodes are suitable to stimulate a retina to create the perception of sight.