Layered Implantable Sensor for Analyte Detection

The patent applies dimensionality change by transitioning from a planar electrode arrangement to a three-dimensional layered structure. Multiple electrode pairs are stacked at different heights (Z-dimension) on the carrier substrate, allowing electrodes to overlap in the planar view while being separated vertically. This spatial arrangement maintains electrical insulation through vertical separation while enabling analyte access through the interstitial spaces between layers, effectively resolving the contradiction between insulation and accessibility.

The patent segments the electrode structure into multiple independent layers, with each layer containing electrode pairs separated by insulating material. This segmentation allows each electrode pair to be electrically isolated while collectively providing multiple measurement sites. The insulating layers between electrode planes further segment the conductive paths, ensuring electrical isolation while maintaining analyte diffusion pathways through the segmented structure.

The patent extracts the complex lithographic structuring step from the manufacturing process by using simple geometric electrode shapes (e.g., interdigitated comb structures) that can be fabricated using basic photolithography or even direct printing methods. The precision required is achieved through the straightforward geometric design rather than complex patterning, eliminating the need for advanced lithographic techniques while maintaining adequate manufacturing precision.

The patent changes the geometric parameters of the electrode structures to simple, repeatable patterns such as parallel lines or combs with uniform spacing. These parameter-based designs allow for precise fabrication using standard manufacturing tolerances without requiring complex lithographic processes. The uniform spacing and simple shapes enable precise electrode positioning through conventional manufacturing methods.

The patent removes the capillary component entirely from the sensor design. Instead of using a capillary to transport fluid, the electrodes are directly exposed to the body fluid through the carrier substrate interface. This extraction of the capillary eliminates the diffusion barrier it created, allowing analytes to access the electrodes directly while maintaining fluid flow control through the natural convection and diffusion processes in the tissue interface.

The patent transitions from one-dimensional fluid transport through a capillary channel to three-dimensional direct contact between the electrodes and body fluid. The electrodes are arranged in multiple layers with exposed surfaces that interface directly with the fluid, enabling analyte access from multiple directions simultaneously. This dimensional change eliminates the restrictive single-path diffusion through a capillary while maintaining effective fluid interaction.