Derivative works — US Patent 12409014B2

Defensive Disclosure and Prior Art Enhancement

Publication Date: April 26, 2026
Subject: Derivative Embodiments and Applications of Additively Manufactured Structures with Patient-Specific Geometries and Controlled Failure Modes
Reference Technology: US Patent 12,409,014 B2

This document serves to disclose and place into the public domain a series of derivative inventions, applications, and modifications related to the core teachings of US Patent 12,409,014 B2. The intent is to establish prior art for subsequent innovations and to foster unrestricted development in the fields of patient-specific medical devices, advanced manufacturing, and materials science.

Section 1: Material & Component Substitution Derivatives

1.1 Bioresorbable Composite Bracket

Enabling Description: An orthodontic bracket is manufactured from a composite material comprising a bioresorbable polymer matrix, such as polylactic-co-glycolic acid (PLGA), reinforced with micron-sized particles of hydroxyapatite (HA) or tricalcium phosphate (TCP). The ratio of polymer to ceramic reinforcement is functionally graded throughout the bracket's volume. A higher concentration of ceramic (e.g., 60% by weight) is used in the main body and archwire slot for structural integrity, while a lower concentration (e.g., 20% by weight) is used in the fracture wall and fracture groove regions to promote controlled resorption and debonding. The degradation rate is engineered such that the bracket maintains structural integrity for a typical 18-24 month treatment period, after which the weakened fracture zones can be cleaved with minimal force, or the bracket can be left to resorb completely over an additional 6-12 months. The manufacturing process utilizes a slurry-based AM method where two distinct slurries (one polymer-rich, one ceramic-rich) are selectively deposited or co-extruded layer-by-layer.

Mermaid.js Diagram:

graph TD
    subgraph Bracket Volume
        A[Main Body & Slot - 60% HA/TCP] -->|Functionally Graded Interface| B(Fracture Wall & Groove - 20% HA/TCP);
        A --> C{Archwire Force Transmission};
        B --> D{Controlled Resorption & Debonding};
    end
    subgraph Manufacturing
        S1[Slurry 1: PLGA + High HA] -- Selective Deposition --> P(AM Build Plate);
        S2[Slurry 2: PLGA + Low HA] -- Selective Deposition --> P;
    end
    P --> FinalBracket[Bioresorbable Composite Bracket];

1.2 Shape-Memory Alloy (Nitinol) Lattice Bracket

Enabling Description: The bracket body is fabricated not as a solid ceramic but as a micro-lattice structure using selective laser melting (SLM) of a shape-memory alloy (SMA) powder, specifically nickel-titanium (Nitinol). The base of the bracket, contoured to the tooth, is a dense SMA structure for bonding. The main body, including the tie-wings, is a porous lattice with a designed porosity of 40-60%. The archwire slot is a solid, polished channel. The "fracture groove" is replaced by a "phase-transition seam," a specific region of the lattice designed to undergo a stress-induced martensitic phase transformation at a predetermined force (e.g., 100 Newtons). This localized phase change absorbs energy and allows the bracket to deform controllably for debonding. The bracket can be returned to its original shape by applying heat (austenitic phase), allowing for potential re-bracketing.

Mermaid.js Diagram:

stateDiagram-v2
    [*] --> Austenitic_State: Default (High Temp)
    Austenitic_State --> Martensitic_State: Apply Debonding Force (>100N) at Seam
    Martensitic_State --> Austenitic_State: Apply Heat (e.g., 60°C)
    Martensitic_State: Bracket deforms for removal
    Austenitic_State: Rigid bracket for treatment

1.3 Piezoelectric Ceramic Bracket for Micro-Vibration Therapy

Enabling Description: The bracket is additively manufactured from a piezoelectric ceramic material, such as barium titanate (BaTiO3) or lead zirconate titanate (PZT), mixed within a biocompatible polymer binder. Two micro-conductors are embedded during the printing process, terminating at an external contact point on the bracket face. When connected to a low-voltage, high-frequency power source (e.g., a removable intraoral device), the bracket material vibrates at a controlled ultrasonic frequency (20-50 kHz). This micro-vibration is intended to stimulate cellular activity (osteoblasts and osteoclasts) at the tooth root, potentially accelerating orthodontic tooth movement. The custom-contoured base ensures efficient mechanical coupling and energy transfer from the bracket to the tooth. The fracture features are retained for safe debonding.

Mermaid.js Diagram:

sequenceDiagram
    participant PowerSource
    participant Bracket
    participant Tooth
    PowerSource->>+Bracket: Apply AC Voltage (20-50 kHz)
    Bracket->>Bracket: Piezoelectric effect induces vibration
    Bracket->>+Tooth: Transfer mechanical energy
    Tooth->>Tooth: Stimulate cellular response
    deactivate Bracket
    deactivate Tooth

Section 2: Operational Parameter Expansion Derivatives

2.1 Nanoscale Drug-Eluting Bracket

Enabling Description: A standard ceramic bracket (e.g., ZTA) is fabricated with an internal, interconnected network of nano-porosity (100-500 nm pore size). This is achieved by including a volatile, nano-particulate sacrificial material in the initial ceramic slurry, which is burned out during the sintering phase. Post-sintering, the porous bracket is vacuum-infiltrated with a therapeutic agent, such as a non-steroidal anti-inflammatory drug (NSAID) for pain management or a fluoride-releasing compound to prevent demineralization. The nano-porous structure provides a large surface area for a high drug load and allows for sustained, controlled diffusion of the agent into the oral environment over a period of 1-3 months. The drug elution rate is controlled by the tortuosity and pore size of the network, designed via the AM process.

Mermaid.js Diagram:

graph LR
    A[Ceramic Slurry + Sacrificial Nanoparticles] --> B{Additive Manufacturing};
    B --> C[Green Part];
    C --> D{Sintering & Burnout};
    D --> E[Nanoporous Bracket];
    F[Therapeutic Agent] --> G{Vacuum Infiltration};
    E --> G;
    G --> H[Drug-Eluting Bracket];
    H --> I((Sustained Release));

2.2 Large-Scale Architectural Facade Panel with Controlled Breakaway Points

Enabling Description: The method of designing a custom-contoured base with integrated fracture grooves is scaled up for architectural applications. Large facade panels (e.g., 2m x 5m) are manufactured from fiber-reinforced concrete or polymer composite using large-format additive manufacturing (e.g., robotic arm extrusion). Each panel's mounting surface is custom-contoured to match a 3D scan of the building's structural frame, ensuring a perfect fit with minimal shimming. Integrated "fracture grooves" and thin "fracture walls" are designed into the panel's structure at attachment points. In the event of a seismic event or high wind load exceeding a design threshold, these features allow the panel to break away from the structure in a predictable manner, preventing catastrophic failure of the underlying frame.

Mermaid.js Diagram:

flowchart TD
    subgraph Design
        A[3D Scan of Building Frame] --> B[CAD Model of Panel];
        B --> C[Define Contoured Base & Fracture Grooves];
    end
    subgraph Manufacturing
        D[Robotic Arm Extrusion] --> E[Facade Panel];
    end
    subgraph Operation
        F[Seismic/Wind Load] --> G{Threshold Exceeded?};
        G -- Yes --> H[Fracture at Grooves];
        H --> I[Panel Breaks Away Safely];
        G -- No --> J[Panel Remains Attached];
    end
    C --> D;
    E --> F;

Section 3: Cross-Domain Application Derivatives

3.1 (Aerospace) Custom-Contoured, Frangible Mounts for Satellite Components

Enabling Description: A mounting bracket for sensitive satellite components (e.g., sensors, antennas) is additively manufactured from a low-outgassing polymer like PEEK or a lightweight aluminum-scandium alloy. The base of the mount is custom-contoured to the non-uniform surface of the satellite's internal structure or honeycomb panel, as determined by a pre-flight 3D scan. This ensures a stress-free, perfect-fit mounting. The bracket incorporates a "fracture wall" feature designed to fail at a precise shock load (G-force), such as that experienced during stage separation or deployment. This allows the component to detach cleanly if a deployment fails or if jettisoning is required, preventing collateral damage to other systems. The part's design, including its unique contour and fracture properties, is generated from a digital twin of the satellite.

Mermaid.js Diagram:

classDiagram
    class SatelliteComponent {
        +componentID
        +mass
        +shockTolerance
    }
    class MountingBracket {
        +material: PEEK
        +customContourData
        +fractureLoad_G
        +designFromDigitalTwin()
    }
    class SatelliteStructure {
        +surfaceTopologyData
    }
    SatelliteStructure "1" -- "1..*" MountingBracket : mountsOn
    MountingBracket "1" -- "1" SatelliteComponent : holds

3.2 (AgTech) Biocompatible, Contoured Sensor Mounts for Animal Husbandry

Enabling Description: A device for attaching a biometric sensor (e.g., temperature, pH, movement) to livestock, such as a cow's ear or a fish's dorsal fin. The mount is 3D printed from a biocompatible, flexible TPU (thermoplastic polyurethane). The base is custom-contoured to the animal's specific anatomy, derived from a 3D scan, to ensure a comfortable, secure fit that minimizes irritation and tissue damage. It incorporates a "fracture groove" designed to break under a specific tensile load (e.g., 50 Newtons) if the sensor gets snagged on a fence or equipment. This ensures the animal can break free without injury, sacrificing the sensor but protecting the animal. The retentive structures are replaced with a non-adhesive, micro-textured surface that provides grip without requiring bonding cement.

Mermaid.js Diagram:

graph TD
    A[3D Scan of Animal] --> B[Generate Custom Contour];
    B --> C[Print TPU Mount];
    D[Biometric Sensor] --> E{Assemble};
    C --> E;
    E --> F[Attach to Animal];
    F --> G{Snag Event};
    G -- Load > 50N --> H[Fracture Groove Fails];
    H --> I[Sensor Detaches, Animal is Safe];
    G -- Load < 50N --> J[Remains Attached];

Section 4: Integration with Emerging Tech Derivatives

4.1 (AI Integration) AI-Driven Generative Design of Fracture Geometries

Enabling Description: An AI/Machine Learning model is trained to optimize the geometry of the fracture groove, fracture wall, and retentive structures. The input to the model includes the 3D model of the tooth (or other substrate), the material properties of the bracket (e.g., ceramic elastic modulus, fracture toughness), and desired performance parameters (e.g., target debonding force in Newtons, required shear bond strength in megapascals). The AI, using a generative adversarial network (GAN) or topology optimization algorithm, iteratively designs and simulates thousands of micro-geometric patterns. The output is a final, optimized 3D CAD model of the bracket base with non-obvious and highly efficient fracture and retention features that are superior to human-designed patterns.

Mermaid.js Diagram:

sequenceDiagram
    participant User
    participant AI_Model
    participant SimulationEngine
    participant CAD_Output
    User->>AI_Model: Input(Tooth Geometry, Material Props, Target Forces)
    loop Generative Loop
        AI_Model->>SimulationEngine: Propose Base Geometry (Groove, Retentions)
        SimulationEngine->>SimulationEngine: Run Finite Element Analysis (FEA)
        SimulationEngine-->>AI_Model: Return Performance Metrics (Stress, Strain)
    end
    AI_Model->>CAD_Output: Export Optimized Bracket Base Model

4.2 (IoT Integration) IoT-Enabled Bracket with Integrated Strain Gauge Sensor

Enabling Description: A micro-thin film strain gauge is embedded within the orthodontic bracket during the additive manufacturing process. The strain gauge is positioned at the interface between the bracket base and body. A miniaturized Bluetooth Low Energy (BLE) chipset and a micro-battery are also encapsulated within the bracket body. The strain gauge continuously monitors the forces exerted by the archwire and transmitted to the tooth. This data is transmitted wirelessly to a patient's smartphone app, providing the orthodontist with real-time, quantitative data on treatment progression. The data can flag a loss of force (e.g., wire fatigue) or excessive force, enabling more precise and timely adjustments. The fracture groove is designed to sever the sensor's connection upon debonding, deactivating the device.

Mermaid.js Diagram:

flowchart LR
    subgraph Bracket
        A[Archwire Force] --> B[Strain Gauge];
        B --> C[BLE Chipset];
    end
    subgraph External
        D[Smartphone App] --> E[Cloud Database];
        E --> F[Orthodontist Portal];
    end
    C -- Wireless Data --> D;

Section 5: The "Inverse" or Failure Mode Derivatives

5.1 Safe-Fail Bracket with Color-Changing Polymer Indicating Stress-Fracture Initiation

Enabling Description: The bracket is manufactured from a translucent ceramic composite containing a mechanochromic (piezoresistive) polymer additive. This additive consists of microcapsules containing a colored dye that are designed to rupture under specific strain levels. If the bracket is subjected to an excessive, potentially damaging force (e.g., from a blow to the mouth or improper handling), the strain in the material will exceed the elastic limit, particularly around the pre-scored fracture groove. This ruptures the microcapsules, releasing the dye and causing a visible, permanent color change (e.g., from clear to red) in the high-strain areas. This provides an immediate visual indication to the patient and clinician that the bracket's integrity has been compromised and it needs to be inspected or replaced, even if no macroscopic fracture is visible. This represents a safe-fail mechanism, signaling failure before complete separation.

Mermaid.js Diagram:

stateDiagram-v2
    [*] --> Normal_State
    Normal_State: Bracket is Translucent
    Normal_State --> Compromised_State: Apply Excessive Force/Strain
    Compromised_State: Color change appears at fracture groove
    Compromised_State --> Fractured_State: Continued Force
    note right of Compromised_State
        Mechanochromic microcapsules
        rupture, releasing dye.
    end note

Section 6: Combination with Open-Source Standards

6.1 Combination with DICOM and 3D Slicer: The process of creating the patient-specific device begins by importing raw imaging data from a Cone Beam Computed Tomography (CBCT) scan, formatted according to the DICOM (Digital Imaging and Communications in Medicine) standard (ISO 12052). This DICOM data is then processed using an open-source medical imaging platform, such as 3D Slicer, to segment the dental and bone anatomy. The resulting 3D mesh model (e.g., in .STL or .OBJ format) serves as the direct input for the CAD design process of the custom-contoured bracket base, ensuring interoperability with standard clinical imaging workflows.
6.2 Combination with glTF for Web-Based Visualization: The final patient-specific 3D CAD bracket model, along with the planned placement on the tooth model, is exported using the glTF (GL Transmission Format) open-source standard. This royalty-free format is optimized for efficient transmission and loading of 3D scenes and models by web applications. This enables orthodontists and patients to view and approve the proposed digital treatment plan in a web browser or on a mobile device without requiring specialized proprietary software, leveraging open web standards like WebGL.
6.3 Combination with OPC UA for Manufacturing Data Exchange: The manufacturing instructions for the additive manufacturing machine are communicated using the OPC Unified Architecture (OPC UA) open-source machine-to-machine communication protocol for industrial automation. The generated manufacturing control data, including sliced layer information, material parameters, and compensation angles, are encapsulated in an OPC UA data model. This allows the central design server to communicate directly and securely with a diverse range of 3D printers from different vendors that support the OPC UA standard, creating a platform-agnostic manufacturing ecosystem.