The design of the paper sensor

PROBLEM TO BE SOLVED: To provide a biomedical paper sensor which can determine the concentration of biological materials in fluids such as blood, urine, and saliva.SOLUTION: A sensor 100 contains a plurality of axially radiating test zones 130, 131, 132, 133, 134, each test zone separated from the other test zones by wax ink barriers formed by a process that produces thin walls. Each test zone can contain a unique test reagent, or a unique concentration of a test reagent, and can also be identified by printed text. The region of the device outside the test zone is printed with a uniform reference color.SELECTED DRAWING: Figure 3