Breath sampling devices and methods of breath sampling using sensors

1. A breath sampling device comprising:

a housing having a fluid inlet positioned at a fluid inlet end, a fluid outlet positioned at a fluid outlet end, and a fluid channel extending between the fluid inlet and the fluid outlet;

a sensor fluidly coupled to the fluid channel, wherein the sensor is structurally configured to detect a presence of a target gas in a gas sample; and

a filter assembly fluidly coupled to the fluid channel and positioned between the fluid inlet and the sensor, wherein the filter assembly is structurally configured to reduce the heat of the gas sample and reduce the humidity of the gas sample and the filter assembly comprises a heat dissipation shield comprising a thermally conductive metal having an array of holes, wherein the heat dissipation shield is fluidly coupled to the fluid channel such that a portion of the gas sample introduced into the fluid channel passes through the array of holes and wherein the heat dissipation shield is positioned relative to the sensor such that the gas sample comprises a higher temperature when the gas sample contacts the filter assembly than when the gas sample contacts the sensor.

2. The breath sampling device of claim 1 , wherein the filter assembly comprises a humidity shield structurally configured to reduce humidity of the gas sample upon contact between the gas sample and the humidity shield.

3. The breath sampling device of claim 2 , wherein the humidity shield comprises a sulfonated tetra fluoroethylene based fluoropolymer-copolymer, porous polypyrrole, glycerol, room temperature ionic liquid, polyvinyl alcohol, humectant, or a combination thereof.

4. The breath sampling device of claim 2 , wherein the humidity shield retains the humidity removed from the gas sample for a buffering period.

5. The breath sampling device of claim 1 , wherein the housing comprises a chemically inert plastic.

6. The breath sampling device of claim 1 , wherein the fluid inlet comprises a first cross sectional area and the fluid outlet comprises a second cross sectional area, wherein the first cross sectional area is smaller than the second cross sectional area.

7. The breath sampling device of claim 1 , wherein the sensor is a printed gas sensor comprising:

a substrate layer comprising one or more gas access regions;

one or more printed runners coupled to the substrate layer, wherein the one or more printed runners are electrically conductive;

an encapsulation layer coupled to the substrate layer and defining an electrolyte cavity positioned within the encapsulation layer;

one or more electrodes positioned in electrical communication with the one or more printed runners such that the one or more printed runners can transport an electronic signal produced by an electrochemical reaction at the one or more electrodes; and

an electrolyte housed within the electrolyte cavity.

8. The breath sampling device of claim 1 , wherein the heat dissipation shield is positioned relative to the sensor such that the gas sample comprises a higher temperature when the gas sample contacts the filter assembly than when the gas sample undergoes an electrochemical reaction within the sensor.

9. A breath sampling device comprising:

a housing having a fluid inlet positioned at a fluid inlet end, a fluid outlet positioned at a fluid outlet end, and a fluid channel extending between the fluid inlet and the fluid outlet;

a printed gas sensor fluidly coupled to the fluid channel, wherein the printed gas sensor is structurally configured to detect a presence of a target gas in a gas sample; and

a heat dissipation shield fluidly coupled to the fluid channel and positioned in a fluid flow path upstream of the printed gas sensor, wherein the heat dissipation shield comprises a thermally conductive metal having an array of holes, wherein the heat dissipation shield is fluidly coupled to the fluid channel such that a portion of the gas sample introduced into the fluid channel passes through the array of holes, and wherein, upon contact between the gas sample and the heat dissipation shield, the heat dissipation shield reduces the heat of the gas sample and the heat dissipation shield is positioned relative to the printed gas sensor such that the gas sample comprises a higher temperature when the gas sample contacts the heat dissipation shield than when the gas sample contacts the printed gas sensor.

10. The breath sampling device of claim 9 , wherein the printed gas sensor is operable at a temperature between 15° C. and 30° C.

11. A breath sampling device comprising:

a housing having a fluid inlet positioned at a fluid inlet end, a fluid outlet positioned at a fluid outlet end, and a fluid channel extending between the fluid inlet and the fluid outlet;

a printed gas sensor fluidly coupled to the fluid channel, wherein the printed gas sensor is structurally configured to detect a presence of a target gas in a gas sample;

a humidity shield fluidly coupled to the fluid channel and positioned in a fluid flow path upstream of the printed gas sensor, wherein, upon contact between the gas sample and the humidity shield, the humidity shield reduces the humidity of the gas sample; and

a heat dissipation shield fluidly coupled to the fluid channel and positioned in the fluid flow path upstream of the printed gas sensor, wherein the heat dissipation shield comprises a thermally conductive metal having an array of holes, wherein the heat dissipation shield is fluidly coupled to the fluid channel such that a portion of the gas sample introduced into the fluid channel passes through the array of holes, and wherein, upon contact between the gas sample and the heat dissipation shield, the heat dissipation shield reduces the heat of the gas sample and the heat dissipation shield is positioned relative to the printed gas sensor such that the gas sample comprises a higher temperature when the gas sample contacts the heat dissipation shield than when the gas sample contacts the printed gas sensor.

12. The breath sampling device of claim 11 , wherein the humidity shield comprises a sulfonated tetra fluoroethylene based fluoropolymer-copolymer, porous polypyrrole, glycerol, room temperature ionic liquid, polyvinyl alcohol, humectant, or a combination thereof.

13. The breath sampling device of claim 11 , wherein the humidity shield retains the humidity removed from the gas sample for a buffering period.

14. The breath sampling device of claim 11 , wherein the heat dissipation shield is positioned relative to the printed gas sensor such that the gas sample comprises a temperature of less than 40° C. when the gas sample undergoes an electrochemical reaction within the printed gas sensor.