Tear fluid conductivity sensor
First Claim
1. An eye-mountable device comprising:
- a transparent polymeric material;
a substrate at least partially embedded within the polymeric material;
an antenna disposed on the substrate;
a conductivity sensor disposed on the substrate, wherein the conductivity sensor includes;
a frame having a trench formed therein that defines a fluid sample cell, wherein the trench includes a first sidewall and a second sidewall,a first electrode formed on the first sidewall, anda second electrode formed on the second sidewall such that the first and second electrodes are on opposite sides of the fluid sample cell; and
a controller electrically connected to the sensor electrodes and the antenna, wherein the controller is configured to;
(i) apply a voltage to the electrodes sufficient to generate a current through the electrodes related to a conductance of a fluid occupying the fluid sample cell;
(ii) measure the generated current; and
(iii) use the antenna to indicate the measured current.
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Accused Products
Abstract
Disclosed herein is a fluid conductivity sensor that can be used to obtain in-vivo measurements of conductivity of biological fluid samples, for example, to determine osmolarity. The conductivity sensor can be disposed on a substrate that is at least partially embedded within a polymeric material of a body-mountable device. The conductivity sensor can include a frame having a trench formed therein that defines a fluid sample cell. First and second electrodes can be formed on sidewalls of the trench, such that the first and second electrodes are on opposite sides of the fluid sample cell. A controller in the body-mountable device can operate the sensor by applying a voltage to the electrodes and measuring a current through a fluid occupying the fluid sample cell. The body-mountable device may indicate the current measurements wirelessly using an antenna.
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Citations
14 Claims
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1. An eye-mountable device comprising:
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a transparent polymeric material; a substrate at least partially embedded within the polymeric material; an antenna disposed on the substrate; a conductivity sensor disposed on the substrate, wherein the conductivity sensor includes; a frame having a trench formed therein that defines a fluid sample cell, wherein the trench includes a first sidewall and a second sidewall, a first electrode formed on the first sidewall, and a second electrode formed on the second sidewall such that the first and second electrodes are on opposite sides of the fluid sample cell; and a controller electrically connected to the sensor electrodes and the antenna, wherein the controller is configured to;
(i) apply a voltage to the electrodes sufficient to generate a current through the electrodes related to a conductance of a fluid occupying the fluid sample cell;
(ii) measure the generated current; and
(iii) use the antenna to indicate the measured current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification