Wearable Interface Design Using Tissue Viscoelastic Mapping

The patent applies local quality by creating a mechanical interface with spatially varying material properties that match the locally varying viscoelastic characteristics of different body tissue regions. The fabrication process uses 3D printed layers with different material compositions and mechanical properties to represent the heterogeneous nature of underlying anatomy, allowing each region of the interface to have optimized properties for its specific location rather than using homogeneous materials throughout.

The patent employs composite materials by combining multiple materials with different viscoelastic properties within a single mechanical interface structure. The 3D printing process integrates layers of materials with varying stiffness, damping, and elasticity characteristics to create a composite structure that mimics the complex, multi-tissue nature of the body, enabling the interface to simultaneously provide support in rigid regions and compliance in soft tissue regions.

The patent applies parameter changes by systematically varying material properties (viscoelasticity, stiffness, damping) across different regions and layers of the mechanical interface during fabrication. The 3D printing process enables continuous adjustment of material parameters to match the spatially varying characteristics of underlying tissues, allowing the interface to adapt to the multi-tissue nature of the anatomy rather than requiring a single homogeneous material property throughout.

The patent incorporates dynamics by designing the mechanical interface to exhibit time-dependent, rate-sensitive mechanical behavior that mirrors the viscoelastic nature of biological tissues. The interface materials and structure are engineered to display different mechanical responses under varying load rates and deformation conditions, enabling dynamic adaptation to the living, moving body rather than maintaining static, fixed properties.

The patent applies local quality by providing rigid structural support only in specific regions where mechanical strength is required, while incorporating compliant, softer materials in regions that contact sensitive skin areas. This spatial differentiation allows the interface to simultaneously achieve the necessary structural integrity for load-bearing functions and the surface compliance needed to minimize excessive pressures and prevent skin chafing in different locations.

The patent uses composite materials to combine rigid structural components with compliant surface layers, creating a multi-material interface that delivers both strength and comfort. The composite structure allows rigid materials to provide skeletal support and load transfer while softer materials interface with the skin to distribute pressures and reduce friction, eliminating the need to choose between strength and comfort.