Electrochemical sensor chip
First Claim
1. A device comprising:
- a polymeric material, wherein the polymeric material has a shape that includes a mounting surface formed to be mounted to an external body surface;
a first substrate at least partially embedded within the polymeric material;
a conductive interconnect disposed on the first substrate;
an electrochemical sensor disposed on the first substrate, wherein the electrochemical sensor comprises;
a sensor substrate different from the first substrate, wherein the sensor substrate includes a first side and a second side opposite the first side;
a working electrode disposed on the first side of the sensor substrate;
a reference electrode disposed on the first side of the sensor substrate;
a first conductive connection pad disposed on the second side of the sensor substrate, wherein the first conductive connection pad is electrically coupled to the working electrode; and
a second conductive connection pad disposed on the second side of the sensor substrate, wherein the second conductive connection pad is electrically coupled to the reference electrode; and
a controller electrically connected to the electrochemical sensor via the first and second conductive connection pads, wherein the controller is electrically connected to the first conductive connection pad via the interconnect, wherein the controller is disposed on the first substrate, and wherein the controller is configured to;
apply a voltage between the working electrode and the reference electrode sufficient to generate an amperometric current related to the concentration of an analyte in a fluid to which the device is exposed.
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Accused Products
Abstract
An electrochemical sensor is disposed on a sensor substrate suitable for flip-chip mounting to another substrate. The electrochemical sensor can be fabricated in bulk by patterning sets of electrodes on a common substrate with vias that electrically couple each electrode to a conductive pad on the opposite side of the substrate. The substrate with electrodes thereon can then be diced and the individual electrochemical sensors can be flip-chip mounted in a body-mountable device in which the sensor can be used to obtain analyte concentrations. As a result, fabrication of the electrochemical sensor electrodes can be isolated from fabrication of the other electronics in the device, which can facilitate efficient fabrication of the sensor and allows for other electronics to be fabricated without restrictions associated with the electrode fabrication.
17 Citations
12 Claims
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1. A device comprising:
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a polymeric material, wherein the polymeric material has a shape that includes a mounting surface formed to be mounted to an external body surface; a first substrate at least partially embedded within the polymeric material; a conductive interconnect disposed on the first substrate; an electrochemical sensor disposed on the first substrate, wherein the electrochemical sensor comprises; a sensor substrate different from the first substrate, wherein the sensor substrate includes a first side and a second side opposite the first side; a working electrode disposed on the first side of the sensor substrate; a reference electrode disposed on the first side of the sensor substrate; a first conductive connection pad disposed on the second side of the sensor substrate, wherein the first conductive connection pad is electrically coupled to the working electrode; and a second conductive connection pad disposed on the second side of the sensor substrate, wherein the second conductive connection pad is electrically coupled to the reference electrode; and a controller electrically connected to the electrochemical sensor via the first and second conductive connection pads, wherein the controller is electrically connected to the first conductive connection pad via the interconnect, wherein the controller is disposed on the first substrate, and wherein the controller is configured to;
apply a voltage between the working electrode and the reference electrode sufficient to generate an amperometric current related to the concentration of an analyte in a fluid to which the device is exposed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method comprising:
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applying, via controller, a voltage between a working electrode and a reference electrode of an electrochemical sensor, wherein the applied voltage is sufficient to generate an amperometric current related to the concentration of an analyte in a fluid to which the electrochemical sensor is exposed, wherein the working electrode and the reference electrode are each disposed on a first side of a sensor substrate, wherein a first conductive pad and a second conductive pad are situated on a second side of the sensor substrate opposite the first side, the first conductive pad and the second conductive pad being electrically coupled to the working electrode and the reference electrode, respectively, wherein the controller, a conductive interconnect, and the electrochemical sensor are disposed on a first substrate different from the sensor substrate, wherein the controller is electrically coupled to the working electrode and the reference electrode via the first and the second conductive pads, respectively, wherein the controller is electrically connected to the first conductive connection pad via the interconnect, and wherein the first substrate is at least partially embedded in a polymeric material, wherein the polymeric material has a shape that includes a mounting surface formed to be mounted to an external body surface; and measuring the amperometric current using the controller.
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Specification